MPLS BGP problem

From: Ryder, Keith <Keith.Ryder_at_globalcrossing.com>
Date: Fri, 27 Nov 2009 11:14:07 -0000

I have a working MPLS network but when a new VRF is added one router
refuses to install the default received from an Ebgp peer.

Below is the simple part if the VRF config

ip vrf test

 rd 60000:1009

 route-target export 60000:1009

 route-target import 60000:1009

router bgp 60000

neighbor etc etc

address-family ipv4 vrf test

 neighbor 10.238.165.125 remote-as 60000

 neighbor 10.238.165.125 version 4

 neighbor 10.238.165.125 activate

 neighbor 10.238.165.125 send-community

 no auto-summary

 no synchronization

 exit-address-family

routes in the vrf look fine

Show ip route vrf test

     1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [200/0] via 192.168.151.117, 00:30:02

     10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks

B 10.238.165.96/27 [20/0] via 10.238.165.125, 22:39:07

C 10.238.128.0/18 is directly connected, FastEthernet2/5.938

B 10.238.163.128/26 [20/2] via 10.238.165.125, 22:43:23

But no default route installed.

CEF shows

Prefix Next Hop Interface

0.0.0.0/0 drop Null0 (default route handler
entry)

0.0.0.0/32 receive

1.1.1.1/32 192.168.151.7 SRP1/1

10.238.128.0/18 attached FastEthernet2/5.938

10.238.128.0/32 receive

10.238.163.128/26 10.238.165.125 FastEthernet2/5.938

10.238.165.96/27 10.238.165.125 FastEthernet2/5.938

10.238.165.125/32 10.238.165.125 FastEthernet2/5.938

Same config on another router (all connected via an srp ring)

     1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [200/0] via 192.168.151.117, 00:32:29

     10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks

B 10.238.165.96/27 [20/0] via 10.238.165.121, 5w1d

C 10.238.165.120/30 is directly connected, FastEthernet2/5.937

B 10.238.163.128/26 [20/2] via 10.238.165.121, 5w1d

B* 0.0.0.0/0 [200/1] via 192.168.151.117, 21:10:25

Default route installed.

CEF shows

Prefix Next Hop Interface

0.0.0.0/0 192.168.151.7 SRP1/1

0.0.0.0/32 receive

1.1.1.1/32 192.168.151.7 SRP1/1

10.238.163.128/26 10.238.165.121 FastEthernet2/5.937

10.238.165.96/27 10.238.165.121 FastEthernet2/5.937

10.238.165.120/30 attached FastEthernet2/5.937

10.238.165.120/32 receive

10.238.165.121/32 10.238.165.121 FastEthernet2/5.937

10.238.165.122/32 receive

10.238.165.123/32 receive

224.0.0.0/24 receive

255.255.255.255/32 receive

I can force a route to be advertised as I have done with 1.1.1.1 using a
null route.

Is the default route not being installed due to the cef drop or
something else?

Driving me nuts everything works but not a default route.

FE-----Router 1----SRP 1/1------Router2------FE------Router3(origin of
1.1.1.1-------R4(origin of 0.0.0.0)

       Default OK No default
<<<<0.0.0.0

       1.1.1.1 ok 1.1.1.1 ok

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Received on Fri Nov 27 2009 - 11:14:07 ART

This archive was generated by hypermail 2.2.0 : Tue Dec 01 2009 - 06:36:29 ART