Subject: [mpls] Answer to: "For inter area/as so we need PCE support?"

From: Huaimo Chen <[email-masked]>
Date: Mon, 26 Sep 2011 20:46:43 +0000

Hi Yimin,

    The following is the answer with some more details to your question ""For inter area/as so we need PCE support?" in IETF 81.
    Yes, we need PCE support for inter area/AS case. When P2MP LSP is in one area or AS, and CEs connecting to the ingress and egress routers are in different areas or ASes, with support from PCE, backup ingress router and backup egress routers can be computed automatically.  In addition, the backup path from the backup ingress to the next hops of the ingress router and the backup path from the penultimate hop of an egress router to the corresponding backup egress router can also be computed automatically.

Best Regards,

Huaimo