BGP routing, not able to ping

Unanswered Question
Feb 8th, 2007

Hi,

We have the following two routing tables, but are not able to ping end-to-end. i.e 172.17.39.1

R1:

172.17.0.0/24 is subnetted, 1 subnets

B 172.17.39.0 [20/0] via 172.25.33.9, 00:22:36

172.25.0.0/16 is variably subnetted, 3 subnets, 2 masks

S 172.25.25.46/32 [1/0] via 172.25.33.3

C 172.25.33.0/24 is directly connected, FastEthernet0/0

S 172.25.100.0/24 [200/0] via 172.25.33.3

S* 0.0.0.0/0 [1/0] via 87.238.64.16

ru9616a#

R2:

ru214#sh ip route vrf internet2

172.17.0.0/24 is subnetted, 1 subnets

C 172.17.39.0 is directly connected, FastEthernet0/0.150

172.25.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.25.32.222/32 is directly connected, Loopback1

B 172.25.33.0/24 [200/0] via 172.29.252.9, 00:08:19

B* 0.0.0.0/0 [200/0] via 172.29.252.9, 00:08:19

ru214#

I have this problem too.
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sachinraja Thu, 02/08/2007 - 00:58

hello mate,

can you explain your scenario a little more ?? what networks do you have ?? what is the WAN etc ??

Raj

bjornarsb Thu, 02/08/2007 - 01:32

We have one router connected to Internet,

this router serves the default route to Internet. Second we have a vrf called internet2 that is connected all the way to the CPE using M-BGP. The Internet router is a EBGP neighbour with the M-BGP router.

The lan on the cpe: 172.17.39.0/24 i supposed to reach Internet

using the default route received from M-BGP.

That is: 172.29.252.9.

The wan is SHDSL.

mheusinger Thu, 02/08/2007 - 02:03

How are you implementing VRF to global routing table connectivity (both directions!)?

Per default IP addresses in a VRF MUST NOT have connectivity to ip addresses in the global routing table. So you might just experience the default behaviour.

Can you post the relevant config excerpts (remove security relevant infos!)?

There are several options to implement VRF to internet connectivity. So depending on your choice we can surely help you to solve the problem.

Regards, Martin

bjornarsb Thu, 02/08/2007 - 02:25

There is no global routing.

The default route is inside the vrf.

Its a separate vlan. We have to M-BGP routers between R1 and R2.

!

interface GigabitEthernet0/3.32

encapsulation dot1Q 32

ip vrf forwarding internet2

ip address 172.25.33.9 255.255.255.0

end

The problem seems to be that

the M-BGP router does not build a LSP table entry for the CPE lan 172.17.39.0/24

RU969#sh mpls forwarding-table vrf internet2

Local Outgoing Prefix Bytes tag Outgoing Next Hop

tag tag or VC or Tunnel Id switched interface

1211 Aggregate 172.25.33.0/24[V] 0

2989 Untagged 0.0.0.0/0[V] 0 Gi0/3.32 172.25.33.15

RU969#

o_dogorshom Sun, 02/11/2007 - 23:03

Hi,

I'm not yet clear with your setup but for the default route inside the vrf table if your are pointing to an address that is outside the vrf (in the global routing table) you should configure the parameter (global) in the static route statement.

and if you have attached a small diagram it will be easier to figure out the cause of the problem.

regards

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