Subject: [mpls] Answer to: "Is your protection more scalable than PW redundancy?"

From: Huaimo Chen <[email-masked]>
Date: Mon, 26 Sep 2011 20:51:56 +0000

Hi Greg,

    The following is the answer with some more details to your question "Is your protection (P2MP LSP Ingress and Egress Local Protection) more scalable than PW (egress) redundancy" in IETF 81. 

    LSP and PW are at different levels. PW is above LSP. Our ingress and egress protection provides protection for LSP against ingress and egress failures. PW egress redundancy provides protection for PW against egress failure. 

An LSP can be used as a transport for a PW; it can also be used as a transport for other traffic. Thus our ingress and egress protection for LSP can provide protection for the traffic transported over the LSP, which include PW and other traffic against ingress and egress failures.

The PW redundancy against egress failure may provide protection for the PW against egress failure. However, it can not provide protection for the other traffic transported over LSP.

Best Regards,
Huaimo