From: Matt Bentley (mattdbentley@gmail.com)
Date: Wed Apr 09 2008 - 20:38:26 ART
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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