Cisco-Juniper MPLS VPNv4 not working

[lma9962@hotmail.com]

Hi

I configured OSPF then MPLS/LDP then I created VRFs in PE routers then BGP and Finally VPN. I'm facing a problem I don't know how to solve(troubleshoot).  BGP peering is okay. Just CEs cant see each other(ping). 

[Harold Ritter]

As in any troubleshooting scenarios, you need to have a structured way to look at this issue.

1. Are routes propagated from the CE to the ingress PE?

2. Are routes installed in local VRF on the ingress PE?

3. Are local VRF routes exported in VPNv4 on ingress PE?

4. Are VPNv4 routes propagated from ingress PE to egress PE?

5. Are routes from VPNv4 imported in the local VRF on the egress PE?

6. Are routes propagated from egress PE to CE via ospf?

7. Repeat the above steps for the routes in the other directions.

You can probably add some details, but you I am sure you get the general idea of the step by step approach.

[Harold Ritter · Accepted solution]

I noted a few things looking at your configuration on R2.

1. You should not redistribute routes from BGP to the main OSPF process

  router ospf 1
   redistribute bgp 100 subnets

2. You should rather redistribute from BGP (vrf MPLS) to "router ospf 2 vrf MPLS"

Regards,

[lma9962@hotmail.com]

I tried that but still no improvement. thanks for responding.

[Harold Ritter]

Hi,

It is very hard to help you if you are not providing more information. Could you please go through the troubleshooting procedure I provided and see if you can fix the issue or provide more information so we can help you fix it.

Regards,

[lma9962@hotmail.com]

The redistribution was the main problem.

I was able to see the BGP peering, and the routing table was populated (#show ip route vrf MPLS), but the CE (cisco) was isolated. I did a lot of troubleshooting and finally, it worked. there was some issue with my subnetting. I never thought the subnet of the loopback would create a problem. I learned the hard way, it does.

Thank you so much,

If anyone has the same problem, I uploaded my configuration with a picture of the topology.

This is most important resources I used. 

Juniper

1- https://www.juniper.net/documentation/en_US/junos/topics/example/mpls-qfx-series-vpn-layer3.html#table-egress-pe-switch

Cisco

1-https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/13734-mpls-vpn-tsh.html

2-https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/13733-mpls-vpn-basic.html

3- really good tutorial form VPNv4.  https://mycexp.joomla.com/routmenu/13-cisco-mpls-vpn

[Harold Ritter]

Thanks for the follow-up and feedback. It is very much appreciated.