Example for Configuring an Inter-Chassis Eth-Trunk to Forward Traffic Preferentially Through Local Member Interfaces (CSS)

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Networking Requirements

On the network shown in Figure 3-27, Switch3 and Switch4 are connected through CSS cables to increase the total capacity. The two switches form one logical switch. To improve reliability, physical interfaces on the two switches are added to an Eth-Trunk. When the network runs properly, traffic from VLAN 2 is forwarded through GE1/0/1 and GE1/0/2, and traffic from VLAN 3 is forwarded through GE1/0/1 and GE1/0/2. This increases bandwidth use efficiency between devices but reduces traffic forwarding efficiency.

To improve traffic forwarding efficiency, traffic from VLAN 2 should be forwarded through GE1/0/1 and traffic from VLAN 3 should be forwarded through GE1/0/2. To achieve this goal, configure the Eth-Trunk to preferentially forward local traffic.

Figure 3-27 Preferentially forwarding traffic through the local member interface

Configuration Roadmap

The configuration roadmap is as follows:

Create an Eth-Trunk.
Add member interfaces to the Eth-Trunk.
Configure the Eth-Trunk to preferentially forward local traffic.
Configure the Layer 2 forwarding function.

Procedure

Create an Eth-Trunk and configure the Eth-Trunk to allow packets from all VLANs to pass through.

# Configure the CSS.

<HUAWEI> system-view

[HUAWEI] sysname CSS

[CSS] interface eth-trunk 10

[CSS-Eth-Trunk10] port link-type trunk

[CSS-Eth-Trunk10] port trunk allow-pass vlan all

[CSS-Eth-Trunk10] quit

# Configure the PE.

<HUAWEI> system-view

[HUAWEI] sysname PE

[PE] interface eth-trunk 10

[PE-Eth-Trunk10] port link-type trunk

[PE-Eth-Trunk10] port trunk allow-pass vlan all

[PE-Eth-Trunk10] quit

Add member interfaces to the Eth-Trunk.

# Configure the CSS.

[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 the PE.

[PE] interface gigabitethernet 1/0/1

[PE-GigabitEthernet1/0/1] eth-trunk 10

[PE-GigabitEthernet1/0/1] quit

[PE] interface gigabitethernet 1/0/2

[PE-GigabitEthernet1/0/2] eth-trunk 10

[PE-GigabitEthernet1/0/2] quit

In the CSS view, configure the Eth-Trunk to preferentially forward local traffic.

[CSS] interface eth-trunk 10

[CSS-Eth-Trunk10] local-preference enable

[CSS-Eth-Trunk10] quit

Configure the Layer 2 forwarding function.

# Configure the CSS.

[CSS] vlan batch 2 3

[CSS] interface gigabitethernet 1/1/0/3

[CSS-GigabitEthernet1/1/0/3] port link-type trunk

[CSS-GigabitEthernet1/1/0/3] port trunk allow-pass vlan 2

[CSS-GigabitEthernet1/1/0/3] quit

[CSS] interface gigabitethernet 2/1/0/3

[CSS-GigabitEthernet2/1/0/3] port link-type trunk

[CSS-GigabitEthernet2/1/0/3] port trunk allow-pass vlan 3

[CSS-GigabitEthernet2/1/0/3] quit

# Configure Switch1.

<HUAWEI> system-view

[HUAWEI] sysname Switch1

[Switch1] vlan 2

[Switch1-vlan2] quit

[Switch1] interface gigabitethernet 1/0/1

[Switch1-GigabitEthernet1/0/1] port link-type trunk

[Switch1-GigabitEthernet1/0/1] port trunk allow-pass vlan 2

[Switch1-GigabitEthernet1/0/1] quit

[Switch1] interface gigabitethernet 1/0/2

[Switch1-GigabitEthernet1/0/2] port link-type trunk

[Switch1-GigabitEthernet1/0/2] port trunk allow-pass vlan 2

[Switch1-GigabitEthernet1/0/2] quit

# Configure Switch2.

<HUAWEI> system-view

[HUAWEI] sysname Switch2

[Switch2] vlan 3

[Switch2-vlan3] quit

[Switch2] interface gigabitethernet 1/0/1

[Switch2-GigabitEthernet1/0/1] port link-type trunk

[Switch2-GigabitEthernet1/0/1] port trunk allow-pass vlan 3

[Switch2-GigabitEthernet1/0/1] quit

[Switch2] interface gigabitethernet 1/0/2

[Switch2-GigabitEthernet1/0/2] port link-type trunk

[Switch2-GigabitEthernet1/0/2] port trunk allow-pass vlan 3

[Switch2-GigabitEthernet1/0/2] quit

Verify the configuration.

Run the display trunkmembership eth-trunk command in any view to check information about Eth-Trunk member interfaces.

The display on the CSS is used as an example.

<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

Configuration Files

CSS configuration file

#
 sysname CSS
#
 vlan batch 2 3
#
interface Eth-Trunk10
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet1/1/0/3
 port link-type trunk
 port trunk allow-pass vlan 2
#
interface GigabitEthernet2/1/0/3
 port link-type trunk
 port trunk allow-pass vlan 3
#
interface GigabitEthernet1/1/0/4
 eth-trunk 10
#
interface GigabitEthernet2/1/0/4
 eth-trunk 10
#
return

PE configuration file

#
 sysname PE
#
interface Eth-Trunk10
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet1/0/1
 eth-trunk 10
#
interface GigabitEthernet1/0/2
 eth-trunk 10
#
return

Switch1 configuration file

#
 sysname Switch1
#
 vlan batch 2
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 2
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 2
#
return

Switch2 configuration file

#
 sysname Switch2
#
 vlan batch 3
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 3
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 3
#
return

Enterprise

Huawei Cloud

Carrier

Consumer

Corporate

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.

Networking Requirements

Configuration Roadmap

Procedure

Configuration Files

Related Version

Related Documents

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