[MPLS] LDP GR query

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空白Hi  M. Leelanivas , Y. Rekhter and R. Aggarwal,



 I have a question about RFC 3478 .Please see the below graph.



RTA----LANSWITCH-×---LANSWITCH----RTB

 

If the link between the two LAN-SWITCH is down ,RTA and RTB will think the other side LSR restarting,so these two LSR will think themselves as helper router. They will perform GR flow together.

In this scenario ,we can use other mechanism ( such as BFD) to avoid performing GR process . But if we don’t have other mechanism, then these two LSR will perform GR process.

 Another case ,

the LDP session will be down is when the LSR’s neighbor can’t send out it’s packet, including hello packet or keepalive packet, if the control plane of it’s neighbor is very busy or occurs some error ,then the LDP session will be down. In this case the LSR will conclude that it’s neighbor restart and the LSR will implement GR flow.

I  want to know whether the LSR clearly signal it’s neighbor that it is restarting through FT session TLV in RFC 3478 .

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