From: Chris McGuire (cmcguire@firstdigital.com)
Date: Wed Apr 09 2008 - 22:49:19 ART
Can you show the whole configuration for OSPF on R2 and R5? As well possibly
a show ip route (without the static route) when it is not working as it
should?
Thanks
Chris
On 4/9/08 5:38 PM, "Matt Bentley" <mattdbentley@gmail.com> wrote:
> Hi GS:
>
> I know this sounds pretty weird, but here's is what's going on.
>
>
> R1<--------------R2--------------------->R5
> (area 0) Fa0/0 (e0/0)
> <------------------------>
> NSSA Area
> GRE Tunnel
>
> I have an OSPF adjacency over both the GRE tunnel as well as over the
> physical interfaces on R2 and R5.
>
> Here is relevant config:
>
> R2:
> int tun0
> tunnel source fa0/0
> tunnel destination 141.1.0.5
> ip add 1.1.1.2 255.255.255.0
>
> router ospf 1
> network 141.1.0.2 0.0.0.0 area 2
> network 1.1.1.2 0.0.0.0 area 0
>
>
> R5:
> int tun0
> tunnel source e0/0
> tunnel destination 141.1.0.2
> ip add 1.1.1.5 255.255.255.0
>
> router ospf 1
> network 141.1.0.2 0.0.0.0 area 2
> network 1.1.1.5 0.0.0.0 area 0
>
> For some reason I don't know, the tunnel adjacency won't come up unless I
> have the tunnel sources be the directly connected interfaces. I CAN reach
> R2 from R5, but CAN'T reach R1 from R5, even though R5 has a route which
> appears to trace (based on the "show ip route" output) directly as it should
> go to get to R1. R1 can get to R5 (I know this because of debugging ICMP
> -which R5 receives, and subsequently sends a packet to R1, but it never gets
> there. As soon as I configure a static route on R5 - and it doesn't matter
> whether it is to the tunnel interface or to e0/0, then I can ping that
> prefix. The traffic must be getting blackholed someplace, but I really
> can't figure out where. Thanks in advance for everybody's help.
>
>
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