Lsp Behavior With External Computing - Juniper ACX1000 Configuration Manual

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Figure 39: Example PCE for MPLS RSVP-TE

This way, the stateful PCE provides a cooperative operation of distributed functionality

used to address specific challenges of a shortest interdomain constrained path

computation. It eliminates congestion scenarios in which traffic streams are inefficiently

mapped onto available resources, causing overutilization of some subsets of network

resources, while other resources remain underutilized.

LSP Behavior with External Computing

LSP Types on page 701

LSP Control Mode on page 702

In a client-side PCE implementation, there are three types of TE LSPs:

CLI-controlled LSPs—The LSPs that do not have the

statement configured are called CLI-controlled LSPs. Although these LSPs are under

local control, the PCC updates the connected PCEs with information about the

CLI-controlled LSPs during the initial LSP synchronization process. After the initial LSP

synchronization, the PCC informs the PCE of any new and deleted LSPs as well.

PCE-controlled LSPs—The LSPs that have the

configured are called PCE-controlled LSPs. The PCC delegates the PCC-initiated LSPs

to the main PCE for external path computation.

The PCC informs the PCE about the configured parameters of a PCE-controlled LSP,

such as bandwidth, ERO, and priorities. It also informs the PCE about the actual values

used for these parameters to set up the LSP including the RRO, when available.

The PCC sends such LSP status reports to the PCE only when a reconfiguration has

occurred or when there is a change in the ERO, RRO, or status of the PCE-controlled

LSPs under external control.

Chapter 23: Configuring Path Computation Element Protocol (PCEP)

lsp-external-controller pccd

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