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arron
Beginner

cisco WS-C6506-E Port-Channel 2A

I was about to make some changes on one of our 6500 series switches, and I noticed there is an interface Port-Channell2A. The device shows the following port-channel’s when doing: show ip interface brief:

Port-channel1          unassigned      YES unset  up                    up     

Port-channel2          unassigned      YES unset  down                  down   

Port-channel2A         unassigned      YES unset  up                    up     

Port-channel3          unassigned      YES unset  down                  down   

Here is the output from show run int:

KG-CORE#show run int port-channel 2A

Building configuration...

Current configuration : 5 bytes

end

KG-CORE#show run int port-channel 2

Building configuration...

Current configuration : 202 bytes

interface Port-channel2

switchport

switchport trunk encapsulation dot1q

switchport trunk native vlan 4

switchport trunk allowed vlan 2,4,109,215,255

switchport mode trunk

mls qos trust cos

end

I need to add a vlan and allow access to the new vlan on port-channel1 and 2, but when looking at port-channel 2 it shows the vlan tagging I need to edit, but the port-channel is down. When looking at port-channel 2A the interface is up, but there is no configuration associated with it when doing a show run.

I wanted to see if I could clear this up before making any changes, and was curious of what might have cause this.

1 REPLY 1
dhristov
Cisco Employee

hi Arron,

It means the physical interfaces in the channel are not in-synch or there are members in your LACP bundle that do not have the same config or have capabilities mismatch.

If the inconsitency is cleared you need just to shut/no shutdown the port-channel to renegotiate the Port-channel.

Please can you add information what is the port capablities and the configuration from both sides.

show interface capabilities
show interface trunk
show etherchannel 2 summary
show etherchannel 2 detail

-Dimitar