Mpls-Tp On Pseudowires; Mpls-Tp Maintenance Identifiers - Alcatel-Lucent 7450 Manual

MPLS-TP Maintenance Identifiers

The 7750 may play the role of either an LER or an LSR.

MPLS-TP on Pseudowires

MPLS-TP is supported on PWs with static labels. The provisioning model supports RFC6370-
style PW path identifiers for MPLS-TP PWs.
MPLS-TP PWs reuse the static PW provisioning model of previous SR OS releases. Including the
use of the PW-switching key work to distinguish an S-PE. Therefore, the primary distinguishing
feature for an MPLS-TP PW is the ability to configure MPLS-TP PW path identifiers, and to
support MPLS-TP OAM and static PW status signaling.
The system can perform the role of a T-PE or an S-PE for a PW with MPLS-TP.
A spoke-SDP with static PW labels and MPLS-TP identifiers and OAM capabilities can use an
SDP that uses either an MPLS-TP tunnel, or that uses regular RSVP-TE LSPs. The control word is
supported for all MPLS-TP PWs.
MPLS-TP Maintenance Identifiers
MPLS-TP is designed for use both with, and without, a control plane. MPLS-TP therefore
specifies a set of identifiers that can be used for objects in either environment. This includes a path
and maintenance identifier architecture comprising Node, Interface, PW and LSP identifiers,
Maintenance Entity Groups (MEGs), Maintenance End Points (MEPs) and Maintenance
Intermediate Points (MIPs). These identifiers are specified in RFC6370.
MPLS-TP OAM and protection switching operates within a framework that is designed to be
similar to existing transport network maintenance architectures. MPLS-TP introduces concept of
maintenance domains to be managed and monitored. In these, Maintenance Entity Group End
Points (MEPs) are edges of a maintenance domain. OAM of a maintenance level must not leak
beyond corresponding MEP and so MEPs typically reside at the end points of LSPs and PWs.
Maintenance Intermediate Points (MIPS) define intermediate nodes to be monitored. Maintenance
Entity Groups (MEGs) comprise all the MEPs and MIPs on an LSP or PW.
Page 64 7450 ESS MPLS Guide