SOunds like a recursive route. WHen the tunnel is up but the DS3 is
down, the best route from router A to router B is via the tunnel - so
the tunnel tries to send the tunnelled packets over the tunnel, which
doesn't work, so the OSPF adjacency goes down. When its down, the real
best route is discovered, but then the OSPF adjacency comes up again.
You need to static route tunnel destination on both routers so it does
not try to send them through the tunnel, but instead sends them off to
the Internet.
Joe McGuckin wrote:
>I'm trying to setup a backup connection using a GRE tunnel over a seperate
>ethernet network.
>
>For the tunnel I have:
>
>Router A:
>
>interface Tunnel0
> ip address 209.81.1.33 255.255.255.252
> no ip directed-broadcast
> ip mtu 1500
> tunnel source W.X.Y.Z
> tunnel destination A.B.C.D
>
>Router B:
>
>interface Tunnel0
> ip address 209.81.1.34 255.255.255.252
> no ip directed-broadcast
> ip mtu 1500
> tunnel source A.B.C.D
> tunnel destination W.X.Y.Z
>
>
>The tunnel comes up and OSPF on the 2 routers exchanges routes.
>
>Then, to test it, I unplug the primary net connection (a DS3).
>
>After about 10 seconds, the tunnel dies. Then after another 5 seconds,
>the tunnel is re-established.
>
>The tunnel (and OSPF between the two routers) just bounces up and down
>forever.
>
>What am I doing wrong ?
>
>Thanks,
>
>Joe
>
>
>--
>
>Joe McGuckin
>
>ViaNet Communications
>994 San Antonio Road
>Palo Alto, CA 94303
>
>Phone: 650-213-1302
>Cell: 650-207-0372
>Fax: 650-969-2124
>
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:13:33 EDT