It looks like the underlying problem is possibly with trunk status. One link is 
access and one is trunking, but etherchannel requires that they be the same.

marc abel <[email protected]> wrote:

>I have two dynamic desirable trunks configured as an ether-channel and
>one keeps un-bundling
>
>Nov 20 19:49:06.347: %EC-5-CANNOT_BUNDLE2: Fa0/23 is not compatible
>with Fa0/24 and will be suspended (trunk mode of Fa0/23 is access,
>Fa0/24 is trunk)
>Nov 20 19:49:07.335: %LINEPROTO-5-UPDOWN: Line protocol on Interface
>FastEthernet0/23, changed state to down
>
>
>It then comes back up and everything seems fine for a bit and then it
>happens again. Any idea what the issue could be or how to
>troubleshoot? Obviously I could configure them as statically trunking
>but a lab requirement prevents this.
>
>Thank you,
>
>Marc
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