Cluster interconnect link down in a two-node switchless cluster

Applies to

• FAS systems
• AFF systems
• Two-node switchless cluster

Issue

• The cluster ports are connected to each other in a two-node switchless cluster, as shown in the below example:
  • Node-1 e0a  <-> Node-2 e0a
  • Node-1 e0b  <-> Node-2 e0b
• In this scenario, if one of the cluster ports goes down on one node, then that cluster interconnect link goes down on both the nodes at the same time. This causes the node to disconnect with the cluster.

For Example:

Tue Jul 27 02:24:18 IST [Node-1: kernel: netif.linkDown:info]: Ethernet e0a: Link down, check cable.
Tue Jul 27 02:24:21 IST [Node-1: vifmgr: vifmgr.portdown:notice]: A link down event was received on node Node-1, port e0a.
Tue Jul 27 02:24:24 IST [Node-1: vifmgr: vifmgr.clus.linkdown:EMERGENCY]: The cluster port e0a on node Node-1 has gone down unexpectedly
                         
Tue Jul 27 02:24:18 IST [Node-2: kernel: netif.linkDown:info]: Ethernet e0a: Link down, check cable.
Tue Jul 27 02:24:21 IST [Node-2: vifmgr: vifmgr.portdown:notice]: A link down event was received on node Node-2, port e0a.
Tue Jul 27 02:24:25 IST [Node-2: vifmgr: vifmgr.clus.linkdown:EMERGENCY]: The cluster port e0a on node Node-2 has gone down unexpectedly.

• The cluster LIFs hosted on the down cluster ports will be moved to the redundant cluster ports on both nodes.

For Example:

Tue Jul 27 02:24:24 IST [Node-1: vifmgr: vifmgr.lifsuccessfullymoved:notice]: LIF Node-1_clus1 (on virtual server 5432198765), IP address 169.X.X.X, is now hosted on node Node-1, port e0b.
Tue Jul 27 02:24:25 IST [Node-2: vifmgr: vifmgr.lifsuccessfullymoved:notice]: LIF Node-2_clus1 (on virtual server 5432198765), IP address 169.X.X.X, is now hosted on node Node-2, port e0b.