Cisco WS-C3560E-48PD-SF Command Reference - Page 318
pagp learn-method
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pagp learn-method Chapter 2 Catalyst 3560 Switch Cisco IOS Commands pagp learn-method Use the pagp learn-method interface configuration command to learn the source address of incoming packets received from an EtherChannel port. Use the no form of this command to return to the default setting. pagp learn-method {aggregation-port | physical-port} no pagp learn-method Syntax Description aggregation-port physical-port Specify address learning on the logical port-channel. The switch sends packets to the source using any of the ports in the EtherChannel. This setting is the default. With aggregate-port learning, it is not important on which physical port the packet arrives. Specify address learning on the physical port within the EtherChannel. The switch sends packets to the source using the same port in the EtherChannel from which it learned the source address. The other end of the channel uses the same port in the channel for a particular destination MAC or IP address. Defaults The default is aggregation-port (logical port channel). Command Modes Interface configuration Command History Release 12.1(19)EA1 Modification This command was introduced. Usage Guidelines The learn method must be configured the same at both ends of the link. Note The Catalyst 3560 switch supports address learning only on aggregate ports even though the physical-port keyword is provided in the command-line interface (CLI). The pagp learn-method and the pagp port-priority interface configuration commands have no effect on the switch hardware, but they are required for PAgP interoperability with devices that only support address learning by physical ports, such as the Catalyst 1900 switch. When the link partner to the Catalyst 3560 switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command and to set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command. Use the pagp learn-method interface configuration command only in this situation. 2-286 Catalyst 3560 Switch Command Reference 78-16405-05