Basic MPLS VPN

[bluesox123]

Dear All

i am trying to do a basic mpls vpn

all routers are running ospf 1 in the backbone

and ospf 1 And 2  on the CE routers

everything is fine till i try to put redistribution on PE routers has below and i get the messages below any help i would by gratful for yours Jimmy

[cadet alain]

Hi,

Can you post sh ip vrf and sh ip vrf int commands output.

Regards.

Alain.

[bluesox123]

Dear Sir

the output is below for the two PE routers still wont let me configure ospf 1 VRF Table for CustA

yours

Jimmy

[tamassini]

Hi Blusox123,

Ensure to use a separate OSPF process for each VRF and for the global routing table.

BR,

Aliou

[cadet alain]

like tamassini suggested you should have a different pid for the global routing table and each vrf.

Regards.

Alain.

[bluesox123]

Dear Cadet and Tamassina

Thank you for your help i changed the vrf process  numbers to ospf 3 and 4 and it worked i bought

and it was fine for doing rip and  eigrp but i could not work out  what was wrong in OSPF

i just read the instructions and asked why the lab would not work in GNS3

I Am still waiting for a reply from configure terminal

if you had not spoted it i  would be still on the lab

probably a silly question why do you need different ospf processes for the vrf  and routeing table

yours

Jimmy

[tamassini · Accepted solution]

Hi,

Let me quoute the text from "MPLS and VPN Architectures by Guichard and Pepelnjak" page 178.

... a mechanism is needed so that the PE-router can distinguish which routes belong to which VRF. This is accomplished through association of a particular customer interface to a specific VRF (per the standard MPLS/VPN model that we have already described) and to a particular OSPF process.
A separate OSPF process is necessary for each VRF that will receive VPN routes via OSPF. This is different than the procedures used when either RIP Version 2 or BGP are deployed across the PE-to-CE link because these protocols can run different routing contexts within the same process. Due to the complexity of OSPF and the associated topology database, this option is not currently available, so a different OSPF process (with a different process-ID) is required per VRF.

HTH.

PS: Please don't forget to mark your question answered

BR,

Aliou

[bluesox123]

Dear Tamassina

again thank you for clearing things up for me 

yours

Jimmy