Cisco Systems 3750E Configuring Lacp Hot-Standby Ports, Pagp learn-method physical-port, 37-20

Chapter 37 Configuring EtherChannels and Link-State Tracking

Configuring EtherChannels

Beginning in privileged EXEC mode, follow these steps to configure your switch as a PAgP physical-port learner and to adjust the priority so that the same port in the bundle is selected for sending packets. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Specify the port for transmission, and enter interface
		configuration mode.
Step 3
	pagp learn-method physical-port	Select the PAgP learning method.
		By default, aggregation-port learning is selected, which means
		the switch sends packets to the source by using any of the ports
		in the EtherChannel. With aggregate-port learning, it is not
		important on which physical port the packet arrives.
		Select physical-portto connect with another switch that is a
		physical learner. Make sure to configure the port-channel
		load-balanceglobal configuration command to src-macas
		described in the “Configuring EtherChannel Load-Balancing”
		section on page 37-18.
		The learning method must be configured the same at both ends
		of the link.
Step 4
	pagp port-priority priority	Assign a priority so that the selected port is chosen for packet
		transmission.
		For priority, the range is 0 to 255. The default is 128. The higher
		the priority, the more likely that the port will be used for PAgP
		transmission.
Step 5
	end	Return to privileged EXEC mode.
Step 6
	show running-config	Verify your entries.
	or
	show pagp channel-group-number internal
Step 7
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To return the priority to its default setting, use the no pagp port-priorityinterface configuration command. To return the learning method to its default setting, use the no pagp learn-methodinterface configuration command.

Configuring LACP Hot-Standby Ports

When enabled, LACP tries to configure the maximum number of LACP-compatible ports in a channel, up to a maximum of 16 ports. Only eight LACP links can be active at one time. The software places any additional links in a hot-standby mode. If one of the active links becomes inactive, a link that is in the hot-standby mode becomes active in its place.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
37-20	OL-9775-02