About float static route ,How can i set the static route ?

huangzhy · ‎10-09-2002

I have two sides interconnected by frame-relay point-to-point interface . On each side ,i use the static route point to the other side by using the command such as "ip route 192.168.0.0 255.255.255.0 10.0.0.1" command. In order to backup,i have another route to the same destination learn by routing protocol(eigrp) with a distance 170. I find that if the interface to the remote side is down,the static route in my the routing table is disappear and the route learned by routing protocol will adopted.But because of the problem of the frame-relay service provider, if the remote side 's interface is down, the pvc on the near side remains active .So when i issued the command "show interface "or "sh frame-relay pvc" in my router ,the interface remains up/up,and the pvc remains active,but actually the next hop address is unreachable.

In this case ,the static route still remains in the routing table ,and the dynamic route will not adopt by the route,so backup is not achieved.

The problem is : how can i find a way to set the static route so that when the next hop address is unreachable (although the interface remains up/up),the static route will disappear so that the dynamic route to the same destination will adopted?

By the way ,i can only use static route between these two sides.

mmolina2 · ‎10-09-2002

Unfortunately, as long as your local point-to-point interface remains up/up, the static route configured will remain valid. The only solution I see to your problem is Frame Relay End-To-End Keepalive. Providing you have the IOS and the platforms to support this feature, you will no longer have to rely on the provider to report the correct PVC status and your static route will be removed after the interface is declared down. Good luck,

huangzhy · ‎10-10-2002

But it's said the end to end keepalive only have effect on physical interface.If a point-to-point subinterface is down,the whole physical interface is down.Is it right?

jamey · ‎10-10-2002

I wonder if you could use a dynamic routing protocol (EIGRP) when the network is working fine to get your routing info instead of static routes. Then use a floating static route for the backup.

That way, if the frame goes down (even though the interface is up/up, EIGRP keepalives will not be able to be exchanged over the frame-relay link, because the neighbor is inaccessible) and the route table will drop the EIGRP routes and then use the floating static route (e.g. the backup route)

huangzhy · ‎10-10-2002

But unfortunately ,i can only use static route between these two site.So Is there any solutions?

loma · ‎10-11-2002

I was thinking of two solutions:

- Frame Relay End-to-End Keepalive

http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1830/products_feature_guide09186a0080087a58.html#xtocid0

- PPP over frame-relay.

http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1830/products_feature_guide09186a008008744a.html

huangzhy · ‎10-12-2002

The questions is : one end of the router is cisco router ,but the other end of the router is not a cisco router.

I can only use Frame-relay end-to-end keepalive and PPP over Frame-relay if both ends are cisco routers,right?