I quoted from the OpenBSD FAQ: > net.inet.carp.preempt Allow hosts within a redundancy group > that have a better advbase and advskew > to preempt the master. In addition, this > option also enables failing over a group > of interfaces together in the event that > one interface goes down. If one physical > CARP-enabled interface goes down, CARP > will increase the demotion counter, > carpdemote, by 1 on interface groups that > the carp(4) interface is a member of, in > effect causing all group members to fail- > over together. > > I did establish an interface group for my two CARP interfaces, but I did > not do my failover tests while it was in that state. As I said, I clearly > need to re-do my tests.
I re-did my tests this morning, and yes indeed, both CARP interfaces in the CARP group switch automatically between the BACKUP and MASTER states when I do abusive things to one of the connections. I say "automatically" instead of "simultaneously" because there was a bit of a delay while the reconnected link negotiated speed. I blame Cisco for that. Thanks for all the assistance, I found this exchange to be quite helpful. --Kyle
