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Hi @RayP,
On an interface, a CCP (Cluster Conection Protocol) packet is sent every 100ms on the highest and lowest VLAN in both directions. ClusterXL detects whether the neighboring interface can be reached. After four lost CCP packets (400ms) the cluster status goes into error mode (interface error) .
If the interface is shown as down with "cphaprob -a if ", the two VLANs do not see each other gateway interface on the network. I think you have a layer 2 (ethernet or VLAN) problem between the two gateways on the switch. The same can be said for a LACP Bond.
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