Configure the LACP System Priority

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本文介绍如何在两台交换机上配置Port Channel，包括启用Port Channel、设置物理端口模式、配置LACP系统及端口优先级等步骤。

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In the following example, all of the ports in both switches are configured to belong to port channel 1. Ports 0/1, 0/2, and 0/3 are part of the LA. Unless otherwise noted, you must perform all of the commands in the following procedure on both switches.

Enable port channeling, and create the port channel (1 in this example).

SEFOS# configure terminal
SEFOS(config)# set port-channel enable
SEFOS(config)# interface port-channel 1
SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit

Configure the physical ports, and set the mode for each of the interfaces.

SEFOS(config)# interface extreme-ethernet 0/1
SEFOS(config-if)# no shutdown
SEFOS(config-if)# channel-group 1 mode active
SEFOS(config-if)# exit
SEFOS(config)# interface extreme-ethernet 0/2
SEFOS(config-if)# no shutdown
SEFOS(config-if)# channel-group 1 mode active
SEFOS(config-if)# exit
SEFOS(config)# interface extreme-ethernet 0/3
SEFOS(config-if)# no shutdown
SEFOS(config-if)# channel-group 1 mode active
SEFOS(config-if)# exit
SEFOS(config-if)# end

Review the etherchannel information on both switches to ensure that all of the ports have been added to the port channel.
The output on both switches should be the same.
```
SEFOS# show etherchannel 1 detail
```
Note - Before you configure the LACP system priority, note that the extreme-ethernet port, 0/3, is the standby port in both switch A and switch B.
Set the LACP system priority in switch B.
```
SEFOS# configure terminal
SEFOS(config)# lacp system-priority 20
```
The values for the priority range from 0 to 65535. The lower the value, the higher the system priority. The switch with the lower system priority value determines the links between the LACP partner switches that are in active and standby states for each LACP port channel.

Configure the LACP port priority for port 0/3 in switch A.

SEFOS(config)# interface extreme-ethernet 0/3
SEFOS(config-if)# lacp port-priority 20
SEFOS(config-if)# end

Review the etherchannel information.
The output in the following examples has been truncated to show the relevant information. In this procedure, the output is different for each switch.
```
SEFOS# show etherchannel 1 detail
```
The relevant output in switch A should be:
```
...
LACP System Priority: 32768
...
```
The relevant output in switch B should be:
```
...
LACP System Priority: 20
...
```
Note - After you configure the LACP system priority, note that the extreme-ethernet port, 0/3, in switch A and switch B continue to be standby ports. The port priority for port 0/3 in switch A does not take effect because the system priority of switch A is less than the system priority of switch B.