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> I've seen a similar delay in failover when using cisco routers. They
> don't update the internal MAC address table after receiving gratuitous
> arp packets during an LVS director failover event. I don't
> know if the
> heartbeat package uses arps to fail over, but keepalived does. Cisco
> routers seem to need icmp packets before they'll update the
> MAC address
> table. For LVS, the problem here is that the router continues to send
> traffic to the VIP at the master's hw address instead of
> shifting to the backup's hw address.
Heartbeat sends out quite a few gratuitous arps. They are very good about
it. Only a misconfigured switch or an extremely crappy switch wouldn't
respond to the arps that heartbeat sends out. Another possibility here is a
firewall or misconfigured linux is blocking the arps.
As Horms said, the best way to figure out what is going on is through the
use of tcpdump from a few points of presence on your network. Logging in to
the switch to see what the arp entries are before and after failover is also
not a bad idea.
P
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