Technical Summary
MPLS LSPs (emulating traditional transport circuits) are expected
to deliver the same the capabilities for monitoring cnnections as in
earlier types of transport networks.
This document describes and specifies, as required in RFC 5860,
Continuity Check (CC), proactive Connection Verfication (CV),
and Remoted Defect Indication (RDI). This document describes
the use of the Bidirectional Forwarding Detection protocol (BFD)
for for these functions for pseudowires (PWs), Label Switched
Paths (LSPs), and Sub-Path Maintenance Entities (SPMEs)
between two Maintenance Entity Group End Points (MEPs).
CC and Proactive CV are functions used to detect loss of
continuity (LOC), and unintended connectivity between two
MEPs.
RDI is an indicator that is transmitted by a MEP to communicate
to its peer MEP that a signal fail condition exists.
This document specifies the BFD extension and behavior to satisfy the
CC, the proactive CV monitoring, and the RDI functional requirements
for both co-routed and associated bi-directional LSPs. The document
describes a number of encapsulations. Procedures for uni-directional
LSPs are for further study.
The mechanisms specified in this document are restricted to BFD
asynchronous mode.
Working Group Summary
This document is a MPLS working group document, and part of the joint
IETF / ITU-T MPLS-TP project. It has been reviewed in both organizations
and there is a solid support for the document.
The document was discussed and last-called in the MPLS and BFD WGs.
Document Quality
The document is well reviewed in the MPLS working group,the ITU-T and
the BFD working group. A number of vendors have committed to implement
and there is believed to be at least one early implementation.
Personnel
Loa Andersson (loa@pi.nu) is the Document Shepherd.
Adrian Farrel (adrian@olddog.co.uk) is the Responsible AD
RFC Editor Note
Please try to set the figures so that they don't break over a page.