Juniper ACX1000 Configuration Manual page 767

Copyright © 2017, Juniper Networks, Inc.
An LSP configured with the
PCE-controlled LSP and is under the external control of a PCE by default. An active
stateful PCE can override the parameters set from the CLI, such as bandwidth, path
(ERO), and priority, for such PCE-controlled LSPs of the PCC.
To enable PCE to PCC communication, configure PCEP on the PCC at the
hierarchy level.
pcep { ... }
When configuring PCEP on a PCC, be aware of the following considerations:
The JSDN add-on package is required to be installed along with the core Junos OS
installation package.
Junos OS Release 12.3 supports only stateful PCEs.
A PCC can connect to a maximum of 10 stateful PCEs. At any given point in time, there
can be only one main PCE (the PCE with the lowest priority value, or the PCE that
connects to the PCC first in the absence of a PCE priority) to which the PCC delegates
LSPs for path computation.
For Junos OS Release 12.3, 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-controlled LSPs.
The auto-bandwidth option is turned off for PCE-controlled LSPs, although LSPs under
the control of auto-bandwdith and constraint-based routing can coexist with
PCE-controlled LSPs.
PCE-controlled LSPs can be referred to by other CLI configurations, such as lsp-nexthop
to routes, forwarding adjacencies, CCC connections, and logical tunnels.
PCE-controlled LSPs do not support GRES.
PCE-controlled LSPs under logical-systems are not supported.
PCE-controlled LSPs cannot be point-to-multipoint LSPs.
Bidirectional LSPs are not supported.
PCE-controlled LSPs cannot have secondary paths without a primary path.
PCE-controlled LSPs depend on external path computation, which impacts overall
setup time, reroutes, and make-before-break features.
Setup time and convergence time (reroute, MBB) for exisiting LSPs is the same as in
previous releases, in the absence of PCE-controlled LSPs. However, a small impact is
seen in the presence of PCE-controlled LSPs.
ERO computation time is expected to be significantly higher than local-CSPF.
Chapter 23: Configuring Path Computation Element Protocol (PCEP)
statement is referred to as a
lsp-external-controller
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