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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 37 Configuring EtherChannels and Link-State Tracking
Configuring EtherChannels
Configuring the LACP Port Priority
By default, all ports use the same port priority. If the local system has a lower value for the system
priority and the system ID than the remote system, you can affect which of the hot-standby links become
active first by changing the port priority of LACP EtherChannel ports to a lower value than the default.
The hot-standby ports that have lower port numbers become active in the channel first. You can use the
show etherchannel summary privileged EXEC command to see which ports are in the hot-standby
mode (denoted with an H port-state flag).
Note If LACP is not able to aggregate all the ports that are compatible (for example, the remote system might
have more restrictive hardware limitations), all the ports that cannot be actively included in the
EtherChannel are put in the hot-standby state and are used only if one of the channeled ports fails.
Beginning in privileged EXEC mode, follow these steps to configure the LACP port priority. This
procedure is optional.
To return the LACP port priority to the default value, use the no lacp port-priority interface
configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to be configured, and enter interface configuration
mode.
Step 3
lacp port-priority priority Configure the LACP port priority.
For priority, the range is 1 to 65535. The default is 32768. The lower the
value, the more likely that the port will be used for LACP transmission.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config
or
show lacp [channel-group-number]
internal
Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.