The MPLS-OPS Archive

[Dave Stewart <dave_stewart1576@yahoo.co.uk>]

Hello Roger,

 

Are labels unique per router or per interface?

Roger Clark Williams <rogerw@nordlink.com> wrote:

Since labels are locally significant, they can be reused. Router A can use
label 6 as a marker for Destination X, Router B can use Label 6 for
Destination Y (assuming the two routers are not directly connected
neighbors). Secondly, a label for a destination via Router A can be sent
out by Router A to all neighbors, one label for all. Certain platforms
cannot allocate any number of labels but are limited, so saving on the
number of distributed labels makes sense.

Just some reasons I can think of right now.

Roger Williams

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>Subject: [MPLS-OPS]: Local significance of labels?
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>What is the benefit of having locally significant labels versus assigning
>a single label at the edge that stays with the packet as it transverses
>the entire network? Why are labels swapped at each node?
>
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