standby default route

[josephschung]

We have a 3750 stack in site A, by static route, it points all incoming and outgoing traffice to the firewall in site B for security reason.

But, if the inter-site link is down, the default route will not be available. Thus, I think I need another default route, which points to the local site LAN in case the inter-site link is down. Can I give the standby default route a higher distance metric to build up the "HA" of the two default routes? Or is there a better idea?

Thanks!

[Philip Ratzsch]

Joseph,

Perhaps http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html#wp1087713 is what you're looking for - look at the 'ip route' section and take a peek at the bit about object tracking.  Essentially, it allow a static route to be installed only if say, a link is up or something along those lines.

Regards,

Philip Ratzsch

[mrdogantr · Accepted solution]

Hi,

    You can use default route with different metric or ip sla. 

ip route 0.0.0.0 0.0.0.0 {gw1} 10

ip route 0.0.0.0 0.0.0.0 {gw2} 20

or

ip sla 10

icmp-echo {branch office ip}

timeout 1000

frequency 3

ip sla schedule 10 life forever start-time now

track 10 ip sla 10 reachability

ip route {branch office ip} 255.255.255.255 {gw1}

ip route 0.0.0.0 0.0.0.0 {gw1} track 10

ip route 0.0.0.0 0.0.0.0 {gw2} 20

hth

Muammer