On an MPLS/VPN PE router, I have configured OSPF as the PE/CE routing protocol.
I configured several OSPF processes (one for each VRF).
But if I have several customers who are using the same OSPF area ID on the CE side, may I configure the same area ID for several OSPF processes on the PE side ? Of course, all of those areas are independent and I don't want to see customer1's routes into the OSPF of customer2 !
In the following example, I have 2 customers. Each customer has got 2 sites and has an OSPF backbone area which is spread accross his 2 sites. For each customer, I want to interconnect his 2 sites and extend OSPF backbone area across MPLS.
The OSPF backbone area of customer1 is different from the one of customer2, even if the ID is the same...
Here is a sample of the PE's configuration :
ip vrf forwarding customer1
ip address 10.1.1.1 255.255.255.0
ip vrf forwarding customer2
ip address 10.1.2.1 255.255.255.0
router ospf 1 vrf customer1
network 10.1.1.0 0.0.0.255 area 0
router ospf 2 vrf customer2
network 10.1.2.0 0.0.0.255 area 0
Won't I experience problems if I use the same area ID there ?
"[...] In addition to that also configure domain-id (a /32 unique ip address) under ospf process for each customer. The reason if you configure ospf process id 1 for cust1 at A-End and if you configure process id 2 for same customer on B-end the routes propogated from A-end will be seen as inter-area at B-end [...]"
I guess you mean :
If OSPF domain-id is not the same on PE at both ends, the routes will be exported within type-5 external LSA at B-end
If OSPF domain-id matches on PE at both ends, the routes will be exported within type-3 inter-area LSA at B-end.
Yes you are right you can use; for every customer you can use the same area; this is the main advantage of using MPLS. For domain id you can check the post which tells about to use the domain-id for receiving routes from same customer. By default domain-id is changed for every vrf per PE and you receive one CPE routes to another CPE routes of same vpn as external routes. Please check my post for domain-id:-
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