Subject: Aggregate Label and Interface Labels

From: "Rohit Gupta" <[email-masked]>
Date: Wed, 22 Oct 2003 18:11:57 +0530

Hi,

I have a doubt and would really appreciate if someone could clarify that.

AFAIK a unique label is generally associated whenever an interface is bound to a VRF. Say, we call this a "CE Label". Thus if i have two interfaces bound to a VRF (same or different) then i will have 2 labels for all the routes that i originate via these 2 interfaces. The other option is to configure an Aggregate Label. This will be associated with a VRF. Thus if an MPLS packet comes with the Aggregate label then the PE router will do an IPv4 lookup to determine the outgoing interface for the data packet.

Now suppose i bind some interfaces to this VRF (for which i already have an aggregate label). Is it possible for an admin to specify that he wants to use a "CE Label" for all the routes learnt over this interface and the Aggregate Label for all others learnt form other interfaces (tied to the same VRF)?

And if its possible then is there any reason why somebody would want to do that? Policy Reasons?

Any clues anybody.

Regards,
Rohit

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