Default route not good enough for EBGP session

From: mcaplan.cs@xxxxxxxxxxxxxxx
Date: Fri May 04 2001 - 12:55:48 GMT-3


   
HI,

I have a very simple set up

(lo 0)R1----frame PVC-----R2(lo 0)

Configs ar shown below. I am setting up EBGP between R1 and R2, using Lo 0
as the peer IP address in both cases. I can do an extended ping from R1 to
R2 usng Lo 0 as the source address. The neighbor relationship however will
not progress beyond active.
The following is the output from debug ip bgp

03:59:52: BGP: 11.11.11.11 multihop open delayed 19344ms (no route)

There is a route, but it just happens to be the default route. It all works
fine if I put a more precise route onto R1 or R2. Why does it fail with
default routes, when extended ping works fine ?

R1

interface Loopback0
 ip address 10.10.10.10 255.255.255.255
 no ip directed-broadcast
!
interface Serial0
 ip address 12.1.1.1 255.0.0.0
 no ip directed-broadcast
 encapsulation frame-relay
!
router bgp 1
 neighbor 11.11.11.11 remote-as 2
 neighbor 11.11.11.11 ebgp-multihop 255
 neighbor 11.11.11.11 update-source Loopback0
!
ip classless
ip route 0.0.0.0 0.0.0.0 12.2.2.2

Gateway of last resort is 12.2.2.2 to network 0.0.0.0

     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.10.10/32 is directly connected, Loopback0
C 10.1.0.0/16 is directly connected, TokenRing0
C 12.0.0.0/8 is directly connected, Serial0
S* 0.0.0.0/0 [1/0] via 12.2.2.2

R2

interface Loopback0
 ip address 11.11.11.11 255.255.255.255
 no ip directed-broadcast
!
interface Serial0
 ip address 12.2.2.2 255.0.0.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 logging event subif-link-status
 logging event dlci-status-change
 no fair-queue
 clockrate 2000000
!
router bgp 2
 neighbor 10.10.10.10 remote-as 1
 neighbor 10.10.10.10 ebgp-multihop 255
 neighbor 10.10.10.10 update-source Loopback0
!
ip classless
ip route 0.0.0.0 0.0.0.0 12.1.1.1

Gateway of last resort is 12.1.1.1 to network 0.0.0.0

     11.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 11.11.11.11/32 is directly connected, Loopback0
C 11.1.0.0/16 is directly connected, Ethernet0
C 12.0.0.0/8 is directly connected, Serial0
S* 0.0.0.0/0 [1/0] via 12.1.1.1

Any advice with this strange behaviour ?

Cheers

Mark

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