Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

pagp learn-methodChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS Commandspagp learn-methodUse the pagp learn-method interface configuration command on the switch stack or on a standaloneswitch to learn the source address of incoming packets received from an EtherChannel port. Use the noform of this command to return to the default setting.pagp learn-method {aggregation-port | physical-port}no pagp learn-methodSyntax Descriptionaggregation-portphysical-portSpecify address learning on the logical port-channel. The switch sendspackets to the source using any of the ports in the EtherChannel. This settingis the default. With aggregate-port learning, it is not important on whichphysical port the packet arrives.Specify address learning on the physical port within the EtherChannel. Theswitch sends packets to the source using the same port in the EtherChannelfrom which it learned the source address. The other end of the channel usesthe same port in the channel for a particular destination MAC or IP address.DefaultsThe default is aggregation-port (logical port channel).Command ModesInterface configurationCommand HistoryRelease12.2(35)SE2ModificationThis command was introduced.Usage GuidelinesThe learn method must be configured the same at both ends of the link.NoteThe switch supports address learning only on aggregate ports even though the physical-port keyword isprovided in the command-line interface (CLI). The pagp learn-method and the pagp port-priorityinterface configuration commands have no effect on the switch hardware, but they are required for PAgPinteroperability with devices that only support address learning by physical ports, such as theCatalyst 1900 switch.When the link partner to the switch is a physical learner, we recommend that you configure the switchas a physical-port learner by using the pagp learn-method physical-port interface configurationcommand and to set the load-distribution method based on the source MAC address by using theport-channel load-balance src-mac global configuration command. Use the pagp learn-methodinterface configuration command only in this situation.2-412Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08