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.
NOTE:For details about software mappings, visit Hardware Query Tool and search for the desired product model.
Networking Requirements
On the network shown in Figure 6-8, 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.
Configuration Roadmap
The configuration roadmap is as follows:
Create an Eth-Trunk.
Add member interfaces to the Eth-Trunk.
Enable the Eth-Trunk to preferentially forward local traffic.
Add interfaces to VLANs to implement Layer 2 connectivity.
Procedure
- 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
- 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
- Configure the Eth-Trunk on devices in the CSS to preferentially forward local traffic.
[CSS] interface eth-trunk 10[CSS-Eth-Trunk10] local-preference enable //Enable Eth-Trunk 10 to preferentially forward local traffic.[CSS-Eth-Trunk10] quit
NOTE: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." - 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
- 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
Product | Product Model | Software Version |
|---|---|---|
S2700 | S2720EI | V200R006C10, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00 |
S2750EI | V200R003C00, V200R005C00SPC300, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00 | |
S5700 | S5700LI | 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 | |
S5700SI | V200R002C00, V200R003C00, V200R005C00 | |
S5700EI | V200R002C00, V200R003C00, V200R005(C00&C01&C02&C03) | |
S5710EI | V200R003C00, V200R005(C00&C02) | |
S5720EI | V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
S5720LI and S5720S-LI | V200R010C00, V200R011C00, V200R011C10, V200R012(C00&C20), V200R013C00 | |
S5720SI and S5720S-SI | V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
| S5720I-SI | V200R012C00, V200R013C00 | |
S5700HI | V200R003C00, V200R005(C00SPC500&C01&C02) | |
S5710HI | V200R005C03 | |
S5720HI | V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
| S5730HI | V200R012C00, V200R013C00 | |
S5730SI | V200R011C10, V200R012C00, V200R013C00 | |
S5730S-EI | V200R011C10, V200R012C00, V200R013C00 | |
S6700 | S6700EI | V200R003C00, V200R005(C00&C01) |
S6720EI | V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
S6720S-EI | V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
S6720LI, S6720S-LI | V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
S6720SI, S6720S-SI | V200R011C00, V200R011C10, V200R012C00, V200R013C00 | |
S6720HI | V200R012C00, V200R013C00 | |
S7700 | S7706 and S7712 | V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00 |
| S7706 PoE | V200R013C00 | |
S9700 | S9706 and S9712 | V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00 |
See more please click
