[c-nsp] Supervisor Failover - Speed question

[Geoffrey Pendery]

Yes, failover shouldn't take 2-3 minutes.  I've personally observed it
as less than one second in several test environments.  But I imagine
it's highly dependent on the details.

What it your criteria for measuring it as done?  Are you pinging from
a host on one port of the chassis to another?  One network to another,
routed across the 7600?  Pinging the supervisor's loopback address?
Looking at routing protocol adjacencies in neighbored routers?

As others have mentioned, if you're running a routing protocol like
EIGRP or OSPF, adding "nsf" in the config for that protocol will
likely help to maintain forwarding during the failover, though not
technically speeding up the failover itself.

Could you elaborate a bit on what traffic you're seeing down for a few minutes?


-Geoff


On Wed, Apr 8, 2009 at 6:44 PM, Paul Stewart <paul at paulstewart.org> wrote:
> Hi there.
>
>
>
> We have 7606's with dual Sup720-3BXL.  I'm investigating how to get the
> fastest possible failover if/when a supervisor fails.
>
>
>
> Current config looks like this:
>
>
>
>       my state = 13 -ACTIVE
>
>     peer state = 8  -STANDBY HOT
>
>           Mode = Duplex
>
>           Unit = Primary
>
>        Unit ID = 5
>
>
>
> Redundancy Mode (Operational) = sso
>
> Redundancy Mode (Configured)  = sso
>
> Redundancy State              = sso
>
>     Maintenance Mode = Disabled
>
>  Communications = Up
>
>
>
>   client count = 78
>
>  client_notification_TMR = 30000 milliseconds
>
>          keep_alive TMR = 9000 milliseconds
>
>        keep_alive count = 0
>
>    keep_alive threshold = 18
>
>           RF debug mask = 0x0
>
>
>
> --
>
>
>
> redundancy
>
>  keepalive-enable
>
>  mode sso
>
>  main-cpu
>
>  auto-sync running-config
>
>
>
>
>
>
>
> Is there any way to get a failover to less than 30 seconds an example?  We
> find currently it's 2-3 minutes for failover it seems..
>
>
>
> Thanks,
>
>
>
> Paul
>
>
>
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