Example for Configuring an Inter-Chassis Eth-Trunk Interface to Forward Traffic Preferentially Through Local Member Interfaces(Stack)
Networking Requirements
On the network shown in Figure 1, Switch 3 and Switch 4 are connected through CSS cables to increase the total capacity. The two switches are considered as one logical switch. To improve reliability, physical interfaces on the two switches are added to an Eth-Trunk interface. When the network runs properly, check member interface information on PE. 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 and reduces traffic forwarding efficiency.
To improve traffic forwarding efficiency, traffic from VLAN 2 should be forwarded through GE 1/0/1 and traffic from VLAN 3 should be forwarded through GE1/0/2. To achieve this goal, configure the Eth-Trunk interface to forward traffic preferentially through the local member interface.
Figure 1 Preferentially forwarding traffic through the local member interface
Configuration Roadmap
The configuration roadmap is as follows:
1. Create an Eth-Trunk interface.
2. Add member interfaces to the Eth-Trunk interface.
NOTE: An interface is added to VLAN1 by default. To avoid broadcast strom, shut down the interface or remove the interface from VLAN1 before adding it to an Eth-Trunk interface.
3. Configure the Eth-Trunk interface to forward traffic preferentially through the local member interface.
4. Configure the Layer 2 forwarding function.
Procedure
1. Create an Eth-Trunk interface and configure the Eth-Trunk interface to allow packets 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
2. Add member interfaces to the Eth-Trunk interface.
# Configure the CSS.
[CSS] interface gigabitethernet 1/0/4
[CSS-GigabitEthernet1/0/4] eth-trunk 10
[CSS-GigabitEthernet1/0/4] quit
[CSS] interface gigabitethernet 2/0/4
[CSS-GigabitEthernet2/0/4] eth-trunk 10
[CSS-GigabitEthernet2/0/4] 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
3. In the CSS view, configure the Eth-Trunk interface to forward traffic preferentially through the local member interface.
[CSS] interface eth-trunk 10
[CSS-Eth-Trunk10] local-preference enable
[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 message "Error: The local preferential forwarding mode has been configured." is displayed.
4. Configure the Layer 2 forwarding function.
# Configure the CSS.
[CSS] vlan batch 2 3
[CSS] interface gigabitethernet 1/0/3
[CSS-GigabitEthernet1/0/3] port link-type trunk
[CSS-GigabitEthernet1/0/3] port trunk allow-pass vlan 2
[CSS-GigabitEthernet1/0/3] quit
[CSS] interface gigabitethernet 2/0/3
[CSS-GigabitEthernet2/0/3] port link-type trunk
[CSS-GigabitEthernet2/0/3] port trunk allow-pass vlan 3
[CSS-GigabitEthernet2/0/3] quit
# Configure Switch 1.
<HUAWEI> system-view
[HUAWEI] sysname Switch1
[Switch1] vlan 2
[Switch1-vlan2] quit
[Switch1] interface gigabitethernet 0/0/1
[Switch1-GigabitEthernet0/0/1] port link-type trunk
[Switch1-GigabitEthernet0/0/1] port trunk allow-pass vlan 2
[Switch1-GigabitEthernet0/0/1] quit
[Switch1] interface gigabitethernet 0/0/2
[Switch1-GigabitEthernet0/0/2] port link-type trunk
[Switch1-GigabitEthernet0/0/2] port trunk allow-pass vlan 2
[Switch1-GigabitEthernet0/0/2] quit
# Configure Switch 2.
<HUAWEI> system-view
[HUAWEI] sysname Switch2
[Switch2] vlan 3
[Switch2-vlan3] quit
[Switch2] interface gigabitethernet 0/0/1
[Switch2-GigabitEthernet0/0/1] port link-type trunk
[Switch2-GigabitEthernet0/0/1] port trunk allow-pass vlan 3
[Switch2-GigabitEthernet0/0/1] quit
[Switch2] interface gigabitethernet 0/0/2
[Switch2-GigabitEthernet0/0/2] port link-type trunk
[Switch2-GigabitEthernet0/0/2] port trunk allow-pass vlan 3
[Switch2-GigabitEthernet0/0/2] quit
5. Verify the configuration.
Run the display trunkmembership eth-trunk command in any view to check information about Eth-Trunk member interface.
The output 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 GigabitEthernet1/0/4, valid, operate up, weight=1
Interface GigabitEthernet2/0/4, valid, operate up, weight=1
Configuration Files
Configuration file the CSS
#
sysname CSS
#
vlan batch 2 3
#
interface Eth-Trunk10
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet1/0/3
port link-type trunk
port trunk allow-pass vlan 2
#
interface GigabitEthernet2/0/3
port link-type trunk
port trunk allow-pass vlan 3
#
interface GigabitEthernet1/0/4
eth-trunk 10#
interface GigabitEthernet2/0/4
eth-trunk 10
#
return
Configuration file of the PE
#
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
Configuration file of Switch 1
#
sysname Switch1
#
vlan batch 2
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2
#
returnConfiguration file of Switch 2
#
sysname Switch2
#
vlan batch 3
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 3#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 3
#
return
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