Route Leaking Issue

Question

Hi All,
Still cutting my teeth with MPLS, and i am labbing up some stuff, and i've come accross an issue (or not)
This maybe by design, i'm not sure.
I've got a basic P core running OSPF and MPLS. Easy so far.
I've got 2 PEs, one on each side (still with me )
Attached to each PE I have a CE, and a Loopback.
On each side the CE is in one VRF and the Loopback is in another.
All straighforward so far. Routing is work I am using RIP for the CEs and Redisribute connected for the L-Backs.
MPBGP is working fine and the routes are being carried accross the core.
I now want to step it up and bit a try out some route leaking. I have imported routes from the CE VRF to the LBack VRF easily
on one PE. and vice versa.
However, the next step is where i get confused. When i import routes to a VRF i would expect to see them
propagated accross the MPLS core to the same VRF on the other side of the VPN.
Not sure if it should work like this.
Any Opinions??
Thank all
Stephen

Answer 1

Hi Stephen,
As per your senario you wnat to import the route from one vrf to other vrf  , So to achive that you can configure route-target for same.
Below is the senario :
CE 1_A--------------                                                         ------------------- CE1_B
                           PE 1 ---------------- P ---------------- PE 2
CE 2_A--------------                                                         ------------------- CE 2_B
In above senario
1] CE1_A & CE 1_B are in CUST_A vrf .
2] CE2_A & CE 2_B are in CUST_B vrf .
Now If you want that in CE 1 _A  that is in vrf CUST_A should communicate with only CE2_A that is in vrf CUST_B you ca have different RT , Below is the example for above senario.
PE1 -
ip vrf CUST_A
rd 65000:100
route-target export 65:100
route-target import 65:100
route-target import 65: 20
route-target export 65: 10
ip vrf CUST_B
rd 65000:200
route-target export 65:100
route-target import 65:100
route-target import 65: 10
route-target export 65: 20
Here in above config you can see that in CUST_A vrf we had export the RT 65: 10 & that RT is imported by CUST_B vrf & in CUST_B vrf you had exported  65:20 RT & that RT is imported by CUST_A vrf.
So in now you can see that in CE 1_A & CE 2_A will see each other route in there routing table . This is know as extramet in MPLS.
Regards
Chetan Kumar
http://chetanress.blogspot.com