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).
Friday, August 28, 2009
MPLS IP In MPLS TE Tunnel
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3 comments:
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
You are abso right. If the MP-iBGP and TE destinations are different, you require mpls ip command.
Thanks, Keep up the good work.
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