On 10/24/2012 08:12 AM, Peter Rathlev wrote:
On Tue, 2012-10-23 at 19:15 +0100, Phil Mayers wrote:
HSRPv6 gives you access to the "track" stuff which can be useful to have
more explicit control over how you failover and when.
Right, that's a rather good point.
I should have added: we have used dual RAs in a couple of places where
HSRPv2 isn't available (old-skool 3750s). We found it unsatisfactory
primarily due to the lack of control. But we didn't use the kind of
aggressive timers you describe, to be fair.
It's interesting that the IPv6 spec specifies that stacks will perform
router reachablity detection using upper-layer feedback (if you sent a
TCP data packet via gateway X and got an ACK, gateway X is up). This
ought in theory to give gateway failover quickly without any upstream
intervention or short timers. Sadly, that wasn't the case when we tested
it :o(
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