hi! if i;m connecting 1 edge switch to 2 core switches. (2 trunk links, 1 link to each core), how do i configure the etherchannel at the core side? can the same channel id used across the core switches? what's the configuration be like at the core side?
According to your description there would be no etherchannel because you are saying 1 link to each core . You would have a simple trunk to each core . In order to etherchannel you would have to have 2 links to each core. Just a create a simple trunk on each end.