pagp learn-method
To learn the source address of incoming packets received from an EtherChannel port, use the pagp
learn-method command in interface configuration mode. To return to the default setting, use the no form of
this command.
pagp learn-method {aggregation-port| physical-port}
no pagp learn-method
Syntax Description
Specifies address learning on the logical port channel. The switch sends packets to
the source using any port in the EtherChannel. This setting is the default. With
aggregation-port learning, it is not important on which physical port the packet arrives.
aggregation-port
Specifies 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.
physical-port
Command Default
The default is aggregation-port (logical port channel).
Command Modes
Interface configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS 15.0(2)EX
Usage Guidelines
The learn method must be configured the same at both ends of the link.
The 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. .
When the link partner to the 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. We
also recommend that you 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.
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
OL-29043 -01 49
Layer 2 Commands
pagp learn-method
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