We're noticing we are getting a high number of discards on our LAGs and member ports of the LAGs that are in the Alt or Backup state. Of course this is to be expected as they are discarding packets. However, it got me thinking as perhaps I have RSTP configured incorrectly. Between our switches (6224s) we have 4 ports assigned to a port-channel (LAG) and the port-channel is a trunk port. The question is, should I set the member ports of the LAG to portfast and then leave RSTP on on the port channel interface? Or should RSTP be on for both the port-channel interface AND the member interfaces?
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