Hi,
I am currently revising a pair of openbsd routers we are running (and
btw running them quite happily for a while now!).
These routers have two interfaces, em0 and em1, which are each connected
to different switches (ie. em0 of both machines to switch1 and em1 to
switch2).
em0 hosts all upstreams to which the routers are connected to - no carp
interfaces here.
em1 hosts all internal subnets, which are split across approx. 10 vlan
interfaces. These vlan interfaces are "carped" between the two boxes -
one carp interface per vlan interface.
Both boxes have net.inet.carp.preempt set to 1
Each carp interface has a different vhid
If I do a _ifconfig carp1 down_ on the master, the backup switches to
master for carp1, while carp2,carp3,carp4,etc. remain master on the
first machine.
Ideally - I guess - since all the mentioned carp interfaces share a
physical interface, I would want the backup machine to switch into
master state for all carp interfaces on em1, and not only one.
If I understand the documentation on carp's vhid correctly, interfaces
sharing the same vhid, share the same virtual MAC address, and, in turn,
if one of them fails or is being shutdown, all interfaces with the same
vhid are being "transferred" to the backup machine.
Is this correct?
Are there any good reasons for not sharing the same vhid across all carp
interfaces in the described scenario?
...I would happily try it out myself, but these boxes are in a somewhat
mission critical state, so I'd rather not just try and see what happens :)
Thanks for your help!
Best
Philipp
