Etherchannel – suspended port state

I’ve seen a few suspended ports in etherchannels lately. Not everyone is familiar with this port status. So let’s take a minute to talk about this:

There is one important rule when configuring etherchannels: All interfaces in the etherchannel need the same speed and duplex settings, trunking encapsulation (dot1q/isl) or the same access VLAN in case of an access port, same STP cost and last but not least: no etherchannel port can be configured in a monitor session (SPAN port).