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Catalyst 6500 Series Switch Command Reference—Release 8.4
OL-6244-01
Chapter 2 Catalyst 6500 Series Switch and ROM Monitor Commands
show channelprotocol
show channelprotocol
To display the channeling protocol used by each module in the system, use the show channelprotocol
command.
show channelprotocol
Syntax Description This command has no arguments or keywords.
Defaults This command has no default settings.
Command Types Switch command.
Command Modes Normal.
Usage Guidelines PAgP and LACP manage channels differently. When all the ports in a channel get disabled, PAgP
removes them from its internal channels list; show commands do not display the channel. With LACP,
when all the ports in a channel get disabled, LACP does not remove the channel; show commands
continue to display the channel even though all its ports are down. To determine if a channel is actively
sending and receiving traffic with LACP, use the show port command to see if the link is up or down.
LACP does not support half-duplex links. If a port is in active or passive mode and becomes half duplex,
the port is suspended (and a syslog message is generated). The port is shown as “connected” using the
show port command and as “not connected” using the show spantree command. This discrepancy
occurs because the port is physically connected, but it never joined spanning tree. If you set the duplex
to full or set the channel mode to off for the port, the port will join spanning tree
For more information about PAgP and LACP, refer to the “Guidelines for Port Configuration” section of
the “Configuring EtherChannel” chapter of the Catalyst 6500 Series Switch Software Configuration
Guide.
Examples This example shows how to display the protocol used by each module in the system:
Console> show channelprotocol
Channel
Module Protocol
------ --------
1 LACP
2 LACP
3 PAGP
4 LACP
Console>