Typical CSS Configuration of Modular Switches

S300, S500, S2700, S3700, S5700, S6700, S7700, and S9700 Series Switches Typical Configuration Examples(V100 and V200)

This document provides campus networks typical configuration examples and feature typical configuration examples. "Campus Networks Typical Configuration Examples" provides typical campus network networking modes and a variety of deployment examples."Feature Typical Configuration Examples" provides typical configuration examples of a single feature on a switch. You can configure required features after deploying a campus network.

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Typical CSS Configuration of Modular Switches

CSS Support
Example for Setting Up a CSS of Two Member Switches Using CSS Cards
Example for Setting Up a CSS Using Service Ports
Combining Standalone Switches into a CSS

CSS Support

CSS Version Requirements

Table 3-11 Products and versions supporting CSS

Product	Product Model	Version Supporting CSS Card Clustering	Version Supporting Service Port Clustering
S7700	S7703 S7703 PoE	Not supported	Not supported
	S7706 S7712	V200R001(C00&C10), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10, V200R020C00, V200R020C10, V200R021C00, V200R021C01	V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00, V200R013C02, V200R019C00, V200R019C10, V200R020C00, V200R020C10, V200R021C00, V200R021C01
	S7706 PoE	V200R013C00, V200R019C00, V200R019C10, V200R020C00, V200R020C10, V200R021C00, V200R021C01	V200R013C00, V200R019C00, V200R019C10, V200R020C00, V200R020C10, V200R021C00, V200R021C01
S9700	S9703	Not supported	Not supported
S9700	S9706 S9712	V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00	V200R001C01, V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

Software and Hardware Support for S7700 CSS Card Clustering

Table 3-12 Software and Hardware Support for S7706&S7706 PoE&S7712 CSS Card Clustering

Device Model	S7706 S7706 PoE S7712
CSS Card and Installation Slot	CSS card: ES02VSTSA (All ports on the CSS cards must be connected.) Installation slot: subcard slots of ES1D2SRUAC00, ES0D00SRUA00 (non-VER.A) and ES0D00SRUB00 (non-VER.A) _{CSS card and MPU models are abbreviated to VSTSA, SRUA, and SRUB respectively.}	CSS card: ES1D2VS04000 (CSS ports on the CSS cards must have at least one cable connected and ports on both ends of the cable must use the same port number.) Installation slot: subcard slots of LSS7SRUHA100, ES1D2SRUH000, LSS7SRUHD000, ES1D2SRUH002, LSS7SRUH1000, LSS7SRUE1000, LSS7SRUED000, and ES1D2SRUE000 _{CSS card and MPU models are abbreviated to VS04, SRUHA1, SRUH, SRUHD, SRUH1, SRUE1, SRUED, and SRUE respectively.}
Hot Swap of CSS Cards	Not supported	Supported
Number of CSS Cards Supported by Each Chassis	2	2
Number of CSS Ports on Each CSS Card and Bandwidth of a Single CSS Port	Four 16G ports	Four 10G ports
Pluggable Modules for Ports on CSS Cards	3 m and 10 m QSFP+ high-speed cable QSFP+ optical module (only QSFP-40G-SR4, QSFP-40G-iSR4, and QSFP-40G-eSR4) and fiber 10 m QSFP+ AOC cable (supported since V200R010C00) 5 m QSFP+ high-speed cable (supported since V200R011C10) NOTE: 1-to-4 QSFP+ high-speed cable, 1-to-4 QSFP+ AOC cable, and QSFP+ optical modules that connect a 40GE port to four 10GE ports using a 1-to-4 cable do not support CSS.	1 m, 3 m, 5 m, and 10 m SFP+ high-speed cable SFP+ optical module and fiber 3 m and 10 m SFP+ AOC cable
Hardware Configuration	Two S7706s, two S7706 PoEs, two S7712s, one S7706 and one S7712, one S7706 PoE and one S7706, or one S7706 PoE and one S7712 can set up a CSS. Each chassis must have both active and standby MPUs installed, and the two MPUs must have stack cards installed. SRUs in the same chassis must be the same model. To set up a stack, the local and remote chassis must use SRUs of the same model or use SRUA and SRUB respectively.	Two S7706s, two S7706 PoEs, two S7712s, one S7706 and one S7712, one S7706 PoE and one S7706, or one S7706 PoE and one S7712 can set up a CSS. Each chassis can have only one SRU installed, and a CSS card can be installed in any MPU slot. To ensure reliability, you are advised to install two MPUs in each chassis. SRUs in the same chassis must be the same model. To set up a stack, the local and remote chassis must use SRUs of the same model or use SRUH and SRUE respectively(both chassis must run V200R010C00 or a later version), or use SRUH1 and SRUE respectively, or use SRUH and SRUH1 respectively.
License Required	No

Software and Hardware Support for S9700 CSS Card Clustering

Device Model	S9706 S9712
CSS Card and Installation Slot	CSS card: EH1D2VS08000 (Eight ports on a CSS card are divided into two groups, each of which must have at least one cable connected.) Installation slot: subcard slot of EH1D2SRUC000 _{CSS card and MPU models are abbreviated to VS08 and SRUC respectively.}
Hot Swap of CSS Cards	Not supported
Number of CSS Cards Supported by Each Chassis	2
Number of CSS Ports on Each CSS Card and Bandwidth of a Single CSS Port	Eight 10G ports
Pluggable Modules for Ports on CSS Cards	1 m, 3 m, 5 m, and 10 m SFP+ high-speed cable SFP+ optical module and fiber 3 m and 10 m SFP+ AOC cable
Hardware Configuration	Two S9706s, one S9706 and one S9712, or two S9712s can set up a CSS. Switches to set up a CSS must have both active and standby MPUs installed, and the two MPUs must have stack cards installed.
License Required	No

Software and Hardware Support for S7700 Service Port Clustering

Only two S7706 switches, two S7706 PoE switches, two S7712 switches, one S7706 and one S7706 PoE, one S7706 and one S7712, or one S7706 PoE and one S7712 can set up a CSS.
SRUs in the same chassis must be the same model. To set up a stack, the local and remote chassis must use SRUs of the same model, use SRUA and SRUB respectively, or use SRUH and SRUE respectively, or use SRUH1 and SRUE respectively, or use SRUH1 and SRUE1 respectively, or use SRUH and SRUE1 respectively, or use SRUE and SRUE1 respectively, or use SRUH and SRUH1 respectively(both chassis must run V200R010C00 or a later version).
Each chassis can have at most two LPUs for CSS connection. It is recommended that you use the same type of LPUs in a chassis for CSS connection. The two chassis must use the same type of ports for CSS connection, for example, 10GE SFP+ optical ports.
Each LPU allows only one logical CSS port. Each logical CSS port supports a maximum of 32 physical member ports.
Some ports on an LPU can function as CSS ports, while other ports on the LPU function as service ports.
A CSS can be set up as long as a logical CSS port has one CSS member port in Up state.
Ports do not support the CSS function after being split.
S7700 service port clustering is not under license control.

MPU model	LPU Model	Pluggable Modules on Service Ports	Usage Constraints
SRUA/SRUB/SRUE/SRUE1/SRUH/SRUH1/SRUHA1	ES1D2X08SED4 ES1D2X08SED5 ES0D0X12SA00 ES0D0X12SA01 ES1D2X16SFC0 ES1D2X40SFC0 ES1D2X32SSC0 ES1D2X16SSC2	1 m, 3 m, 5 m, and 10 m SFP+ high-speed cable SFP+ optical module and fiber 3 m and 10 m SFP+ AOC cable NOTE: The ES0D0X12SA00 and ES0D0X12SA01 do not support 3 m and 5 m SFP+ high-speed cables.	On the ES1D2X08SED4 and ES0D0X12SA00 LPUs, at most four ports can be configured as CSS physical member ports. The four physical member ports must be the first four ports (numbered 0 to 3) or the last four ports (numbered 4 to 7) on the LPUs. On the ES1D2X16SFC0, ES1D2X40SFC0, ES1D2X32SSC0, and ES1D2X16SSC2 LPUs, four contiguous ports must be configured as a group of physical member ports together. The port numbers of the four ports must start with 4xN and end with 4xN+3 (N = 0, 1, 2...). For example, ports 0 to 3 or ports 4 to 7 must be configured together, but ports 2 to 5 cannot be configured together. If any port in a group is configured as a physical member port, the other three ports of the same group must also be configured as physical member ports.
SRUA/SRUB/SRUE/SRUE1/SRUH/SRUH1/SRUHA1	ES1D2L02QFC0	1 m, 3 m, and 5 m QSFP+ high-speed cable QSFP+ optical module and fiber (QSFP-40G-SR-BD optical modules can be used for CSS since V200R019C10SPC500.) 10 m QSFP+ AOC cable (supported since V200R009C00)	None
SRUHX1	LSS7X24BX6E0 LSS7X24BX6S0 LSS7X48SX6E0 LSS7X48SX6S0	1 m, 3 m, 5 m, and 10 m SFP+ high-speed cable SFP+ optical module and fiber 3 m and 10 m SFP+ AOC cable	The SRUHX1 is available in V200R019C10 and later versions.
	LSS7C02BX6E0 (40GE ports) LSS7L12QX6E0	QSFP+ optical module and fiber 10 m QSFP+ AOC cable
	LSS7C06HX6S0 LSS7C06HX6E0 LSS7C02BX6E0 (100GE ports)	1 m and 3 m QSFP28 high-speed cable QSFP28 optical module and fiber 10 m QSFP28 AOC cable
	LSS7M24VX6E1 (MultiGE ports) LSS7M24VX6S1 (MultiGE ports) LSS7M24BX6E0 (MultiGE ports) LSS7M24BX6S0 (MultiGE ports)	Category 6A or higher network cables (If Category 6 cables are used, ensure that the cables meet requirements of TSB-155.)	The SRUHX1 is available in V200R021C00 and later versions.

Software and Hardware Support for S9700 Service Port Clustering

Device Model	S9706 S9712
Service Card Model NOTE: For details about service cards, see "Cards" in the Hardware Description of the specific product model.	EH1D2X08SED4 EH1D2X08SED5 EH1D2X12SSA0 EH1D2X16SFC0 EH1D2X40SFC0 EH1D2X32SSC0 EH1D2X16SSC2	EH1D2L02QFC0 EH1D2L08QFC0
Pluggable Modules on Service Ports	1 m, 3 m, 5 m, and 10 m SFP+ high-speed cable SFP+ optical module and fiber 3 m and 10 m SFP+ AOC cable NOTE: The EH1D2X12SSA0 does not support 3 m and 5 m SFP+ high-speed cables.	1 m, 3 m, and 5 m QSFP+ high-speed cable QSFP+ optical module (except the QSFP-40G-SR-BD model) and fiber 10 m QSFP+ AOC cable (supported since V200R009C00)
Usage Constraints	On the EH1D2X08SED4 and EH1D2X08SED5 LPUs, at most four ports can be configured as CSS physical member ports. The four physical member ports must be the first four ports (numbered 0 to 3) or the last four ports (numbered 4 to 7) on the LPUs. On the EH1D2X16SFC0, EH1D2X40SFC0, EH1D2X32SSC0 and EH1D2X16SSC2 LPUs, four contiguous ports must be configured as a group of physical member ports together. The port numbers of the four ports must start with 4xN and end with 4xN+3 (N = 0, 1, 2...). For example, ports 0 to 3 or ports 4 to 7 must be configured together, but ports 2 to 5 cannot be configured together. If any port in a group is configured as a physical member port, the other three ports of the same group must also be configured as physical member ports.	The interconnected CSS physical member ports on the two member switches must be both 40GE ports. XGE ports derived from a 40GE port cannot be added to a logical CSS port.
Hardware Configuration	Only two S9706 switches, two S9712 switches, or one S9706 and one S9712 can set up a CSS. MPUs in one chassis must be the same model. MPUs in the local and peer chassis can be different models but are recommended to be the same model.
Hardware Configuration	Each chassis can have at most two LPUs for CSS connection. It is recommended that you use the same type of LPUs in a chassis for CSS connection. The two chassis must use the same type of ports for CSS connection, for example, 10GE SFP+ optical ports. Each LPU allows only one logical CSS port. Each logical CSS port supports a maximum of 32 physical member ports. Some ports on an LPU can function as CSS ports, while other ports on the LPU function as service ports. A CSS can be set up as long as a logical CSS port has one CSS member port in Up state.
License Required	No

Example for Setting Up a CSS of Two Member Switches Using CSS Cards

Overview of CSS

A Cluster Switch System (CSS), also called a cluster, is a logical switch consisting of two clustering-capable switches. It provides high forwarding performance and high network reliability and scalability, while simplifying network management.

High reliability: Member switches in a CSS work in redundancy mode. Link redundancy can also be implemented between member switches through link aggregation.
High scalability: Switches can set up a CSS to increase the number of ports, bandwidth, and packet processing capabilities.
Simplified configuration and management: After two switches set up a CSS, they are virtualized into one device. You can log in to the CSS from either member switch to configure and manage the entire CSS.

In CSS card connection mode, member switches are connected using CSS cards on MPUs and cluster cables. Compared with the service port connection mode, the CSS card connection mode does not occupy common service ports, is easy to configure, ensures high stability and low latency, but has higher hardware requirements.

After a CSS is set up, you are advised to perform the following configurations:

To simplify network configuration, increase uplink bandwidth, and improve reliability, configure inter-device Eth-Trunks in the CSS, connect downstream devices to the CSS in dual-homing mode, and add uplink and downlink ports of the CSS to the Eth-Trunks.
Configure the multi-active detection (MAD) function in the CSS. Two member switches in a CSS use the same IP address and MAC address (CSS system MAC address). Therefore, after the CSS splits, two CSSs using the same IP address and MAC address exist. To prevent this situation, a mechanism is required to check for IP address and MAC address conflicts after a split. MAD is a CSS split detection protocol that provides split detection, multi-active handling, and fault recovery mechanisms when a CSS splits due to a link failure. This minimizes the impact of a CSS split on services.

MAD can be implemented in direct or relay mode, but these modes cannot be configured simultaneously in a CSS. You can configure MAD in relay mode for a CSS when an inter-device Eth-Trunk is configured in the CSS. The direct mode occupies additional ports, and these ports can only be used for MAD after being connected using common cables. In contrast to the direct mode, the relay mode does not occupy additional ports.

Guidelines

After two switches set up a CSS, the following features cannot be configured in the CSS:
- Synchronous Ethernet clock
- Precision Time Protocol (PTP) (IEEE 1588)
- Web system configuration (In V200R001C00, the web system is not supported. In V200R002C00 and later versions, you can log in to the CSS through the web system to perform configurations.)
When configuring MAD, focus on the differences in the command syntax between V200R002C00 (and earlier versions) and V200R003C00 (and later versions). In V200R002C00 and earlier versions, the split detection function is called dual-active detection (DAD).
Regardless of how many MAD links exist, ports of the standby switch will be shut down and no longer forward service packets as long as the CSS splits.

Networking Requirements

An enterprise needs to build a network that has a reliable core layer and simple structure to facilitate configuration and management.

To meet requirements of the enterprise, core switches SwitchA and SwitchB set up a CSS in CSS card connection mode. SwitchA is the master switch, and SwitchB is the standby switch. Figure 3-41 shows the network topology. Aggregation switches connect to the CSS through Eth-Trunks, and the CSS connects to the upstream network through an Eth-Trunk. In this example, the core switches are the S9706 switches.

Figure 3-41 Setting up a CSS

Configuration Roadmap

The configuration roadmap is as follows:

Install hardware modules on SwitchA and SwitchB.
Set the CSS connection mode on SwitchA and SwitchB and set their CSS IDs to 1 and 2 and CSS priorities to 100 and 10 respectively. These configurations ensure that SwitchA has a higher probability to become the master switch.
Enable the CSS function on SwitchA and then on SwitchB to ensure that SwitchA becomes the master switch.
Check whether a CSS is set up successfully.
Configure uplink and downlink Eth-Trunks for the CSS to improve forwarding bandwidth and reliability.
Configure MAD to minimize the impact of a CSS split on the network.

Procedure

Install hardware modules.
The following describes only the rule for connecting cluster cables between two member switches. If you also need to install MPUs and CSS cards and learn about installation details, see the Switch Cluster Setup Guide.

Select the required connection diagram based on the device model and CSS card model to connect cluster cables.
Figure 3-42 VSTSA CSS card connections (S7706&S7706 PoE&S7712)

Follow these rules when connecting VSTSA CSS cards: Each VSTSA CSS card has four ports. All ports with the same port number and color must be connected, as shown in the preceding figure. For example, port 1 in blue on the left chassis must be connected to port 1 in blue on the right chassis.

The CSS set up using VSTSA CSS cards allows at most one faulty cluster cable.
Figure 3-43 VS04 CSS card connections (S7706&S7706 PoE&S7712)
Follow these rules when connecting VS04 CSS cards:
Each VS04 CSS card has four ports. All ports with the same port number must be connected, as shown in the preceding figure. For example, port 1 in blue on the left chassis must be connected to port 1 in blue on the right chassis. The two chassis can be connected through one cable. However, it is recommended that the two chassis be connected through multiple cables.

Each CSS card on the local chassis can be connected to only one CSS card on the peer chassis.

Configure the CSS connection mode, CSS ID, and CSS priority.

# Configure the CSS function on SwitchA. Retain the default CSS connection mode (CSS card connection) and the default CSS ID 1, and set the CSS priority to 100.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] set css priority 100

# Configure the CSS function on SwitchB. Retain the default CSS connection mode (CSS card connection), and set the CSS ID to 2 and CSS priority to 10.

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] set css id 2
[SwitchB] set css priority 10

# Check the CSS configuration.

After the configuration is complete, run the display css status saved command to check the CSS configuration.

Check the CSS configuration on SwitchA.

[SwitchA] display css status saved
Current Id   Saved Id     CSS Enable   CSS Mode    Priority    Master force     
------------------------------------------------------------------------------  
1            1            Off          CSS card    100         Off

Check the CSS configuration on SwitchB.

[SwitchB] display css status saved
Current Id   Saved Id     CSS Enable   CSS Mode    Priority    Master force     
------------------------------------------------------------------------------  
1            2            Off          CSS card    10          Off

Enable the CSS function.

# Enable the CSS function on SwitchA and restart SwitchA.

[SwitchA] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is CSS card. Reboot now? [Y/N]:y

# Enable the CSS function on SwitchB and restart SwitchB.

[SwitchB] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is CSS card. Reboot now? [Y/N]:y

Check whether a CSS is set up successfully.

# View the indicator status.

The MASTER indicator on a CSS card of SwitchA is steady on, indicating that the MPU with the CSS card installed is the active MPU of the CSS and SwitchA is the master switch.

The MASTER indicators on the CSS cards of SwitchB are off, indicating that SwitchB is the standby switch.

# Log in to the CSS through the console port on any MPU to check whether the CSS has been set up successfully. In versions earlier than V200R005C00, you must log in to the CSS through the console port on the active MPU.

<SwitchA> display device
Chassis 1 (Master Switch)                                                       
S9706's Device status:                                                          
Slot  Sub Type         Online    Power      Register       Status     Role   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   
7     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Master    
      1   EH1D2VS08000 Present   PowerOn    Registered     Normal     NA        
8     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Slave     
      1   EH1D2VS08000 Present   PowerOn    Registered     Normal     NA        
PWR1  -   -            Present   PowerOn    Registered     Normal     NA        
PWR2  -   -            Present   -          Unregistered   -          NA        
CMU2  -   EH1D200CMU00 Present   PowerOn    Registered     Normal     Master    
FAN1  -   -            Present   PowerOn    Registered     Abnormal   NA        
FAN2  -   -            Present   -          Unregistered   -          NA        
Chassis 2 (Standby Switch)                                                      
S9706's Device status:                                                          
Slot  Sub Type         Online    Power      Register       Status     Role   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   
7     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Master    
      1   EH1D2VS08000 Present   PowerOn    Registered     Normal     NA        
8     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Slave     
      1   EH1D2VS08000 Present   PowerOn    Registered     Normal     NA        
PWR1  -   -            Present   PowerOn    Registered     Normal     NA        
PWR2  -   -            Present   PowerOn    Registered     Normal     NA        
CMU1  -   EH1D200CMU00 Present   PowerOn    Registered     Normal     Master    
FAN1  -   -            Present   PowerOn    Registered     Normal     NA        
FAN2  -   -            Present   PowerOn    Registered     Normal     NA

The command output shows the card status of both member switches, indicating that the CSS has been set up successfully.

# Check whether CSS links are normal.

<SwitchA> display css channel
                Chassis 1               ||               Chassis 2              
================================================================================
Num [SRUC HG]    [VS08 Port(Status)]    ||    [VS08 Port(Status)]    [SRUC HG]  
1   1/7  0/12 -- 1/7/0/1(UP 10G)     ---||--- 2/7/0/1(UP 10G)     -- 2/7  0/12  
2   1/7  0/16 -- 1/7/0/2(UP 10G)     ---||--- 2/7/0/2(UP 10G)     -- 2/7  0/16  
3   1/7  0/13 -- 1/7/0/3(UP 10G)     ---||--- 2/7/0/3(UP 10G)     -- 2/7  0/13  
4   1/7  0/17 -- 1/7/0/4(UP 10G)     ---||--- 2/7/0/4(UP 10G)     -- 2/7  0/17  
5   1/7  0/14 -- 1/7/0/5(UP 10G)     ---||--- 2/8/0/5(UP 10G)     -- 2/8  0/14  
6   1/7  0/18 -- 1/7/0/6(UP 10G)     ---||--- 2/8/0/6(UP 10G)     -- 2/8  0/18  
7   1/7  0/15 -- 1/7/0/7(UP 10G)     ---||--- 2/8/0/7(UP 10G)     -- 2/8  0/15  
8   1/7  0/19 -- 1/7/0/8(UP 10G)     ---||--- 2/8/0/8(UP 10G)     -- 2/8  0/19  
9   1/8  0/12 -- 1/8/0/1(UP 10G)     ---||--- 2/8/0/1(UP 10G)     -- 2/8  0/12  
10  1/8  0/16 -- 1/8/0/2(UP 10G)     ---||--- 2/8/0/2(UP 10G)     -- 2/8  0/16  
11  1/8  0/13 -- 1/8/0/3(UP 10G)     ---||--- 2/8/0/3(UP 10G)     -- 2/8  0/13  
12  1/8  0/17 -- 1/8/0/4(UP 10G)     ---||--- 2/8/0/4(UP 10G)     -- 2/8  0/17  
13  1/8  0/14 -- 1/8/0/5(UP 10G)     ---||--- 2/7/0/5(UP 10G)     -- 2/7  0/14  
14  1/8  0/18 -- 1/8/0/6(UP 10G)     ---||--- 2/7/0/6(UP 10G)     -- 2/7  0/18  
15  1/8  0/15 -- 1/8/0/7(UP 10G)     ---||--- 2/7/0/7(UP 10G)     -- 2/7  0/15  
16  1/8  0/19 -- 1/8/0/8(UP 10G)     ---||--- 2/7/0/8(UP 10G)     -- 2/7  0/19

The command output shows that all the CSS links are Up, indicating that the CSS has been set up successfully.

Configure Eth-Trunks between the CSS and its upstream and downstream devices.

# Configure an Eth-Trunk in the CSS and add uplink ports to the Eth-Trunk.

<SwitchA> system-view
[SwitchA] sysname CSS              //Rename the CSS.
[CSS] interface eth-trunk 10
[CSS-Eth-Trunk10] quit
[CSS] interface gigabitethernet 1/1/0/4
[CSS-GigabitEthernet1/1/0/4] eth-trunk 10
[CSS-GigabitEthernet1/1/0/4] quit
[CSS] interface gigabitethernet 2/1/0/4
[CSS-GigabitEthernet2/1/0/4] eth-trunk 10
[CSS-GigabitEthernet2/1/0/4] quit

# Configure an Eth-Trunk in the CSS and add the downlink ports connected to SwitchC to the Eth-Trunk.

[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] quit
[CSS] interface gigabitethernet 1/1/0/3
[CSS-GigabitEthernet1/1/0/3] eth-trunk 20
[CSS-GigabitEthernet1/1/0/3] quit
[CSS] interface gigabitethernet 2/1/0/5
[CSS-GigabitEthernet2/1/0/5] eth-trunk 20
[CSS-GigabitEthernet2/1/0/5] quit

# Configure an Eth-Trunk in the CSS and add the downlink ports connected to SwitchD to the Eth-Trunk.

[CSS] interface eth-trunk 30
[CSS-Eth-Trunk30] quit
[CSS] interface gigabitethernet 1/1/0/5
[CSS-GigabitEthernet1/1/0/5] eth-trunk 30
[CSS-GigabitEthernet1/1/0/5] quit
[CSS] interface gigabitethernet 2/1/0/3
[CSS-GigabitEthernet2/1/0/3] eth-trunk 30
[CSS-GigabitEthernet2/1/0/3] return

# Configure an Eth-Trunk on SwitchE and add member ports to the Eth-Trunk.

<HUAWEI> system-view
[HUAWEI] sysname SwitchE
[SwitchE] interface eth-trunk 10
[SwitchE-Eth-Trunk10] quit
[SwitchE] interface gigabitethernet 1/0/1
[SwitchE-GigabitEthernet1/0/1] eth-trunk 10
[SwitchE-GigabitEthernet1/0/1] quit
[SwitchE] interface gigabitethernet 1/0/2
[SwitchE-GigabitEthernet1/0/2] eth-trunk 10
[SwitchE-GigabitEthernet1/0/2] quit

# Configure an Eth-Trunk on SwitchC and add member ports to the Eth-Trunk.

<HUAWEI> system-view
[HUAWEI] sysname SwitchC
[SwitchC] interface eth-trunk 20
[SwitchC-Eth-Trunk20] quit
[SwitchC] interface gigabitethernet 1/0/1
[SwitchC-GigabitEthernet1/0/1] eth-trunk 20
[SwitchC-GigabitEthernet1/0/1] quit
[SwitchC] interface gigabitethernet 1/0/2
[SwitchC-GigabitEthernet1/0/2] eth-trunk 20
[SwitchC-GigabitEthernet1/0/2] quit

# Configure an Eth-Trunk on SwitchD and add member ports to the Eth-Trunk.

<HUAWEI> system-view
[HUAWEI] sysname SwitchD
[SwitchD] interface eth-trunk 30
[SwitchD-Eth-Trunk30] quit
[SwitchD] interface gigabitethernet 1/0/1
[SwitchD-GigabitEthernet1/0/1] eth-trunk 30
[SwitchD-GigabitEthernet1/0/1] quit
[SwitchD] interface gigabitethernet 1/0/2
[SwitchD-GigabitEthernet1/0/2] eth-trunk 30
[SwitchD-GigabitEthernet1/0/2] quit

# Verify the configuration.

After the configuration is complete, run the display trunkmembership eth-trunk command in any view to check information about Eth-Trunk member ports. For example:

The command output shows information about member ports in Eth-Trunk 10.

<CSS> display trunkmembership eth-trunk 10
Trunk ID: 10
Used status: VALID
TYPE: ethernet
Working Mode : Normal
Number Of Ports in Trunk = 2
Number Of Up Ports in Trunk = 2
Operate status: up

Interface GigabitEthernet1/1/0/4, valid, operate up, weight=1
Interface GigabitEthernet2/1/0/4, valid, operate up, weight=1

Configure the MAD function. The following procedure configures MAD in relay mode and configures SwitchC as the relay agent using the commands applicable to V200R003C00 and later versions.

# In the CSS, configure MAD in relay mode for the inter-device Eth-Trunk.

<CSS> system-view
[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] mad detect mode relay           //In V200R002C00 and earlier versions, the command is dual-active detect mode relay.
[CSS-Eth-Trunk20] quit
[CSS] quit

# Configure the MAD proxy function on SwitchC.

[SwitchC] interface eth-trunk 20
[SwitchC-Eth-Trunk20] mad relay                    //In V200R002C00 and earlier versions, the command is dual-active relay.
[SwitchC-Eth-Trunk20] quit
[SwitchC] quit

# Verify the configuration.

Check the MAD configuration in the CSS.

<CSS> display mad                                 //In V200R002C00 and earlier versions, the command is display dual-active. 
Current MAD domain: 0  
MAD direct detection enabled: NO
MAD relay detection enabled: YES

Check MAD proxy information on SwitchC.

<SwitchC> display mad proxy                      //In V200R002C00 and earlier versions, the command is display dual-active proxy.
Mad relay interfaces configured:
 Eth-Trunk20

Configuration Files

CSS configuration file

#
sysname CSS
#
interface Eth-Trunk10
#
interface Eth-Trunk20
 mad detect mode relay
#
interface Eth-Trunk30
#
interface GigabitEthernet1/1/0/3
 eth-trunk 20
#
interface GigabitEthernet1/1/0/4
 eth-trunk 10
#
interface GigabitEthernet1/1/0/5
 eth-trunk 30
#
interface GigabitEthernet2/1/0/3
 eth-trunk 30
#
interface GigabitEthernet2/1/0/4
 eth-trunk 10
#
interface GigabitEthernet2/1/0/5
 eth-trunk 20
#
return

SwitchC configuration file

#
sysname SwitchC
#
interface Eth-Trunk20
 mad relay
#
interface GigabitEthernet1/0/1
 eth-trunk 20
#
interface GigabitEthernet1/0/2
 eth-trunk 20
#
return

SwitchD configuration file

#
sysname SwitchD
#
interface Eth-Trunk30
#
interface GigabitEthernet1/0/1
 eth-trunk 30
#
interface GigabitEthernet1/0/2
 eth-trunk 30
#
return

SwitchE configuration file

#
sysname SwitchE
#
interface Eth-Trunk10
#
interface GigabitEthernet1/0/1
 eth-trunk 10
#
interface GigabitEthernet1/0/2
 eth-trunk 10
#
return

Related Information

Tool

CSS Assistant

Example for Setting Up a CSS Using Service Ports

Overview of CSS

High reliability: Member switches in a CSS work in redundancy mode. Link redundancy can also be implemented between member switches through link aggregation.
High scalability: Switches can set up a CSS to increase the number of ports, bandwidth, and packet processing capabilities.
Simplified configuration and management: After two switches set up a CSS, they are virtualized into one device. You can log in to the CSS from either member switch to configure and manage the entire CSS.

In service port connection mode, member switches are connected using service ports, without a need for CSS cards. The service ports must be configured as physical member ports of logical CSS ports. Figure 3-44 shows physical member ports and logical CSS ports in a CSS.

Figure 3-44 Service port connection

Physical member port

A physical member port is a service port used to set up a CSS link between CSS member switches. Physical member ports forward service packets or CSS protocol packets between member switches.
Logical CSS port

A logical CSS port is bound to physical member ports for CSS connection. Each CSS member switch supports two logical CSS ports.

Compared with the CSS card connection mode, the service port connection mode is more flexible but is complex to configure and needs to occupy service ports on LPUs.

After a CSS is set up, you are advised to perform the following configurations:

To simplify network configuration, increase uplink bandwidth, and improve reliability, configure inter-device Eth-Trunks in the CSS, connect downstream devices to the CSS in dual-homing mode, and add uplink and downlink ports of the CSS to the Eth-Trunks.
Configure the multi-active detection (MAD) function in the CSS. Two member switches in a CSS use the same IP address and MAC address (CSS system MAC address). Therefore, after the CSS splits, two CSSs using the same IP address and MAC address exist. To prevent this situation, a mechanism is required to check for IP address and MAC address conflicts after a split. MAD is a CSS split detection protocol that provides split detection, multi-active handling, and fault recovery mechanisms when a CSS splits due to a link failure. This minimizes the impact of a CSS split on services.

MAD can be implemented in direct or relay mode, but these modes cannot be configured simultaneously in a CSS. You can configure MAD in relay mode for a CSS when an inter-device Eth-Trunk is configured in the CSS. The direct mode occupies additional ports, and these ports can only be used for MAD after being connected using common cables. In contrast to the direct mode, the relay mode does not occupy additional ports.

Guidelines

When switches using SRUAs, SRUBs, SRUCs, and SRUDs set up a CSS in service port clustering mode, the system software file (system startup package) must be saved in the CF card. If it is saved in the flash memory, the CSS cannot be set up in service port clustering mode.
After two switches set up a CSS, the following features cannot be configured in the CSS:
- Synchronous Ethernet clock
- Precision Time Protocol (PTP) (IEEE 1588)
When configuring MAD, focus on the differences in the command syntax between V200R002C00 and V200R003C00 (and later versions). In V200R002C00, the split detection function is called dual-active detection (DAD).
Regardless of how many MAD links exist, ports of the standby switch will be shut down and no longer forward service packets as long as the CSS splits.

Networking Requirements

An enterprise needs to build a network that has a reliable core layer and simple structure to facilitate configuration and management and reduce deployment costs.

To meet requirements of the enterprise, core switches SwitchA and SwitchB set up a CSS in service port connection mode. SwitchA is the master switch, and SwitchB is the standby switch. Figure 3-45 shows the network topology. Aggregation switches connect to the CSS through Eth-Trunks, and the CSS connects to the upstream network through an Eth-Trunk. In this example, the core switches are the S9706 switches.

Figure 3-45 Setting up a CSS

Configuration Roadmap

The configuration roadmap is as follows:

Install LPUs on SwitchA and SwitchB, and connect cluster cables. Connect four service ports on two LPUs of each switch to improve bandwidth and reliability.
Set the CSS connection mode on SwitchA and SwitchB and set their CSS IDs to 1 and 2 and CSS priorities to 100 and 10 respectively. These configurations ensure that SwitchA has a higher probability to become the master switch.
Configure two logical CSS ports on each of SwitchA and SwitchB and add two physical member ports to each logical CSS port.
Enable the CSS function on SwitchA and then on SwitchB to ensure that SwitchA becomes the master switch.
Check whether a CSS is set up successfully.
Configure uplink and downlink Eth-Trunks for the CSS to improve forwarding bandwidth and reliability.
Configure MAD to minimize the impact of a CSS split on the network.

Procedure

Install hardware modules.
The following describes only the rule for connecting cluster cables between two member switches. If you also need to install LPUs and learn about installation details, see the Switch Cluster Setup Guide.

Connect cluster cables according to the connection rule shown in Figure 3-46.

Figure 3-46 Connection rule for service port clustering
Service ports are connected in two ways according to link distribution:
- 1+0 networking
  
  Each member switch has one logical CSS port and connects to the other member switch through physical member ports on one service card.
- 1+1 networking
  
  Each member switch has two logical CSS ports, and physical member ports of the logical CSS ports are located on two service cards. CSS links on the two service cards implement link redundancy. The preceding figure shows the cable connections in this networking.
When connecting cluster cables, pay attention to the following points:
Physical member ports of a logical CSS port on one switch must connect to physical member ports of a logical CSS port on the other switch.
In 1+1 networking, it is recommended that two service cards have the same number of CSS links.
To ensure reliability, pay attention to the following points when using the preceding two service port clustering networkings:
You are advised to install MPUs in between CSS cards.
To ensure high reliability, you are advised to use 1+1 networking and configure multi-active detection (MAD).
At least two physical member ports on an LPU must be added to one logical CSS port.
It is recommended that the cards where uplink ports and MAD-enabled port are located be the LPUs that are not used for CSS connections.

Configure the CSS connection mode, CSS ID, and CSS priority.

# Configure the CSS function on SwitchA. Configure the service port connection mode, set the CSS priority to 100, and retain the default CSS ID 1.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] set css mode lpu
[SwitchA] set css priority 100

# Configure the CSS function on SwitchB. Configure the service port connection mode, and set the CSS ID to 2 and CSS priority to 10.

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] set css mode lpu
[SwitchB] set css id 2
[SwitchB] set css priority 10

# Check the CSS configuration.

After the configuration is complete, run the display css status saved command to check the CSS configuration.

Check the CSS configuration on SwitchA.

[SwitchA] display css status saved
Current Id   Saved Id     CSS Enable   CSS Mode    Priority    Master force     
------------------------------------------------------------------------------  
1            1            Off          LPU         100         Off

Check the CSS configuration on SwitchB.

[SwitchB] display css status saved
Current Id   Saved Id     CSS Enable   CSS Mode    Priority    Master force     
------------------------------------------------------------------------------  
1            2            Off          LPU         10          Off

Configure logical CSS ports.

# On SwitchA, configure service ports XGE1/0/1 and XGE1/0/2 as physical member ports and add them to CSS port 1, and configure service ports XGE2/0/1 and XGE2/0/2 as physical member ports and add them to CSS port 2.

[SwitchA] interface css-port 1
[SwitchA-css-port1] port interface xgigabitethernet 1/0/1 to xgigabitethernet 1/0/2 enable
[SwitchA-css-port1] quit
[SwitchA] interface css-port 2
[SwitchA-css-port2] port interface xgigabitethernet 2/0/1 to xgigabitethernet 2/0/2 enable
[SwitchA-css-port2] quit

# On SwitchB, configure service ports XGE1/0/1 and XGE1/0/2 as physical member ports and add them to CSS port 1, and configure service ports XGE2/0/1 and XGE2/0/2 as physical member ports and add them to CSS port 2.

[SwitchB] interface css-port 1
[SwitchB-css-port1] port interface xgigabitethernet 1/0/1 to xgigabitethernet 1/0/2 enable
[SwitchB-css-port1] quit
[SwitchB] interface css-port 2
[SwitchB-css-port2] port interface xgigabitethernet 2/0/1 to xgigabitethernet 2/0/2 enable
[SwitchB-css-port2] quit

After the configuration is complete, run the display css css-port saved command to check whether the ports are Up.

Enable the CSS function.

# Enable the CSS function on SwitchA and restart SwitchA.

[SwitchA] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is LPU. Reboot now? [Y/N]:y

# Enable the CSS function on SwitchB and restart SwitchB.

[SwitchB] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is LPU. Reboot now? [Y/N]:y

Check whether a CSS is set up successfully.

# View the indicator status.

The ACT indicator on an MPU of SwitchA is steady green, indicating that the MPU is the active MPU of the CSS and SwitchA is the master switch.

The ACT indicator on an MPU of SwitchB is blinking green, indicating that the MPU is the standby MPU of the CSS and SwitchB is the standby switch.

# Log in to the CSS through the console port on any MPU to check whether the CSS has been set up successfully.

<SwitchA> display device
Chassis 1 (Master Switch)                                                       
S9706's Device status:                                                          
Slot  Sub Type         Online    Power      Register       Status     Role   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   
1     -   EH1D2X12SSA0 Present   PowerOn    Registered     Normal     NA        
2     -   EH1D2X12SSA0 Present   PowerOn    Registered     Normal     NA        
7     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Master    
8     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Slave     
PWR1  -   -            Present   PowerOn    Registered     Normal     NA        
PWR2  -   -            Present   -          Unregistered   -          NA        
CMU2  -   EH1D200CMU00 Present   PowerOn    Registered     Normal     Master    
FAN1  -   -            Present   PowerOn    Registered     Abnormal   NA        
FAN2  -   -            Present   -          Unregistered   -          NA        
Chassis 2 (Standby Switch)                                                      
S9706's Device status:                                                          
Slot  Sub Type         Online    Power      Register       Status     Role   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   
1     -   EH1D2X12SSA0 Present   PowerOn    Registered     Normal     NA        
2     -   EH1D2X12SSA0 Present   PowerOn    Registered     Normal     NA        
7     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Master    
8     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Slave     
PWR1  -   -            Present   PowerOn    Registered     Normal     NA        
PWR2  -   -            Present   PowerOn    Registered     Normal     NA        
CMU1  -   EH1D200CMU00 Present   PowerOn    Registered     Normal     Master    
FAN1  -   -            Present   PowerOn    Registered     Normal     NA        
FAN2  -   -            Present   PowerOn    Registered     Normal     NA

The command output shows the card status of both member switches, indicating that the CSS has been set up successfully.

# Check whether the CSS link topology is the same as the actual hardware connection.

<SwitchA> display css channel all
CSS link-down-delay: 500ms 

                Chassis 1               ||               Chassis 2              
================================================================================
Num [CSS port]       [LPU Port]         ||    [LPU Port]            [CSS port]  
 1     1/1    XGigabitEthernet1/1/0/1      XGigabitEthernet2/1/0/1      2/1     
 2     1/1    XGigabitEthernet1/1/0/2      XGigabitEthernet2/1/0/2      2/1     
 3     1/2    XGigabitEthernet1/2/0/1      XGigabitEthernet2/2/0/1      2/2     
 4     1/2    XGigabitEthernet1/2/0/2      XGigabitEthernet2/2/0/2      2/2     
                Chassis 2               ||               Chassis 1              
================================================================================
Num [CSS port]       [LPU Port]         ||    [LPU Port]            [CSS port]  
 1     2/1    XGigabitEthernet2/1/0/1      XGigabitEthernet1/1/0/1      1/1     
 2     2/1    XGigabitEthernet2/1/0/2      XGigabitEthernet1/1/0/2      1/1     
 3     2/2    XGigabitEthernet2/2/0/1      XGigabitEthernet1/2/0/1      1/2     
 4     2/2    XGigabitEthernet2/2/0/2      XGigabitEthernet1/2/0/2      1/2

The command output shows that the CSS link topology is the same as the actual hardware connection, indicating that the CSS has been set up successfully.

Configure Eth-Trunks between the CSS and its upstream and downstream devices.

# Configure an Eth-Trunk in the CSS and add uplink ports to the Eth-Trunk.

<SwitchA> system-view
[SwitchA] sysname CSS              //Rename the CSS.
[CSS] interface eth-trunk 10
[CSS-Eth-Trunk10] quit
[CSS] interface xgigabitethernet 1/3/0/4
[CSS-XGigabitEthernet1/3/0/4] eth-trunk 10
[CSS-XGigabitEthernet1/3/0/4] quit
[CSS] interface xgigabitethernet 2/3/0/4
[CSS-XGigabitEthernet2/3/0/4] eth-trunk 10
[CSS-XGigabitEthernet2/3/0/4] quit

# Configure an Eth-Trunk in the CSS and add the downlink ports connected to SwitchC to the Eth-Trunk.

[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] quit
[CSS] interface gigabitethernet 1/4/0/3
[CSS-GigabitEthernet1/4/0/3] eth-trunk 20
[CSS-GigabitEthernet1/4/0/3] quit
[CSS] interface gigabitethernet 2/4/0/5
[CSS-GigabitEthernet2/4/0/5] eth-trunk 20
[CSS-GigabitEthernet2/4/0/5] quit

# Configure an Eth-Trunk in the CSS and add the downlink ports connected to SwitchD to the Eth-Trunk.

[CSS] interface eth-trunk 30
[CSS-Eth-Trunk30] quit
[CSS] interface gigabitethernet 1/4/0/5
[CSS-GigabitEthernet1/4/0/5] eth-trunk 30
[CSS-GigabitEthernet1/4/0/5] quit
[CSS] interface gigabitethernet 2/4/0/3
[CSS-GigabitEthernet2/4/0/3] eth-trunk 30
[CSS-GigabitEthernet2/4/0/3] return

# Configure an Eth-Trunk on SwitchE and add member ports to the Eth-Trunk.

<HUAWEI> system-view
[HUAWEI] sysname SwitchE
[SwitchE] interface eth-trunk 10
[SwitchE-Eth-Trunk10] quit
[SwitchE] interface xgigabitethernet 1/0/1
[SwitchE-XGigabitEthernet1/0/1] eth-trunk 10
[SwitchE-XGigabitEthernet1/0/1] quit
[SwitchE] interface xgigabitethernet 1/0/2
[SwitchE-XGigabitEthernet1/0/2] eth-trunk 10
[SwitchE-XGigabitEthernet1/0/2] quit

# Configure an Eth-Trunk on SwitchC and add member ports to the Eth-Trunk.

<HUAWEI> system-view
[HUAWEI] sysname SwitchC
[SwitchC] interface eth-trunk 20
[SwitchC-Eth-Trunk20] quit
[SwitchC] interface gigabitethernet 1/0/1
[SwitchC-GigabitEthernet1/0/1] eth-trunk 20
[SwitchC-GigabitEthernet1/0/1] quit
[SwitchC] interface gigabitethernet 1/0/2
[SwitchC-GigabitEthernet1/0/2] eth-trunk 20
[SwitchC-GigabitEthernet1/0/2] quit

# Configure an Eth-Trunk on SwitchD and add member ports to the Eth-Trunk.

<HUAWEI> system-view
[HUAWEI] sysname SwitchD
[SwitchD] interface eth-trunk 30
[SwitchD-Eth-Trunk30] quit
[SwitchD] interface gigabitethernet 1/0/1
[SwitchD-GigabitEthernet1/0/1] eth-trunk 30
[SwitchD-GigabitEthernet1/0/1] quit
[SwitchD] interface gigabitethernet 1/0/2
[SwitchD-GigabitEthernet1/0/2] eth-trunk 30
[SwitchD-GigabitEthernet1/0/2] quit

# Verify the configuration.

After the configuration is complete, run the display trunkmembership eth-trunk command in any view to check information about Eth-Trunk member ports. For example:

The command output shows information about member ports in Eth-Trunk 10.

<CSS> display trunkmembership eth-trunk 10
Trunk ID: 10
Used status: VALID
TYPE: ethernet
Working Mode : Normal
Number Of Ports in Trunk = 2
Number Of Up Ports in Trunk = 2
Operate status: up

Interface XGigabitEthernet1/3/0/4, valid, operate up, weight=1
Interface XGigabitEthernet2/3/0/4, valid, operate up, weight=1

Configure the MAD function. The following procedure configures MAD in relay mode and configures SwitchC as the relay agent using the commands applicable to V200R003C00 and later versions.

# In the CSS, configure MAD in relay mode for the inter-device Eth-Trunk.

<CSS> system-view
[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] mad detect mode relay           //In V200R002C00, the command is dual-active detect mode relay.
[CSS-Eth-Trunk20] quit
[CSS] quit

# Configure the MAD proxy function on SwitchC.

[SwitchC] interface eth-trunk 20
[SwitchC-Eth-Trunk20] mad relay                    //In V200R002C00, the command is dual-active relay.
[SwitchC-Eth-Trunk20] quit
[SwitchC] quit

# Verify the configuration.

Check the MAD configuration in the CSS.

<CSS> display mad                                 //In V200R002C00, the command is display dual-active. 
Current MAD domain: 0  
MAD direct detection enabled: NO
MAD relay detection enabled: YES

Check MAD proxy information on SwitchC.

<SwitchC> display mad proxy                     //In V200R002C00, the command is display dual-active proxy.
Mad relay interfaces configured:
 Eth-Trunk20

Configuration Files

CSS configuration file

#
sysname CSS
#
interface Eth-Trunk10
#
interface Eth-Trunk20
 mad detect mode relay
#
interface Eth-Trunk30
#
interface GigabitEthernet1/4/0/3
 eth-trunk 20
#
interface XGigabitEthernet1/3/0/4
 eth-trunk 10
#
interface GigabitEthernet1/4/0/5
 eth-trunk 30
#
interface GigabitEthernet2/4/0/3
 eth-trunk 30
#
interface XGigabitEthernet2/3/0/4
 eth-trunk 10
#
interface GigabitEthernet2/4/0/5
 eth-trunk 20
#
return

SwitchC configuration file

#
sysname SwitchC
#
interface Eth-Trunk20
 mad relay
#
interface GigabitEthernet1/0/1
 eth-trunk 20
#
interface GigabitEthernet1/0/2
 eth-trunk 20
#
return

SwitchD configuration file

#
sysname SwitchD
#
interface Eth-Trunk30
#
interface GigabitEthernet1/0/1
 eth-trunk 30
#
interface GigabitEthernet1/0/2
 eth-trunk 30
#
return

SwitchE configuration file

#
sysname SwitchE
#
interface Eth-Trunk10
#
interface XGigabitEthernet1/0/1
 eth-trunk 10
#
interface XGigabitEthernet1/0/2
 eth-trunk 10
#
return

Related Information

Tool

CSS Assistant

Combining Standalone Switches into a CSS

Networking Requirements

Two modular switches at the aggregation layer use VRRP and STP to implement gateway backup. To simplify the configuration, the two modular switches need to be combined into a logical CSS.

In Figure 3-47, S1 and S2 at the aggregation layer are two standalone switches and need to be combined into a CSS to simplify configuration and facilitate maintenance and management.

Figure 3-47 Networking diagram of combining standalone switches into a CSS

When two standalone devices are combined into a CSS, major configuration changes include:

The VRRP gateway backup protocol deployed at the aggregation layer is not required and its configuration needs to be deleted.
The STP loop prevention protocol deployed at the access layer is not required and its configuration needs to be deleted.
The links at the access, aggregation, and core layers are changed to Eth-Trunks, and related interface configurations need to be changed, including basic VLAN configuration, QoS configuration, and ACL configuration.

Guidelines

This operation applies to CSS card clustering and service port clustering. Before combining two standalone switches into a CSS, ensure that the hardware and software of the two switches meet CSS requirements. For CSS card clustering, CSS cards and cluster cables have been prepared. For service port clustering, service cards that support service port clustering and cluster cables have been prepared.
After the CSS function is enabled on a standalone switch, configurations on the interfaces of the switch will be lost. Therefore, back up the configuration file before enabling the CSS function.
The following procedure provides only the related configurations. Whether other configurations need to be changed depends on the actual networking.

Procedure

In the original networking, traffic at the access layer is load-balanced among multiple links through STP and VRRP. In Figure 3-48, some traffic is forwarded through S1 and some traffic is forwarded through S2.
Figure 3-48 Existing traffic forwarding
Manually shut down the uplink and downlink ports of S2 to change the STP and VRRP status so that S2 is isolated from the network and all traffic is forwarded through S1, as shown in Figure 3-49.
Figure 3-49 Traffic forwarding after an STP and VRRP status switchover
Back up the configuration file of S2. After the CSS function is enabled on a standalone switch, the interface number format on the switch is changed from slot ID/subcard ID/port number to stack member ID/slot ID/subcard ID/port number, and the configurations on the interfaces of the switch are lost.

Change S2 to the CSS state.

Procedure for configuring service port clustering

Power off S2, install service cards, and power on S2.

Configure the CSS connection mode and CSS priority on S2.

<S2> system-view
[S2] set css mode lpu
[S2] set css priority 200  // Set the CSS priority to 200 to make S2 become the CSS master. The default CSS priority is 1.
[S2] display css status saved  // Check whether the configuration is correct.
Current Id   Saved Id     CSS Enable   CSS Mode    Priority    Master Force                                                         
------------------------------------------------------------------------------                                                      
1            1            Off          LPU         200         On

Configure service ports as CSS ports. For example, configure service ports XGE1/0/1, XGE1/0/2, XGE2/0/1, and XGE2/0/2 as CSS ports.

[S2] interface css-port 1
[S2-css-port1] port interface xgigabitethernet 1/0/1 to xgigabitethernet 1/0/2 enable
[S2-css-port1] quit
[S2] interface css-port 2
[S2-css-port2] port interface xgigabitethernet 2/0/1 to xgigabitethernet 2/0/2 enable
[S2-css-port2] quit

Enable the CSS function on S2 and restart S2.

[S2] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is LPU. Reboot now? [Y/N]:y

After S2 is restarted, check its CSS status. If the following output is displayed, S2 has been changed to the CSS state:

<S2> display device
Chassis 1 (Master Switch)                                                       
S9706's Device status:                                                          
Slot  Sub Type         Online    Power      Register       Status     Role   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   
1     -   EH1D2X12SSA0 Present   PowerOn    Registered     Normal     NA        
2     -   EH1D2X12SSA0 Present   PowerOn    Registered     Normal     NA        
3     -   EH1D2S04SX1E Present   PowerOn    Registered     Normal     NA                                                            
4     -   EH1D2S04SX1E Present   PowerOn    Registered     Normal     NA                                                            
7     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Master    
8     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Slave     
PWR1  -   -            Present   PowerOn    Registered     Normal     NA        
PWR2  -   -            Present   -          Unregistered   -          NA        
CMU2  -   EH1D200CMU00 Present   PowerOn    Registered     Normal     Master    
FAN1  -   -            Present   PowerOn    Registered     Abnormal   NA        
FAN2  -   -            Present   -          Unregistered   -          NA

Procedure for configuring CSS card clustering

Power off S2, install CSS cards, and power on S2.

Configure the CSS priority on S2.

<S2> system-view
[S2] set css priority 200  // Set the CSS priority to 200 to make S2 become the CSS master. The default CSS priority is 1.
[S2] display css status saved  // Check whether the configuration is correct.
Current Id   Saved Id     CSS Enable   CSS Mode    Priority    Master Force                                                         
------------------------------------------------------------------------------                                                      
1            1            Off          CSS card    200         On

Enable the CSS function on S2 and restart S2.

[S2] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is CSS card. Reboot now? [Y/N]:y

After S2 is restarted, check its CSS status. If the following output is displayed, S2 has been changed to the CSS state:

<S2> display device
Chassis 1 (Master Switch)                                                       
S9706's Device status:                                                          
Slot  Sub Type         Online    Power      Register       Status     Role   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   
3     -   EH1D2S04SX1E Present   PowerOn    Registered     Normal     NA                                                            
4     -   EH1D2S04SX1E Present   PowerOn    Registered     Normal     NA                                                            
7     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Master    
      1   EH1D2VS08000 Present   PowerOn    Registered     Normal     NA        
8     -   EH1D2SRUC000 Present   PowerOn    Registered     Normal     Slave     
      1   EH1D2VS08000 Present   PowerOn    Registered     Normal     NA        
PWR1  -   -            Present   PowerOn    Registered     Normal     NA        
PWR2  -   -            Present   -          Unregistered   -          NA        
CMU2  -   EH1D200CMU00 Present   PowerOn    Registered     Normal     Master    
FAN1  -   -            Present   PowerOn    Registered     Abnormal   NA        
FAN2  -   -            Present   -          Unregistered   -          NA

Change the configuration of S2, which has been changed to a single-chassis cluster CSS-1. Alternatively, change the configuration after S1 and S2 are combined into a CSS. Changing the configuration of S2 before S1 and S2 are combined into a CSS can reduce the traffic loss.

Figure 3-50 Single-chassis CSS

Bind uplink ports XGE1/4/0/1 and XGE1/4/0/2 of CSS-1 to Eth-Trunks and move the configurations of these ports to the Eth-Trunks.

For example: The configurations on the original ports (connecting CSS-1 to devices at the core layer) are as follows:

#
interface XGigabitEthernet4/0/1
 undo portswitch                                                                                                                    
 ip address 192.168.4.2 255.255.255.0 
#
interface XGigabitEthernet4/0/2
 port link-type trunk                                                                                                               
 port trunk allow-pass vlan 100 200
#

Change the configurations.

<S2> system-view
[S2] sysname CSS  // Change the device name to facilitate maintenance.
[CSS] interface eth-trunk 20  // Add the port connecting the CSS to a core device to Eth-Trunk 20.
[CSS-Eth-Trunk20] trunkport xgigabitethernet1/4/0/1
[CSS-Eth-Trunk20] ip address 192.168.4.2 255.255.255.0
[CSS-Eth-Trunk20] quit
[CSS] interface eth-trunk 10  // Add the port connecting the CSS to another core device to Eth-Trunk 10.
[CSS-Eth-Trunk10] trunkport xgigabitethernet1/4/0/2
[CSS-Eth-Trunk10] port link-type trunk
[CSS-Eth-Trunk10] port trunk allow-pass vlan 100 200
[CSS-Eth-Trunk10] quit

Change the configurations of devices at the core layer and access layer and bind physical ports to Eth-Trunks. The procedure is similar to the preceding procedure.

Delete the VRRP configuration on CSS-1.

For example, the configurations of VLANIF interfaces are as follows:

#
interface Vlanif100
 ip address 10.1.10.1 255.255.255.0
 vrrp vrid 1 virtual-ip 10.1.10.111
 vrrp vrid 1 priority 120
#
interface Vlanif200
 ip address 10.1.20.1 255.255.255.0
 vrrp vrid 2 virtual-ip 10.1.20.111
#

Delete the configurations of VLANIF interfaces.

[CSS] interface vlanif 100
[CSS-Vlanif100] undo vrrp vrid 1
[CSS-Vlanif100] undo ip address
[CSS-Vlanif100] quit
[CSS] interface vlanif 200
[CSS-Vlanif200] undo vrrp vrid 2
[CSS-Vlanif200] undo ip address
[CSS-Vlanif200] quit

Delete unnecessary network segments from the OSPF routing domain.
Change the configurations of the interfaces on which QoS and ACLs are configured to bind these interfaces to Eth-Trunks.
Change the STP priority of CSS-1 so that CSS-1 becomes the root switch of all VLANs.

Run the undo shutdown command to disable the interfaces on CSS-1 to check whether Layer 2 and Layer 3 forwarding between CSS-1 and devices at the access layer and core layer is normal.
After confirming that Layer 2 and Layer 3 forwarding between CSS-1 and devices at the access layer and core layer is normal, shut down interfaces on S1 so that S1 is isolated from the network and all traffic is forwarded through CSS-1.
Figure 3-51 Traffic switched to CSS-1
Change S1 to the CSS state. After S1 is added to CSS-1, S1 uses the configuration file of CSS-1.

SK_0177091025__ul589778219183455">

Procedure for configuring service port clustering

Power off S1, install service cards, connect the cluster cables between S1 and CSS-1, and power on S1.

Configure the cluster connection mode and CSS ID and retain the default CSS priority 1 on S1.

<S1> system-view b1187861017183455">set css mode lpu b1016199659183455">set css id 2 b1617437217183455">display css status saved  // Check whether the configuration is correct. Priority    Master Force -------------------------------------- LPU         1           On

id="EN-US_TASK_0177091025__li796688000183455">Configure service ports as CSS ports. For example, configure service ports XGE1/0/1, XGE1/0/2, XGE2/0/1, and XGE2/0/2 as CSS ports.

[S1] interface css-port 1 77091025__b435265993183455">port interface xgigabitethernet 1/0/1 to xgigabitethernet 1/0/2 enable 77091025__b1892590389183455">quit b1425002007183455">interface css-port 2 77091025__b1348198811183455">port interface xgigabitethernet 2/0/1 to xgigabitethernet 2/0/2 enable 77091025__b2080086391183455">quit

id="EN-US_TASK_0177091025__li1383669919183455">Enable the CSS function on S1 and restart S1.

[S1] css enable will take effect only after the system is rebooted. The next CSS mode is LPU. Reboot now? [Y/N]:y

id="EN-US_TASK_0177091025__li1323537950183455">After S1 is restarted, check its CSS status. If the following output is displayed, S1 has joined the CSS.

<CSS> display device 394995183455">Chassis 1 (Master Switch)

Register       Status     Role - - - - - - - - - - - - - - - - - - - - - - - Registered     Normal     NA Registered     Normal     NA Registered     Normal     NA Registered     Normal     NA Registered     Normal     Master Registered     Normal     Slave Registered     Normal     NA Unregistered   -          NA Registered     Normal     Master Registered     Abnormal   NA Unregistered   -          NA 232423183455">Chassis 2 (Standby Switch)

Register       Status     Role - - - - - - - - - - - - - - - - - - - - - - - Registered     Normal     NA Registered     Normal     NA Registered     Normal     NA Registered     Normal     NA Registered     Normal     Master Registered     Normal     Slave Registered     Normal     NA Unregistered   -          NA Registered     Normal     Master Registered     Abnormal   NA Unregistered   -          NA id="EN-US_TASK_0177091025__li1613559107183455">Procedure for configuring CSS card clusteringPower off S1, install CSS cards, connect the cluster cables between S1 and CSS-1, and power on S1.
Configure the CSS ID and retain the default CSS priority 1 on S1.<S1> system-view b2009212031183455">set css id 2
 id="EN-US_TASK_0177091025__li172510537183455">Enable the CSS function on S1 and restart S1.[S1] css enable will take effect only after the system is rebooted. The next CSS mode is CSS card. Reboot now? [Y/N]:y
 id="EN-US_TASK_0177091025__li877971402183455">After S1 is restarted, check its CSS status. If the following output is displayed, S1 has joined the CSS.<CSS> display device 06827183455">Chassis 1 (Master Switch)

Register       Status     Role - - - - - - - - - - - - - - - - - - - - - - - Registered     Normal     NA Registered     Normal     NA Registered     Normal     Master Registered     Normal     NA Registered     Normal     Slave Registered     Normal     NA Registered     Normal     NA Unregistered   -          NA Registered     Normal     Master Registered     Abnormal   NA Unregistered   -          NA 57869183455">Chassis 2 (Standby Switch)

Register       Status     Role - - - - - - - - - - - - - - - - - - - - - - - Registered     Normal     NA Registered     Normal     NA Registered     Normal     Master Registered     Normal     NA Registered     Normal     Slave Registered     Normal     NA Registered     Normal     NA Unregistered   -          NA Registered     Normal     Master Registered     Abnormal   NA Unregistered   -          NA
S1 is changed to CSS-2 and becomes the stack standby.
Figure 3-52  Two CSS systems merging into one


Change the configurations of CSS-2 and add interfaces of CSS-2 to Eth-Trunks.
Add uplink ports XGE2/4/0/1 and XGE2/4/0/2 of CSS-2 to Eth-Trunks.
[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] trunkport xgigabitethernet2/4/0/1
[CSS-Eth-Trunk20] quit
[CSS] interface eth-trunk 10
[CSS-Eth-Trunk10] trunkport xgigabitethernet2/4/0/2
[CSS-Eth-Trunk10] quit

Change the configurations of devices at the core layer and access layer and bind physical ports to Eth-Trunks. The procedure is similar to the preceding procedure.
Run the undo shutdown command to disable the interfaces of CSS-2 and check whether Layer 2 and Layer 3 forwarding between CSS-2 and devices at the core layer and access layer is normal. In this case, S1 and S2 have been combined into a CSS, as shown in Figure 3-53.
Figure 3-53  Traffic forwarding after a CSS merge

CSS Support
Example for Setting Up a CSS of Two Member Switches Using CSS Cards
Example for Setting Up a CSS Using Service Ports
Combining Standalone Switches into a CSS

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Updated: 2023-07-29

Document ID: EDOC1000069520

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Example for Setting Up a CSS of Two Member Switches Using CSS Cards

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Procedure

Configuration Files

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Example for Setting Up a CSS Using Service Ports

Overview of CSS

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Procedure

Configuration Files

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Combining Standalone Switches into a CSS

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Procedure

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