OSPF VRF

Answered Question
Apr 5th, 2007

Theoretically Speaking, Can I build my entire OSPF domain using OSPF VRF process instead of regular OSPF process?

Thanks.

I have this problem too.
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Correct Answer by Harold Ritter about 9 years 8 months ago

MPLS makes the transport of VPN traffic a lot more scalable as the multiplexing/demultiplexing of different VPNs is achieved via the VPN label.

Without MPLS, you would need to configure a separate sub-interface on each core link for each VPN, which would make it hard to scale and a nightmare to provision unless the network was very small. This also entails that your core interfaces would be required to support some sort of multiplexing/demultiplexing functionality (ATM, FR, DOT1q, etc).

Hope this helps,

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owaisberg Thu, 04/05/2007 - 14:41

Yes you can, you will have to define VRFs

on all involved routers and place participating interfaces into this VRF.

HTH,

OW

kevin.hu Fri, 04/06/2007 - 08:26

That's without running MPLS right? Why does ISP needs MPLS to transport VRF routes? It is possible to propagate routes via VRF routing process in the provider core without MPLS, right?

Correct Answer
Harold Ritter Fri, 04/06/2007 - 10:45

MPLS makes the transport of VPN traffic a lot more scalable as the multiplexing/demultiplexing of different VPNs is achieved via the VPN label.

Without MPLS, you would need to configure a separate sub-interface on each core link for each VPN, which would make it hard to scale and a nightmare to provision unless the network was very small. This also entails that your core interfaces would be required to support some sort of multiplexing/demultiplexing functionality (ATM, FR, DOT1q, etc).

Hope this helps,

owaisberg Fri, 04/06/2007 - 11:18

The setup I mentioned doesn't require MPLS,

and yes you still can transport VRF routes

across the provider backbone however for that

to happen all provider's routers should be

VRF aware of that specific VRF you use for

a customer, which is extremely difficult to

accomplish when we're talking about hundreds

of customers.

HTH,

OW

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