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LACP port down with partial status due to mismatched peer system IDs

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • Link Aggregation Control Protocol (LACP)
  • Interface Groups (ifgrps)

Issue

  • One or more interfaces are not active in an ifgrp with LACP
  • ifconfig -v indicates multiple system IDs on different ports in the same ifgrp

Example:

  • The LACP peer is sending two different system IDs (AA-BB-CC-DD-EE-FF vs FF-EE-DD-CC-BB-AA)
  • Leaving only one interface in the ifgrp in the ACTIVE state

::> system node run -node <node> -command ifconfig -v

a0a: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000
options=6407bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,LRO,VLAN_HWTSO>
ether 02:a0:98:11:22:33
media: Ethernet autoselect
status: active
groups: lagg
laggproto lacp lagghash l3
lagg options:
flags=11<USE_FLOWID,LACP_STRICT>
flowid_shift: 16
lagg statistics:
active ports: 1 <-- Only one out of the two configured port is currently active in the ifgrp
flapping: 0
lag id: [(8000,02-A0-98-11-22-33,0032,0000,0000),
(8000,AA-BB-CC-DD-EE-FF,0037,0000,0000)]
laggport: e0d flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> state=3d<ACTIVITY,AGGREGATION,SYNC,COLLECTING,DISTRIBUTING>
[(8000,02-A0-98-11-22-33,0032,8000,0006),          <-- ontap
(8000,AA-BB-CC-DD-EE-FF,0037,8000,00B9)]           <-- peer
input/output LACPDUs: 460 / 14099
laggport: e0c flags=18<COLLECTING,DISTRIBUTING> state=3d<ACTIVITY,AGGREGATION,SYNC,COLLECTING,DISTRIBUTING>
[(8000,02-A0-98-11-22-33,0032,8000,0007),          <-- ontap
(8000,FF-EE-DD-CC-BB-AA,0037,8000,043A)]           <-- peer
input/output LACPDUs: 460 / 14099

 

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