Description

mc-ae lacp stats stuck in waiting state on both MC-lag peer.

SW1> show lacp interfaces ae0
Aggregated interface: ae0
    LACP state:           Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      xe-0/0/1           Actor    No    No    No   No   No   Yes     Fast    Active
      xe-0/0/1        Partner    No    No    No   No  Yes   Yes     Fast    Active
    LACP protocol:        Receive State  Transmit State          Mux State
      xe-0/0/1                  Current   Fast periodic            Waiting

SW2> show lacp interfaces ae0
Aggregated interface: ae0
    LACP state:           Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      xe-0/0/1           Actor    No    No    No   No   No   Yes     Fast    Active
      xe-0/0/1         Partner    No    No    No   No  Yes   Yes     Fast    Active
    LACP protocol:        Receive State  Transmit State          Mux State
      xe-0/0/1                  Current   Fast periodic            Waiting


 
Symptoms
Local and Peer both status display standby


SW1> show interfaces mc-ae id 100
 Member Link                  : ae0
 Current State Machine's State: mcae standby state
 Configuration Error Status   : vlan membership
 Local Status                 : standby
 Local State                  : up
 Peer Status                  : standby
 Peer State                   : up
     Logical Interface        : ae0.0
     Topology Type            : bridge
     Local State              : up
     Peer State               : up
     Peer Ip/MCP/State        : 10.10.10.1 ae1.0 up

SW2> show interfaces mc-ae id 100
 Member Link                  : ae0
 Current State Machine's State: mcae standby state
 Configuration Error Status   : vlan membership
 Local Status                 : standby
 Local State                  : up
 Peer Status                  : standby
 Peer State                   : up
     Logical Interface        : ae0.0
     Topology Type            : bridge
     Local State              : up
     Peer State               : up
     Peer Ip/MCP/State        : 10.10.10.2 ae1.0 up


Solution
 


  • "set multi-chassis mc-lag consistency-check" config was missing on mc-lag peer
  • Issue is resolved post, adding the command to second mc-lag peer

    set multi-chassis mc-lag consistency-check
    

Modification History
2026-08-06 : Article Created