Juniper ACX2000 Configuration Guide

There are two types of parameters that come from the CLI configuration of an LSP for
a PCE:
•
Parameters that are not overridden by a PCE, and that are applied immediately.
•
Parameters that are overridden by a PCE. These parameters include bandwidth,
path, and priority (setup and hold values). When the control mode switches from
external to local, the CLI-configured values for these parameters are applied at the
next opportunity to re-signal the LSP. The values are not applied immediately.
•
Externally-provisioned LSPs (or PCE-initiated LSPs)—The LSPs that have the
lsp-provisioning statement configured are called PCE-initiated LSPs. A PCE-initiated
LSP is dynamically created by an external PCE; as a result, there is no LSP configuration
present on the PCC. The PCC creates the PCE-initiated LSP using the parameters
provided by the PCE, and automatically delegates the LSP to the PCE.
NOTE: Support for PCE-initiated LSPs is provided in Junos OS Release 13.3
and later releases.
The CLI-controlled LSPs, PCE-controlled LSPs, and PCE-initiated LSPs can coexist on
a PCC.
The CLI-controlled LSPs and PCE-controlled LSPs can coexist on a PCC.
LSP Control Mode
In a client-side PCE implementation, there are two types of control modes for a
PCC-controlled LSP:
•
External—By default, all PCE-controlled LSPs are under external control. When an LSP
is under external control, the PCC uses the PCE-provided parameters to set up the
LSP.
•
Local—A PCE-controlled LSP can come under local control. When the LSP switches
from external control to local control, path computation is done using the CLI-configured
parameters and constraint-based routing. Such a switchover happens only when there
is a trigger to re-signal the LSP. Until then, the PCC uses the PCE-provided parameters
to signal the PCE-controlled LSP, although the LSP remains under local control.
A PCE-controlled LSP switches to local control from its default external control mode
in cases such as no connectivity to a PCE or when a PCE returns delegation of LSPs back
to the PCC.
For more information about CLI-controlled LSPs and PCE-controlled LSPs, see “LSP
Types” on page 701.
Configuration Statements Supported for External Computing
Table 47 on page 703 lists the MPLS and existing LSP configuration statements that apply
to a PCE-controlled LSP.
Copyright © 2017, Juniper Networks, Inc.702
ACX Series Universal Access Router Configuration Guide

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English