[c-nsp] Verify static route next hop

[Adrian Chadd]

What you want is "Reliable Static Routing Backup Using Object Tracking"

http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/products_feature_guide09186a00801d862d.html

* setup an SLA to ICMP ECHO ping an IP
* setup a "tracking object" to track an SLA entry
* setup a default route to only trigger when that "tracking object" is active

Works a treat. Remember that ICMP ECHO to a connected interface might
succeed if the connected interface goes down and you can reach the other
end via another path. Use source interfaces in your SLA IpIcmpEcho entries
and you should be fine.

Adrian


On Fri, Oct 05, 2007, Kevin Barrass wrote:
>  
> Hi
> 
> Iam looking into a problem where we have no option other than to use
> static routes for political reasons ;0)
> Unfortunatly our core network between layer 3 devices is a switched
> ethernet backbone.
> 
> The problem we have is that if a next hop of a static route goes down
> the static route stays valid as the outgoing interface to the next hop
> is up.
> 
> I was told that using the command "ip route static adjust-time" there is
> some internal feature in IOS that checks the availability of the next
> hop IP address but in testing this does not work. Can anyone advise if I
> have miss read the below document.
> 
> http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_
> guide09186a00802801fe.html