backup routing

[sasso]

customer has vpn carrying data traffic between sites. 17xx - pix 5xx each side. another t1 point to point between sites carries packetized voice traffic only. 2 26xx's connected to pbx's with nortel ITG cards on either side. customer wants to fial over to voip t1 when vpn fails. ospf with floating static route? get it through pix?

simpler way? don't really want to introduce routing protocol if unnecessary since all routes are currently static.

[vcjones]

You do need to introduce a routing protocol, because the VPN will never go down at the physical layer. There are two examples of VPN failover configurations in a white paper on my website.

Be aware that unless you use BGP for your routing protocol, you will need to run the routing protocol through a GRE tunnel in order to make the two routers look "adjacent" for broadcast/multicast hello message exchanges.

Another option if you enjoy living on the bleeding edge, is to use "ping based routing" to detect loss of Internet or VPN connectivity and have that drive your alternate route. Just be aware that you won't have a GD solution with that approach until IOS 12.4 matures.

Good luck and have fun!

Vincent C Jones

www.networkingunlimited.com