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3.4.2. Requirements and Verification

Verification:
Switch# show etherchannel summary
Flags:  D - down        P - bundled in port-channel
        U - in use      s - suspended
        I - stand-alone

Number of channel-groups in use: 1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(SU)       LACP        Gi0/1(P)    Gi0/2(P)

Switch# show etherchannel port-channel
EtherChannel Requirements:
  • Same speed and duplex on all ports
  • Same VLAN configuration (access or trunk)
  • Same allowed VLANs on trunks
  • Same native VLAN on trunks
  • Same STP port cost

⚠️ Exam Trap: If EtherChannel members have mismatched configurations, they won't bundle. Use show etherchannel summary to check for ports in suspended (s) or stand-alone (I) state.