Friday, August 28, 2009

MPLS IP In MPLS TE Tunnel




I have posted various post of MPLS TE and everytime I receive the question why and when mpls ip is used in TE tunnel. In this post I would like to conclude when, where and why mpls ip is used in TE tunnel.

Scenarios Where MPLS IP Is Used Or Not

1. If the MP-iBGP and Tunnel destinations are different, mpls ip command is required.
2. If the MPLS TE terminates at the egress PE, no ldp/tdp is required.
3. If the MPLS TE terminates before the PE router or egress router, tag switching is required (three labels are used).

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3 comments:

Anonymous said...

Quick question - when you said on your post "If the MP-iBGP and Tunnel destinations are different, mpls ip command is required" did you mean in case the peering source of the MP-iBGP connection and TE destination are different. Example, if three routers R1,R2 and R3 are peering MP-iBGP full mesh on their lo0 and there is MPLS TE between R1 to R3 tunnel destination on Lo1 going through R2 bidirectional. would i need to configure Mpls ip on the tunnel interface and lo1?

Thanks in advance

shivlu jain said...

You are abso right. If the MP-iBGP and TE destinations are different, you require mpls ip command.

Anonymous said...

Thanks, Keep up the good work.