Ccna 00-301, Volume Official

etherchannel summary command as listed in Example 17-14. Note in particular that it lists 

a flag legend for characters that identify key operational states, such as whether a port is 

bundled (included) in the PortChannel (P) and whether it is acting as a routed (R) or switched 

(S) port.

Example 17-14

  Verifying the EtherChannel

SW1# show etherchannel 12 summary

Flags: D - down        P - bundled in port-channel

       I - stand-alone s - suspended

       H - Hot-standby (LACP only)

       R - Layer3      S - Layer2

       U - in use      f - failed to allocate aggregator

       M - not in use, minimum links not met

       u - unsuitable for bundling

       w - waiting to be aggregated

       d - default port

Number of channel-groups in use: 1

Number of aggregators:           1

Group  Port-channel  Protocol    Ports

------+-------------+-----------+-----------------------------------------------

12     Po12(RU)         -        Gi1/0/13(P) Gi1/0/14(P)