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New Member

How to make Multiple VPNs over one E1 between PE and CE?

Hi ALL!

Сommon scheme:

PE--E1--CE(with 2-5 VRFs)--E1--C_router(with 2-5 VRFs)

I know 2 main solutions for subject:

1. GRE tunnels over E1 between PE-CE-C_router

2. Frame relay over E1 between PE-CE-C_router (IMHO MultiVRF-VRF-lite is FR approach)

What most preferred solution from the point of view of Cisco and why ?

Is it possible another solutions?

3 REPLIES

Re: How to make Multiple VPNs over one E1 between PE and CE?

It would be recommended to use subif in place of GRE.

Some reasons i can think offhand would be:

1) Higher overhead of GRE compared to FR (24 vs 6)

2) No possibility of shaping of policing with GRE which could be required in your specific topology.

HTH-Cheers,

Swaroop

New Member

Re: How to make Multiple VPNs over one E1 between PE and CE?

Thanks Swaroop!

I agree with 1) but for 2) I have the following info about possibility of QoS policing

http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a008017405e.shtml

Is it possible other solutions for subj?

--------

Evgeniy

Re: How to make Multiple VPNs over one E1 between PE and CE?

Yes you are right with the info you found.

Looking at the document policing and shaping is indeed supported with GRE.

You can although decide to go with FR and subif based on the overheads.

HTH-Cheers,

Swaroop

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