PCEP
310
MPLS Guide
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4.2 Base Implementation of Path Computation
Elements (PCE)
The base implementation of the PCE uses the PCEP extensions defined in RFC
5440.
The main functions of PCEP are:
• PCEP session establishment, maintenance, and closing
• path computation requests using the PCReq message
• path computation replies using the PCRep message
• notification messages (PCNtf) by which the PCEP speaker can inform its peer
about events, such as path request cancellation by the PCC or path computation
cancellation by the PCE
• error messages (PCErr) by which the PCEP speaker can inform its peer about
errors related to processing requests, message objects, or TLVs
Table 32 lists the base PCEP TLVs, objects, and messages.
Table 32 Base PCEP TLVs, Objects, and Messages
TLV, Object, or Message Contained in
Object
Contained in Message
OPEN Object N/A OPEN, PCErr
Request Parameter (RP) Object N/A PCReq, PCRep, PCErr, PCNtf
NO-PATH Object N/A PCRep
END-POINTS Object N/A PCReq
BANDWIDTH Object N/A
PCReq, PCRep, PCRpt
1
METRIC Object N/A
PCReq, PCRep, PCRpt
1
Explicit Route Object (ERO) N/A PCRep
Reported Route Object (RRO) N/A PCReq
LSPA Object N/A
PCReq, PCRep, PCRpt
1
Include Route Object (IRO) N/A PCReq, PCRep
SVEC Object N/A PCReq
NOTIFICATION Object N/A PCNtf
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