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RE: CARP and switches
This question never comes to my mind but here is what I can tell you
on CARP in fail-over mode. The switch is not seeing the same "virtual"
MAC address on two ports, it using only seeing "virtual" MAC address
moving from one port to another when a failover occurs.
CARP is done trough Virtual Router Redundancy Protocol (multicast
see http://en.wikipedia.org/wiki/VRRP for some deeper explanation. carp(4)
contains interesting information.
Hope this helps,
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