Juniper ACX2000 Configuration Guide

When configuring the support of PCE-initiated LSPs for a PCC, be aware of the following
considerations:
•
Junos OS Release 13.3 supports only stateful PCEs.
•
For Junos OS Release 13.3, the PCC always initiates the PCEP sessions. PCEP sessions
initiated by remote PCEs are not accepted by the PCC.
•
Existing LSP features, such as LSP protection and make-before-break, work for
PCE-initiated LSPs.
•
PCE-initiated LSPs do not support graceful Routing Engine switchover (GRES).
•
PCE-initiated LSPs under logical systems are not supported.
•
PCE-initiated LSPs cannot be point-to-multipoint LSPs.
•
Bidirectional LSPs are not supported.
•
RSVP-TE for unnumbered links is not supported. PCE-initiated LSPs support only
numbered links.
Topology
Figure 41: Example PCE-Initated LSP for MPLS RSVP-TE
g043463
PCE2
PCE1
10.0.102.10
ge-3/ 1/1
lo0=192.168.12.1 lo0=192.168.10.1 lo0=192.168.11.1
lo0=192.168.69.58
lo0=192.168.70.65
R1
ge-0 / 1/2
10.0.101.10
10.0.101.9
ge-3/ 1/2
R2
ge-0/1/1
10.0.102.9
ge-0/1/3
10.0.112.14
ge-0/1/3
10.0.112.13
PCC
In this example, PCC is the ingress router that connects to two external stateful PCEs:
PCE1 and PCE2.
When there is a new demand, the active stateful PCE dynamically initiates an LSP to
meet the requirement. Since PCC is configured with the capability of supporting the
PCE-initiated LSP, path computation on PCC is performed as follows:
1. A PCE sends a PCCreate message to the PCC to initiate and provision an LSP. The
PCC sets up the PCE-initiated LSP using the parameters received from the PCE, and
automatically delegates the PCE-initiated LSP to the PCE that initiated it.
In this example, PCE1 is the active stateful PCE that initiates and provisions the
PCE-initiated LSP on PCC. On receiving the PCE-initiated LSP parameters, PCC sets
up the LSP and automatically delegates the PCE-initiated LSP to PCE1.
2. When the PCEP session between PCC and PCE1 is terminated, PCC starts two timers
for the PCE1-initiated LSP: delgation cleanup timeout and the LSP cleanup timer.
During this time, PCE1 or PCE2 can acquire control of the PCE-initiated LSP.
723Copyright © 2017, Juniper Networks, Inc.
Chapter 23: Configuring Path Computation Element Protocol (PCEP)

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English