< Home

Example for Configuring an Eth-Trunk to Preferentially Forward Local Traffic in a CSS or Stack

Overview

In a CSS or stack, an Eth-Trunk is configured as the outbound interface of traffic to ensure reliable transmission. Member interfaces of the Eth-Trunk are located on different chassis. When devices in the CSS or stack forward traffic, the Eth-Trunk may select an inter-chassis member interface based on a hash algorithm. The cable bandwidth between devices in the CSS or stack is limited, so inter-chassis traffic forwarding occupies bandwidth resources between devices, lowering traffic forwarding efficiency. To address this issue, you can enable an Eth-Trunk to preferentially forward local traffic.

Configuration Notes

  • If active interfaces of an Eth-Trunk on the local device have sufficient bandwidth to forward traffic, you can configure the Eth-Trunk to preferentially forward local traffic. This improves traffic forwarding efficiency and increases bandwidth capacity between devices in the CSS.
  • If active interfaces of an Eth-Trunk on the local device do not have sufficient bandwidth to forward traffic, you can configure the Eth-Trunk not to preferentially forward local traffic. In this case, some traffic on the local device is forwarded through member interfaces of an Eth-Trunk on another device, preventing packet loss.

  • For applicable product models and versions, see Applicable Product Models and Versions.

    For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Networking Requirements

On the network shown in Figure 1, CSS technology is used to increase the total capacity of switches. Switch3 and Switch4 are connected through stack cables to form a logical switch. To implement backup between switches and improve reliability, physical interfaces on the two switches are added to an Eth-Trunk. In normal situations, traffic from VLAN 2 and VLAN 3 is forwarded through GE1/0/1 and GE1/0/2 respectively. This increases bandwidth capacity between switches and reduces traffic forwarding efficiency.

To ensure that traffic from VLAN 2 is forwarded through GE1/0/1 and traffic from VLAN 3 is forwarded through GE1/0/2, you can configure the Eth-Trunk to preferentially forward local traffic.

Figure 1 Preferentially forwarding local traffic

Configuration Roadmap

The configuration roadmap is as follows:

  1. Create an Eth-Trunk.

  2. Add member interfaces to the Eth-Trunk.

  3. Enable the Eth-Trunk to preferentially forward local traffic.

  4. Add interfaces to VLANs to implement Layer 2 connectivity.

Procedure

  1. Create an Eth-Trunk and configure the ID of a VLAN from which packets can pass through the Eth-Trunk.

    # Configure the CSS.

    <HUAWEI> system-view
[HUAWEI] sysname CSS
[CSS] interface eth-trunk 10 //Create Eth-Trunk 10 and enter the view of Eth-Trunk 10.
[CSS-Eth-Trunk10] port link-type trunk  //Set the link type of the interface to trunk.
[CSS-Eth-Trunk10] port trunk allow-pass vlan all //Configure the interface to allow all VLANs.
[CSS-Eth-Trunk10] quit

    # Configure the aggregation switch PE.

    <HUAWEI> system-view
[HUAWEI] sysname PE
[PE] interface eth-trunk 10 //Create Eth-Trunk 10 and enter the view of Eth-Trunk 10.
[PE-Eth-Trunk10] port link-type trunk //Set the link type of the interface to trunk.
[PE-Eth-Trunk10] port trunk allow-pass vlan all //Configure the interface to allow all VLANs.
[PE-Eth-Trunk10] quit

  2. 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 //Add GE1/1/0/4 to Eth-Trunk 10.
[CSS-GigabitEthernet1/1/0/4] quit
[CSS] interface gigabitethernet 2/1/0/4
[CSS-GigabitEthernet2/1/0/4] eth-trunk 10 //Add GE2/1/0/4 to 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 //Add GE1/0/1 to Eth-Trunk 10.
[PE-GigabitEthernet1/0/1] quit
[PE] interface gigabitethernet 1/0/2 
[PE-GigabitEthernet1/0/2] eth-trunk 10 //Add GE1/0/2 to Eth-Trunk 10.
[PE-GigabitEthernet1/0/2] quit

  3. Configure the Eth-Trunk on devices in the CSS to preferentially forward local traffic.

    On the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S run the following command:

    [CSS] local-preference enable //Enable Eth-Trunk 10 to preferentially forward local traffic.

    On the devices except the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S, run the following commands:

    [CSS] interface eth-trunk 10
[CSS-Eth-Trunk10] local-preference enable //Enable Eth-Trunk 10 to preferentially forward local traffic.
[CSS-Eth-Trunk10] quit

    By default, an Eth-Trunk is enabled to preferentially forward local traffic. If you run the local-preference enable command, the system displays the message "Error: The local preferential forwarding mode has been configured."

  4. Configure Layer 2 forwarding.

    # 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 access switch 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 access switch 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

  5. Verify the configuration.

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

    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

Applicable Product Models and Versions

Table 1 Applicable product models and versions

Product

Product Model

Software Version

S2700

S2720-EI

V200R006C10, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S2750-EI

V200R003C00, V200R005C00SPC300, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5700

S5700-LI

V200R003(C00&C02&C10), V200R005C00SPC300, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5700S-LI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

NOTE:

Only S5700S-28P-PWR-LI-AC, S5700S-28X-LI-AC, and S5700S-52X-LI-AC support this function.

S5710-X-LI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5700-SI

V200R002C00, V200R003C00, V200R005C00

S5700-EI

V200R002C00, V200R003C00, V200R005(C00&C01&C02&C03)

S5710-EI

V200R003C00, V200R005(C00&C02)

S5720-EI

V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5720-LI, S5720S-LI

V200R010C00, V200R011C00, V200R011C10, V200R012(C00&C20), V200R013C00, V200R019C00, V200R019C10

S5720-SI, S5720S-SI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5720I-SI

V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5700-HI

V200R003C00, V200R005(C00SPC500&C01&C02)

S5710-HI

V200R005C03

S5720-HI

V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5730-HI

V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5730-SI

V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5730S-EI

V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S5731-H

V200R013C02, V200R019C00, V200R019C10

S5731-S, S5731S-S

V200R019C00, V200R019C10

S5731S-H

V200R019C00, V200R019C10

S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735S-S

V200R019C10

S5732-H

V200R019C00, V200R019C10

S6700

S6700-EI

V200R003C00, V200R005(C00&C01)

S6720-EI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S6720S-EI

V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S6720-LI, S6720S-LI

V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S6720-SI, S6720S-SI

V200R011C00, V200R011C10, V200R012C00, V200R013C00, V200R019C00, V200R019C10

S6720-HI

V200R012C00, V200R013C00, V200R019C00, V200R019C10

S6730-H

V200R013C02, V200R019C00, V200R019C10

S6730S-H

V200R019C10

S6730-S, S6730S-S

V200R019C00, V200R019C10

S7700

S7706, S7712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00, V200R013C02, V200R019C00, V200R019C10

S7706 PoE

V200R013C00, V200R019C00, V200R019C10

S9700

S9706, S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00
Parent Topic: Link Aggregation Configuration
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
< Previous topic Next topic >