Pcc-Initiated And Pce-Computed Or Pce-Controlled Lsps - Nokia 7705 SAR-W Series Manual

MPLS Guide
4.4.5 PCC-Initiated and PCE-Computed or PCE-
The following is the procedure for configuring and programming a PCC-initiated LSP
when control is delegated to the PCE.
Step 1. The LSP configuration is created on the PE router via CLI or via the OSS/
Step 2. PCC assigns a unique PLSP-ID to the LSP. The PLSP-ID uniquely
Step 3. The PE router does not validate the entered path. Note however that in the
Step 4. The PE router sends a PCReq message to the PCE to request a path for
Step 5. The PCE computes a new path, reserves the bandwidth, and returns the
Note: For the PCE to be able to use the SRLG path diversity and admin-group constraints
in the path computation, the user must configure the SRLG and admin-group membership
against the MPLS interface and make sure that the traffic-engineering option is enabled
in IGP. This causes IGP to flood the link SRLG and admin-group membership in its
participating area, and for PCE to learn it in its TE database.
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Controlled LSPs
NSP NFM-P.
The configuration dictates which PCE control mode is desired: active (pce-
control and pce-report options enabled) or passive (pce-computation
enabled and pce-control disabled).
identifies the LSP on a PCEP session and must remain constant during its
lifetime. PCC on the router must keep track of the association of the
PLSP-ID to the Tunnel-ID and Path-ID, and use the latter to communicate
with MPLS about a specific path of the LSP. PCC also uses the SRP-ID to
correlate PCRpt messages for each new path of the LSP.
7705 SAR, the PCE supports the computation of a path for an LSP with
empty-hops in its path definition. While PCC will include the IRO objects in
the PCReq message to PCE, the PCE will ignore them and compute the
path with the other constraints except the IRO.
the LSP, and includes the LSP parameters in the METRIC object, the
LSPA object, and the BANDWIDTH object. The PE router also includes the
LSP object with the assigned PLSP-ID. At this point, the PCC does not
delegate the control of the LSP to the PCE.
path in a PCRep message with the computed ERO in the ERO object. It
also includes the LSP object with the unique PLSP-ID, the METRIC object
with any computed metric value, and the BANDWIDTH object.
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