Mpls-Tp Model; Figure 7: Mpls-Tp Model - Alcatel-Lucent 7450 Manual

Ethernet service switch

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MPLS-TP Model

The system can play the role of an LER and an LSR for static MPLS-TP LSPs, and a PE/T-PE and

an S-PE for static MPLS-TP PWs. It can also act as a S-PE for MPLS-TP segments between an

MPLS network that strictly follows the transport profile, and an MPLS network that supports both

MPLS-TP and dynamic IP/MPLS.

MPLS-TP Model

working and protect LSPs of an LSP tunnel. These are modelled as working and protect paths of

an MPLS-TP LSP in SROS. MPLS-TP OAM runs in-band on each path. 1:1 linear protection

coordinates the working and protect paths, using a protection switching coordination protocol

(PSC) that runs in-band on each path over a Generic Associated Channel (G-ACh) on each path.

Each path can use either an IP numbered, IP unnumbered, or MPLS-TP unnumbered (i.e. non-IP)

Server Layer

Note that in SR OS, all MPLS-TP LSPs are bidirectional co-routed, as detailed in RFC5654. That

is, the forward and backward directions follow the same route (in terms of links and nodes) across

the network. Both directions are setup, monitored and protected as a single entity. Therefore, both

MPLS-TP Identifiers (RFC 6370)

Proactive CC, CV, and RDI using BFD for LSPs (RFC 6428)

On-Demand CV for LSPs and PWs using LSP Ping and LSP Trace (RFC 6426)

1-for-1 Linear protection for LSPs (RFC 6378)

Static PW Status Signaling (RFC 6478)

shows a high level functional model for MPLS-TP in SROS. LSP A and LSP B are the

Services see SDP as per IP/MPLS case

Each direction of TP LSP presented as

undirectional SDP to service

Abstracts underlying LSPs towards SDP;

PSC (linear protection) picks working LSP

MPLS manages independent bidirectional

MPLS-TP LSP paths

Numbered and unnumbered interface

7450 ESS MPLS Guide