I just set up an L2 port channel for testing purposes to a server using two GigE links. Both of the interfaces are showing up/up and passing traffic, and seem to be load-balancing correctly, but the port-channel interface is showing down/down.
The configuration on both of the physical interfaces is:
switchport mode access
channel-group 2 mode desirable
Any ideas on why the Port-Channel interface is showing down/down?
To clarify further, the configuration on the port channel interface is pretty basic. However, the server that this port channel is going to is a Dell. They specified an Intel program to create a NIC teaming on the server itself. When we use the 802.3AD settings, it does not load-balance correctly. However, when I change the interface over to a PAgP (Cisco proprietary), the links begin to load-balance correctly, but the port-channel interface shows as down.
I think the port-channel interface shows down due to the fact that the interface is trying to negotiate PAgP, but can't because the Intel program on the server is not supporting it.
As for not load-balancing across the two links when using the 802.3ad standard, i'm still not sure.
To verify the channel is working use the show etherchannel detail command to see if the port channel is actually working . show etherchannel summary will also tell you if the channel is actually working . A lot of times when channeling a server you will have to force the channel on instead of negotiating the channel.
I changed the GigE interfaces to the 802.3ad standard and the port-channel interface came up. However, I changed it back to PAgP and forced the interface up and it is still showing down/down on the port-channel interface, but the physical interfaces are still up and passing traffic. the show etherchannel summ command shows:
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