Pagp Port-Priority - Cisco Catalyst 3550 Command Reference Manual

Chapter 2 Cisco IOS Commands

pagp port-priority

Use the pagp port-priority interface configuration command to select an interface over which all Port
Aggregation Protocol (PAgP) traffic through the EtherChannel is sent. If all unused interfaces in the
EtherChannel are in hot-standby mode, they can be placed into operation if the currently selected
interface and link fail. Use the no form of this command to return to the default setting.
Syntax Description
priority
Defaults
The default value is 128.
Command Modes
Interface configuration
Command History Release
12.1(4)EA1
Usage Guidelines
The physical port with the highest priority that is operational and has membership in the same
EtherChannel is the one selected for PAgP transmission.
Note The Catalyst 3550 supports address learning only on aggregate ports even though the physical-port
keyword is provided in the 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 3550 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.
Examples This example shows how to set the port priority to 200:
Switch(config-if)# pagp port-priority 200
You can verify your setting by entering the show running-config privileged EXEC command or the
show pagp channel-group-number internal privileged EXEC command.
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pagp port-priority priority
no pagp port-priority
A priority number ranging from 0 to 255.
Modification
This command was first introduced.
Catalyst 3550 Multilayer Switch Command Reference
pagp port-priority
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