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[mpls] What happens to the FECs advertised by LDP when the routeris no longer egress for that FEC

  • From: "Dutta, Pranjal" <pdutta@riverstonenet.com>
  • Date: Thu, 2 Jun 2005 09:37:32 +0530
  • Thread-Index: AcVnKJmco9sKjnOtTBeQogQJCJjjXg==
  • Thread-Topic: What happens to the FECs advertised by LDP when the router is nolonger egress for that FEC

Hi All,

                    I am a bit not clear on one point from MPLS Architecture RFC. In downstream unsolicited and ordered control mode, the egress router takes the initiative for label binding for the FECs for which it is egress. No let’s consider the following simple topology.

 

 

        Native IP ------àR1----mpls-----àR2-------mpls------àR3--------------Native IP---àR4-----------------Native IP-------à10.171.2..0/24

 

 

Here there is an LSP established by LDP from R1 to R3 for FEC 10.171.2.0/24 and R3 is the egress point for the LSP since the FEC is routed over a native IP interface from R3 (R3->R4->). Now let’s say that we have enabled MPLS in R4 and also in R3---R4 interface. At this point R4 becomes the egress point for FEC 10.171.2.0/24. Now the question is at this moment whether R3 will withdraw the local binding for the FEC and trigger the same in upstream direction through LDP and will wait for a remote binding from R4 to meet the requirement of ordered control. Or R3 will still be the egress point till it receives a remote binding from R4 for the FEC.

 

Thanking in advance,

Pranjal

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