Technical Summary
In the context of MPLS TE Fast Reroute, the Merge Point (MP) address is
required at the Point of Local Repair (PLR) in order to select a backup
tunnel intersecting a fast reroutable Traffic Engineering Label
Switched Path (TE LSP) on a downstream Label Switching Router (LSR).
However, existing protocol mechanisms are not sufficient to find an MP
address in multi-domain routing networks where a domain is defined as
an IGP area or an Autonomous System. Hence, the current MPLS Fast
Reroute mechanism cannot be used in order to protect inter-domain TE
LSPs from a failure of an ABR (Area Border Router) or ASBR (Autonomous
System Border Router) respectively. This document specifies the use of
existing Route Record Object (RRO) IPv4 and IPv6 sub-objects (with a
new flag defined) thus defining the node-id subobject in order to solve
this issue. The MPLS Fast reroute mechanism mentioned in this document
refers to the "Facility backup" MPLS TE Fast Reroute method.
Working Group Summary
There was consensus within the WG to progress this document.
Protocol Quality
Alex Zinin reviewed this document for the IESG. There is at least one
implementation of this specification.