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Cannot bring up an EtherChannel when a Catalyst 2900XL or 3500XL is connected to another switch
An incorrect channel mode configuration on a switch connected to a Catalyst 2900XL or 3500XL switch results in the inability to bring up an EtherChannel.
The Catalyst 2900XL and 3500XL switches do not support Port Aggregation Protocol (PAgP) or Link Aggregate Control Protocol (LACP). Therefore, the channel mode of the connected devices must be set to on mode in order for a channel to come up. If the channel mode on the connected switch is set to the default value of auto or desirable, the channel does not come up.
To verify the channel mode on the connected switch, issue these commands: