MPLS TE Network Design - Need Advice

Unanswered Question

Please refer to attached diagram.

TE tunnels is configured between Site A and Site B, fully meshed.

But I have Site C, due to geographical near to Site B , the link is connect to site B PE routers, not to P router.

Q: To reach site A shall I just build tunnel between C to A.

Or, I just need C to B will do ??

Assume packet will flow from C to B tunnel, exist then via tunnel B to A to reached network in site A.


I have this problem too.
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mheusing Sun, 03/16/2008 - 11:50


it depends on your traffic. The tunnel endpoint will use an implicit-null label (PHP). Thus site B will perform a lookup on the "A-C" traffic. In other words: there is no end-to-end LSP between A and C, which would be required for example for a MPLS L3VPN.

Regards, Martin


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