Inter-as with back to back vrf

Been fighting this for a bit. It appears that the forwarding table from AS1 are not coming over. The BGP VPNV4 routes look fine. Everything is the same as the answer guide i am at a loss here. Almost seems like some kind of loop.
R4 has all of the proper labels
Rack1R4#sh mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
16 Pop tag 150.1.5.5/32 0 Se0/0.1 point2point
17 Pop tag 150.1.56.0/24 0 Se0/0.1 point2point
18 Untagged 222.22.2.0/24[V] 0 Et0/0.200 150.1.200.2
19 Untagged 220.20.3.0/24[V] 0 Et0/0.200 150.1.200.2
20 Untagged 205.90.31.0/24[V] 0 Et0/0.200 150.1.200.2
21 Untagged 192.10.1.0/24[V] 0 Et0/0.200 150.1.200.2
22 Untagged 10.1.7.0/24[V] 0 Et0/0.100 150.1.100.2
23 Untagged 10.1.37.0/24[V] 0 Et0/0.100 150.1.100.2
24 17 150.1.6.6/32 0 Se0/0.1 point2point

However on R2 the lables are not being tagged to the routes


Rack1R2#sh mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
16 Pop Label 150.1.1.1/32 0 Se1/0.1 point2point
17 17 150.1.3.3/32 0 Se1/0.1 point2point
18 Pop Label 150.1.13.0/24 0 Se1/0.1 point2point
19 No Label Paths Unkn

20 No Label Paths Unkn

21 No Label Paths Unkn

22 No Label Paths Unkn

23 No Label Paths Unkn

24 No Label Paths Unkn

25 No Label Paths Unkn

26 No Label Paths Unkn

27 No Label Paths Unkn

Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
28 No Label Paths Unkn


However they appear to be ok here;

Rack1R2#sh ip bgp vpnv4 all labels
Network Next Hop In label/Out label
Route Distinguisher: 1:100 (SW1-BB1)
10.1.7.0/24 150.1.3.3 nolabel/20
10.1.37.0/24 150.1.3.3 nolabel/21
54.1.1.0/24 150.1.100.4 19/nolabel
54.1.2.0/24 150.1.100.4 20/nolabel
54.1.3.0/24 150.1.100.4 21/nolabel
54.1.10.0/24 150.1.100.4 22/nolabel
212.18.0.0 150.1.100.4 23/nolabel
212.18.1.0 150.1.100.4 24/nolabel
212.18.2.0 150.1.100.4 25/nolabel
212.18.3.0 150.1.100.4 26/nolabel
Route Distinguisher: 1:200 (SW2-BB2)
10.1.8.0/24 150.1.200.4 27/nolabel
10.1.68.0/24 150.1.200.4 28/nolabel
192.10.1.0 150.1.3.3 nolabel/22
205.90.31.0 150.1.3.3 nolabel/23
220.20.3.0 150.1.3.3 nolabel/24
222.22.2.0 150.1.3.3 nolabel/25

Comments

  • Just got back to this and one thing I have noticed is that the router I am having a issue with the MPLS forwarding table is my 7200 running 12.2.25. The one thing with this IOS is that the "tag switching" command is not supported and you must use the "mpls ip" interface command. could this be the problem as to why the output doesn't look the same as the solution guide. Everything else looks perfect and I have full connectivity to my VRF's.
  • It would appear a shortcoming of code on my 3640. The 7200's have a interface command "mpls bgp forwarding" that forward the lables through EBGP. Since the 3640 does not support this interface command i am assuming thats why I had issues seeing a correct MPLS forwardign table. I moved on but I cam e across this and thought it might be my issue. The weird thing was that I had perfect connectivity to each VPN..
Sign In or Register to comment.