Cisco Systems 3750E Configuring the Lacp Port Priority, Lacp port-priority priority, Internal

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.

	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	Verify your entries.
	or
	show lacp [channel-group-number]
	internal
Step 6
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To return the LACP port priority to the default value, use the no lacp port-priorityinterface configuration command.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
37-22	OL-9775-02