S300, S500, S2700, S3700, S5700, S6700, S7700, and S9700 Series Switches Typical Configuration Examples
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.
Example for Configuring the Rate and Duplex Mode of an Ethernet Interface
Overview
- Half-duplex mode: An interface in this mode can send data only when it is not receiving data and, conversely, it can receive data only when it is not sending data. A limit on the transmission distance applies to this mode.
- Full-duplex mode: An interface in this mode can send and receive data simultaneously. The maximum throughput in full-duplex mode is theoretically double that in half-duplex mode. There is no limit on the transmission distance in this mode.
- In auto-negotiation mode, interfaces at both ends of a link negotiate the rate and duplex mode. If the negotiation succeeds, the two interfaces use the same duplex mode and rate. The auto-negotiation function takes effect only when both the connected devices support it. If the remote device does not support auto-negotiation or uses a different auto-negotiation mode, the connected interfaces may be Down.
You can configure the local interface to work in non-auto-negotiation mode and manually configure the interface rate and duplex mode in the following situations:
The remote device does not support auto-negotiation.
After auto-negotiation is configured, the local and remote devices cannot communicate.
After auto-negotiation is configured, the physical link between the local and remote devices is connected, but many error packets are generated or packet loss occurs.
Configuration Notes
- Usage restrictions
Ethernet interfaces at both ends of a link must work in the same auto-negotiation mode. Otherwise, the interfaces may be Down.
When the working rate of a GE electrical interface is 1000 Mbit/s, the interface supports only the full-duplex mode and does not need to negotiate the duplex mode with the remote interface.
Interfaces at both ends of a link must use the same rate and duplex mode.
Networking Requirements
As shown in Figure 3-68, Server1, Server2, and Server3 form a server cluster and connect to GE1/0/1, GE1/0/2, and GE1/0/3 of the Switch respectively. The Switch connects to the Internet through GE1/0/4.
Due to limitations of network adapters on the servers, GE1/0/1, GE1/0/2, and GE1/0/3 can only work in half-duplex mode after negotiating with connected server interfaces. As a result, packet loss occurs when the service traffic volume is high. In addition, the rate is negotiated to 1000 Mbit/s for GE1/0/1, GE1/0/2, and GE1/0/3. When the three servers concurrently send data at the rate of 1000 Mbit/s, the outbound interface GE1/0/4 will be congested. Users require that packet loss and congestion do not occur.
Configuration Roadmap
The configuration roadmap is as follows:
- Configure the switch interfaces to work in non-auto-negotiation mode to prevent the interface rate from being affected by the network adapter rate on the servers.
Set the duplex mode to full-duplex for the interfaces working in non-auto-negotiation mode to avoid packet loss.
Set the rate to 100 Mbit/s for the interfaces working in non-auto-negotiation mode to avoid congestion on the outbound interface.
Procedure
- Create a port group and add GE1/0/1, GE1/0/2, and GE1/0/3 to the port group.
<HUAWEI> system-view [HUAWEI] sysname Switch [Switch] port-group portgroup1 //Create a permanent port group portgroup1. [Switch-port-group-portgroup1] group-member GE1/0/1 to GE1/0/3 //Add GE1/0/1,GE1/0/2, and GE1/0/3 to portgroup1.
- Configure GE1/0/1, GE1/0/2, and GE1/0/3to work in non-auto-negotiation mode, and set the duplex mode to full-duplex and rate to 100 Mbit/s for these interfaces in a batch.
[Switch-port-group-portgroup1] undo negotiation auto //Configure interfaces to work in non-auto-negotiation mode in a batch. [Switch-GigabitEthernet1/0/1] undo negotiation auto [Switch-GigabitEthernet1/0/2] undo negotiation auto [Switch-GigabitEthernet1/0/3] undo negotiation auto [Switch-port-group-portgroup1] duplex full //Set the duplex mode of the interfaces to full-duplex in a batch. [Switch-GigabitEthernet1/0/1] duplex full [Switch-GigabitEthernet1/0/2] duplex full [Switch-GigabitEthernet1/0/3] duplex full [Switch-port-group-portgroup1] speed 100 //Set the rate of the interfaces to 100 Mbit/s in a batch. [Switch-GigabitEthernet1/0/1] speed 100 [Switch-GigabitEthernet1/0/2] speed 100 [Switch-GigabitEthernet1/0/3] speed 100 [Switch-port-group-portgroup1] quit
![]()
After a configuration command is executed in the port group view, the device will deliver the configuration to each port in the port group and display the configuration of each port.
- Verify the configuration.
Run the display interface gigabitethernet 1/0/1 command in any view to check the interface rate and duplex mode.
[Switch] display interface gigabitethernet 1/0/1 ... Port Mode: COMMON COPPER Speed : 100, Loopback: NONE Duplex: FULL, Negotiation: DISABLE Mdi : AUTO, Flow-control: DISABLE ...
The command output shows that the interface works in non-negotiation mode, the rate is 100 Mbit/s, and the duplex mode is full-duplex.
Similarly, run the display interface gigabitethernet 1/0/2 and display interface gigabitethernet 1/0/3 commands on GE1/0/2 and GE1/0/3 respectively to check interface working information.
Configuration File
Switch configuration file
# sysname Switch # interface GigabitEthernet1/0/1 undo negotiation auto speed 100 # interface GigabitEthernet1/0/2 undo negotiation auto speed 100 # interface GigabitEthernet1/0/3 undo negotiation auto speed 100 # port-group portgroup1 group-member GigabitEthernet1/0/1 group-member GigabitEthernet1/0/2 group-member GigabitEthernet1/0/3 # return