VCS Heartbeats must be on separate VLANs

It’s not entirely clear from the documentation, but Veritas Cluster heartbeat links need to be on separate VLANs. They mention the requirement of different switches, but say nothing about VLANs. Do not use one big VLAN for all your private heartbeat links – you need two. Your different clusters can share these two VLANs, but if you have two heartbeat connections for your cluster, they need to be isolated from each other in hardware or in VLANs. If you do put them on the same VLAN or cross your links so they can see each other, you’ll get something like:

Dec 11 16:39:20 server llt: [ID 525299 kern.notice] LLT WARNING V-14-1-10497 crossed links? link 0 and link 1 of node 0 on the same network