Path Computation Element Protocol (PCEP) Numbers

Created
2008-12-19
Last Updated
2026-08-06
Available Formats

XML
HTML
TXT

Registries Included Below

PCEP Messages

Reference
[RFC 5440]
Available Formats

CSV
Range Registration Procedures
0-251 IETF Review
252-255 Experimental Use
Value Description Reference
0 Reserved [RFC 5440]
1 Open [RFC 5440]
2 Keepalive [RFC 5440]
3 Path Computation Request [RFC 5440]
4 Path Computation Reply [RFC 5440]
5 Notification [RFC 5440]
6 Error [RFC 5440]
7 Close [RFC 5440]
8 Path Computation Monitoring Request (PCMonReq) [RFC 5886]
9 Path Computation Monitoring Reply (PCMonRep) [RFC 5886]
10 Report [RFC 8231]
11 Update [RFC 8231]
12 LSP Initiate Request [RFC 8281]
13 StartTLS [RFC 8253]
14-251 Unassigned
252-255 Experimental Use [RFC 8356]

PCEP Objects

Reference
[RFC 5440][RFC Errata 4956]
Available Formats

CSV
Range Registration Procedures
0-247 IETF Review
248-255 Experimental Use
Object-Class Value Name Object-Type Reference
0 Reserved 0-15: Reserved [RFC 5440][RFC Errata 4956]
1 OPEN 0: Reserved [RFC 5440][RFC Errata 4956]
1: Open [RFC 5440]
2-15: Unassigned
2 RP 0: Reserved [RFC 5440][RFC Errata 4956]
1: Request Parameters [RFC 5440]
2-15: Unassigned
3 NO-PATH 0: Reserved [RFC 5440][RFC Errata 4956]
1: No Path [RFC 5440]
2-15: Unassigned
4 END-POINTS 0: Reserved [RFC 5440][RFC Errata 4956]
1: IPv4 addresses [RFC 5440]
2: IPv6 addresses [RFC 5440]
3: IPv4 [RFC 8306]
4: IPv6 [RFC 8306]
5: Generalized Endpoint [RFC8779, Section 2.5]
6-15: Unassigned
5 BANDWIDTH 0: Reserved [RFC 5440][RFC Errata 4956]
1: Requested bandwidth [RFC 5440]
2: Bandwidth of an existing TE LSP for which a reoptimization is requested [RFC 5440]
3: Generalized bandwidth [RFC8779, Section 2.3]
4: Generalized bandwidth of an existing TE-LSP for which a reoptimization is requested [RFC8779, Section 2.3]
5-15: Unassigned
6 METRIC 0: Reserved [RFC 5440][RFC Errata 4956]
1: Metric [RFC 5440]
2-15: Unassigned
7 ERO 0: Reserved [RFC 5440][RFC Errata 4956]
1: Explicit Route [RFC 5440]
2-15: Unassigned
8 RRO 0: Reserved [RFC 5440][RFC Errata 4956]
1: Recorded Route [RFC 5440]
2-15: Unassigned
9 LSPA 0: Reserved [RFC 5440][RFC Errata 4956]
1: LSP Attributes [RFC 5440]
2-15: Unassigned
10 IRO 0: Reserved [RFC 5440][RFC Errata 4956]
1: Include Route [RFC 5440]
2-15: Unassigned
11 SVEC 0: Reserved [RFC 5440][RFC Errata 4956]
1: Synchronization Vector [RFC 5440]
2-15: Unassigned
12 NOTIFICATION 0: Reserved [RFC 5440][RFC Errata 4956]
1: Notification [RFC 5440]
2-15: Unassigned
13 PCEP-ERROR 0: Reserved [RFC 5440][RFC Errata 4956]
1: PCEP Error [RFC 5440]
2-15: Unassigned
14 LOAD-BALANCING 0: Reserved [RFC 5440][RFC Errata 4956]
1: Load Balancing [RFC 5440]
2: Generalized Load Balancing [RFC8779, Section 2.4]
3-15: Unassigned
15 CLOSE 0: Reserved [RFC 5440][RFC Errata 4956]
1: Close [RFC 5440]
2-15: Unassigned
16 PATH-KEY 0: Reserved [RFC 5520][RFC Errata 4956]
1: Path Key [RFC 5520]
2-15: Unassigned
17 XRO 0: Reserved [RFC 5521][RFC Errata 4956]
1: Route exclusion [RFC 5521]
2-15: Unassigned
18 Unassigned 0: Reserved [RFC Errata 4956]
1-15: Unassigned
19 MONITORING 0: Reserved [RFC 5886][RFC Errata 4956]
1: Monitoring [RFC 5886]
2-15: Unassigned
20 PCC-REQ-ID 0: Reserved [RFC 5886][RFC Errata 4956]
1: IPV4 Addresses [RFC 5886]
2: IPV6 Addresses [RFC 5886]
3-15: Unassigned
21 OF 0: Reserved [RFC 5541][RFC Errata 4956]
1: Objective Function [RFC 5541]
2-15: Unassigned
22 CLASSTYPE 0: Reserved [RFC 5455][RFC Errata 4956]
1: Class-Type [RFC 5455]
2-15: Unassigned
23 Unassigned 0: Reserved [RFC Errata 4956]
1-15: Unassigned
24 GLOBAL-CONSTRAINTS 0: Reserved [RFC 5557][RFC Errata 4956]
1: Global Constraints [RFC 5557]
2-15: Unassigned
25 PCE-ID 0: Reserved [RFC 5886][RFC Errata 4956]
1: IPV4 Addresses [RFC 5886]
2: IPV6 Addresses [RFC 5886]
3-15: Unassigned
26 PROC-TIME 0: Reserved [RFC 5886][RFC Errata 4956]
1: PROC-TIME [RFC 5886]
2-15: Unassigned
27 OVERLOAD 0: Reserved [RFC 5886][RFC Errata 4956]
1: overload [RFC 5886]
2-15: Unassigned
28 UNREACH-DESTINATION 0: Reserved [RFC 8306]
1: IPv4 [RFC 8306]
2: IPv6 [RFC 8306]
3-15: Unassigned
29 SERO 0: Reserved [RFC 8306]
1: SERO [RFC 8306]
2-15: Unassigned
30 SRRO 0: Reserved [RFC 8306]
1: SRRO [RFC 8306]
2-15: Unassigned
31 BNC 0: Reserved [RFC 8306]
1: Branch node list [RFC 8306]
2: Non-branch node list [RFC 8306]
3-15: Unassigned
32 LSP 0: Reserved [RFC 8231]
1: LSP [RFC 8231]
2-15: Unassigned
33 SRP 0: Reserved [RFC 8231]
1: SRP [RFC 8231]
2-15: Unassigned
34 VENDOR-INFORMATION 0: Reserved [RFC 7470][RFC Errata 4956]
1: Vendor-Specific Constraints [RFC 7470]
2-15: Unassigned
35 BU 0: Reserved [RFC 8233][RFC Errata 4956]
1: BU [RFC 8233]
2-15: Unassigned
36 INTER-LAYER 0: Reserved [RFC 8282]
1: Inter-layer [RFC 8282]
2-15: Unassigned
37 SWITCH-LAYER 0: Reserved [RFC 8282]
1: Switch-layer [RFC 8282]
2-15: Unassigned
38 REQ-ADAP-CAP 0: Reserved [RFC 8282]
1: Req-Adap-Cap [RFC 8282]
2-15: Unassigned
39 SERVER-INDICATION 0: Reserved [RFC 8282]
1: Server-indication [RFC 8282]
2-15: Unassigned
40 ASSOCIATION 0: Reserved [RFC 8697]
1: IPv4 [RFC 8697]
2: IPv6 [RFC 8697]
3-15: Unassigned
41 S2LS 0: Reserved [RFC 8623]
1: S2LS [RFC 8623]
2-15: Unassigned
42 WA 0: Reserved [RFC 8780]
1: Wavelength Assignment [RFC 8780]
2-15: Unassigned
43 FLOWSPEC 0: Reserved [RFC 9168]
1: Flow Specification [RFC 9168]
2-15: Unassigned
44 CCI Object-Type 0: Reserved [RFC 9050]
1: MPLS Label [RFC 9050]
2: Native IP [RFC 9757]
3: SR P2MP Policy (TEMPORARY - registered 2024-08-27, extension registered 2026-08-06, expires 2027-08-27) [draft-ietf-pce-sr-p2mp-policy-11]
4-15: Unassigned
45 PATH-ATTRIB 0: Reserved [RFC-ietf-pce-multipath-29]
1: PATH-ATTRIB [RFC-ietf-pce-multipath-29]
2-15: Unassigned
46 BGP Peer Info Object-Type 0: Reserved [RFC 9757]
1: IPv4 address [RFC 9757]
2: IPv6 address [RFC 9757]
3-15: Unassigned
47 Explicit Peer Route Object-Type 0: Reserved [RFC 9757]
1: IPv4 address [RFC 9757]
2: IPv6 address [RFC 9757]
3-15: Unassigned
48 Peer Prefix Advertisement Object-Type 0: Reserved [RFC 9757]
1: IPv4 address [RFC 9757]
2: IPv6 address [RFC 9757]
3-15: Unassigned
49-247 Unassigned 0: Reserved [RFC Errata 4956]
1-15: Unassigned
248-255 Experimental Use 0-15: Experimental Use [RFC 8356]

PCEP Message Common Header Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-4 Unassigned

Open Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-4 Unassigned

RP Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-14 Unassigned
15-16 Routing Granularity (RG) [RFC8779, Section 2.2]
17 Core-tree computation (C-bit) [RFC 7334]
18 Fragmentation (F-bit) [RFC 8306]
19 P2MP (N-bit) [RFC 8306]
20 ERO-compression (E-bit) [RFC 8306]
21 Make-before-break (M-bit) [RFC 5557]
22 Report the request order (D-bit) [RFC 5557]
23 Path Key (P-bit) [RFC 5520]
24 Supply OF on response [RFC 5541]
25 VSPT [RFC 5441]
26 Strict/Loose [RFC 5440]
27 Bi-directional [RFC 5440]
28 Reoptimization [RFC 5440]
29-31 Priority [RFC 5440]

NO-PATH Object NI Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Available Formats

CSV
Value Description Reference
0 No path satisfying the set of constraints could be found [RFC 5440]
1 PCE chain broken [RFC 5440]
2-255 Unassigned

NO-PATH Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0 Unsatisfied constrained indicated [RFC 5440]
1-15 Unassigned

METRIC Object T Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC 5440]
1 IGP metric [RFC 5440]
2 TE metric [RFC 5440]
3 Hop Counts [RFC 5440]
4 Aggregate bandwidth consumption [RFC 5541]
5 Load of the most loaded link [RFC 5541]
6 Cumulative IGP cost [RFC 5541]
7 Cumulative TE cost [RFC 5541]
8 P2MP IGP metric [RFC 8306]
9 P2MP TE metric [RFC 8306]
10 P2MP hop count metric [RFC 8306]
11 Segment-ID (SID) Depth. [RFC 8664]
12 Path Delay metric [RFC 8233]
13 Path Delay Variation metric [RFC 8233]
14 Path Loss metric [RFC 8233]
15 P2MP Path Delay metric [RFC 8233]
16 P2MP Path Delay variation metric [RFC 8233]
17 P2MP Path Loss metric [RFC 8233]
18 Number of adaptations on a path [RFC 8282]
19 Number of layers on a path [RFC 8282]
20 Domain Count metric [RFC 8685]
21 Border Node Count metric [RFC 8685]
22 Path Min Delay metric [RFC 9933]
23 P2MP Path Min Delay metric [RFC 9933]
24 Path Bandwidth metric [RFC 9933]
25 P2MP Path Bandwidth metric [RFC 9933]
26-127 Unassigned
128-255 User-defined metric [RFC 9933]

METRIC Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-5 Unassigned
6 Computed metric [RFC 5440]
7 Bound [RFC 5440]

LSPA Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-5 Unassigned
6 Protection Enforcement [RFC 9488]
7 Local Protection Desired [RFC 5440]

IRO Subobjects

Registration Procedure(s)
IETF Review
Reference
[RFC 5521]
Available Formats

CSV
Value Description Reference
1 IPv4 prefix [RFC 3209]
2 IPv6 prefix [RFC 3209]
3 Unassigned
4 Unnumbered Interface ID [RFC 3477]
5 4-byte AS number [RFC 7897][RFC 7898]
6 OSPF Area ID [RFC 7897][RFC 7898]
7 IS-IS Area ID [RFC 7897][RFC 7898]
8 Optical Interface Class List [RFC 8780]
9 Client Signal Information [RFC 8780]
10 Label [RFC 8779]
11-31 Unassigned
32 Autonomous system number [RFC 3209]
33 Explicit Exclusion Route subobject (EXRS) [RFC 4874]
34-127 Unassigned

SVEC Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-17 Unassigned
18 Domain Diverse O-bit [RFC 8685]
19 Partial Path Diverse [RFC 8306]
20 Link Direction Diverse [RFC 8306]
21 SRLG Diverse [RFC 5440]
22 Node Diverse [RFC 5440]
23 Link Diverse [RFC 5440]

Notification Object

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Available Formats

CSV
Notification-type Name Notification-value Reference
0 Reserved 1-255: Reserved [RFC 5440]
1 Pending Request cancelled 1: PCC cancels a set of pending requests [RFC 5440]
2: PCE cancels a set of pending requests [RFC 5440]
3-255: Unassigned
2 PCE Congestion 1: PCE in congested state [RFC 5440]
2: PCE no longer in congested state [RFC 5440]
3-255: Unassigned
3 Unassigned 1-255: Unassigned
4 Stateful PCE resource limit exceeded 0: Unassigned
1: Entering resource limit exceeded state [RFC 8231]
2: Deprecated [RFC 8231]
3-255: Unassigned
5 Auto-Bandwidth Overwhelm State 0: Unassigned
1: Entering Auto-Bandwidth Overwhelm State [RFC 8733]
2: Clearing Auto-Bandwidth Overwhelm State [RFC 8733]
3-255: Unassigned
6-255 Unassigned 1-255: Unassigned

Notification Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-7 Unassigned

PCEP-ERROR Object Error Types and Values

Reference
[RFC 5440][RFC 9756]
Available Formats

CSV
Range Registration Procedures Note
0-251 IETF Review The IETF Review procedure applies to all Error-values (0-255) for Error-Types in this range.
252-255 Experimental Use The Experimental Use policy applies to all Error-values (0-255) for Error-Types in this range.
Error-Type Meaning Error-value Reference
0 Reserved 0-255: Reserved [RFC 5440]
1 PCEP session establishment failure 0: Unassigned [RFC 5440]
1: reception of an invalid Open message or a non Open message. [RFC 5440]
2: no Open message received before the expiration of the OpenWait timer [RFC 5440]
3: unacceptable and non negotiable session characteristics [RFC 5440]
4: unacceptable but negotiable session characteristics [RFC 5440]
5: reception of a second Open message with still unacceptable session characteristics [RFC 5440]
6: reception of a PCErr message proposing unacceptable session characteristics [RFC 5440]
7: No Keepalive or PCErr message received before the expiration of the KeepWait timer [RFC 5440]
8: PCEP version not supported [RFC 5440]
9-255: Unassigned
2 Capability not supported 0-255: Unassigned [RFC 5440]
3 Unknown Object 0: Unassigned [RFC 5440]
1: Unrecognized object class [RFC 5440]
2: Unrecognized object Type [RFC 5440]
3-255: Unassigned
4 Not supported object 0: Unassigned [RFC 5440]
1: Not supported object class [RFC 5440]
2: Not supported object Type [RFC 5440]
3: Unassigned
4: Unsupported parameter [RFC 5441]
5: Unsupported network performance constraint [RFC 8233]
6: BANDWIDTH object type 3 or 4 not supported [RFC 8779]
7: Unsupported endpoint type in END-POINTS Generalized Endpoint object type [RFC 8779]
8: Unsupported TLV present in END-POINTS Generalized Endpoint object type [RFC 8779]
9: Unsupported granularity in the RP object flags [RFC 8779]
10-255: Unassigned
5 Policy violation 0: Unassigned [RFC 5440]
1: C bit of the METRIC object set (request rejected) [RFC 5440]
2: O bit of the RP object cleared (request rejected) [RFC 5440]
3: objective function not allowed (request rejected) [RFC 5541]
4: OF bit of the RP object set (request rejected) [RFC 5541]
5: Global concurrent optimization not allowed [RFC 5557]
6: Monitoring message supported but rejected due to policy violation [RFC 5886]
7: P2MP Path computation is not allowed [RFC 8306]
8: Not allowed network performance constraint [RFC 8233]
9-255: Unassigned
6 Mandatory Object missing 0: Unassigned [RFC 5440]
1: RP object missing [RFC 5440]
2: RRO missing for a reoptimization request (R bit of the RP object set) [RFC 5440]
3: END-POINTS object missing [RFC 5440]
4: MONITORING object missing [RFC 5886]
5-7: Unassigned
8: LSP object missing [RFC 8231]
9: ERO object missing [RFC 8231]
10: SRP object missing [RFC 8231]
11: LSP-IDENTIFIERS TLV missing [RFC 8231]
12: LSP-DB-VERSION TLV missing [RFC 8232]
13: S2LS object missing [RFC 8623]
14: P2MP-LSP-IDENTIFIERS TLV missing [RFC 8623]
15: DISJOINTNESS-CONFIGURATION TLV missing [RFC 8800]
16: Scheduled TLV missing [RFC 8934]
17: CCI object missing [RFC 9050]
18: VIRTUAL-NETWORK-TLV missing [RFC 9358]
19: Native IP object missing [RFC 9757]
20: LABEL-REQUEST TLV missing [RFC 9504]
21: Missing SR Policy Mandatory TLV [RFC 9862]
22: Missing SR Policy Association [RFC 9862]
23-255: Unassigned
7 Synchronized path computation request missing 0-255: Unassigned [RFC 5440]
8 Unknown request reference 0-255: Unassigned [RFC 5440]
9 Attempt to establish a second PCEP session 0-255: Unassigned [RFC 5440]
10 Reception of an invalid object 0: Unassigned [RFC 5440]
1: Reception of an object with P flag not set although the P-flag must be set according to this specification. [RFC 5440]
2: Bad label value [RFC 8664]
3: Unsupported number of SR-ERO subobjects [RFC 8664]
4: Bad label format [RFC 8664]
5: ERO mixes SR-ERO subobjects with other subobject types [RFC 8664]
6: Both SID and NAI are absent in the SR-ERO subobject [RFC 8664]
7: Both SID and NAI are absent in the SR-RRO subobject [RFC 8664]
8: SYMBOLIC-PATH-NAME TLV missing [RFC 8281]
9: MSD exceeds the default for the PCEP session [RFC 8664]
10: RRO mixes SR-RRO subobjects with other subobject types [RFC 8664]
11: Malformed object [RFC 8408]
12: Missing PCE-SR-CAPABILITY sub-TLV [RFC 8664]
13: Unsupported NAI Type in the SR-ERO/SR-RRO subobject [RFC 8664]
14: Unknown SID [RFC 8664]
15: NAI cannot be resolved to a SID [RFC 8664]
16: Could not find SRGB [RFC 8664]
17: SID index exceeds SRGB size [RFC 8664]
18: Could not find SRLB [RFC 8664]
19: SID index exceeds SRLB size [RFC 8664]
20: Inconsistent SIDs in SR-ERO / SR-RRO subobjects [RFC 8664]
21: MSD must be nonzero [RFC 8664]
22: Mismatch of O field in S2LS and LSP object [RFC 8623]
23: Incompatible OF codes in H-PCE [RFC 8685]
24: Bad BANDWIDTH object type 3 or 4 [RFC 8779]
25: Unsupported LSP Protection Flags in PROTECTION-ATTRIBUTE TLV [RFC 8779]
26: Unsupported Secondary LSP Protection Flags in PROTECTION-ATTRIBUTE TLV [RFC 8779]
27: Unsupported Link Protection Type in PROTECTION-ATTRIBUTE TLV [RFC 8779]
28: LABEL-SET TLV present with O bit set but without R bit set in RP [RFC 8779]
29: Wrong LABEL-SET TLV present with O and L bits set [RFC 8779]
30: Wrong LABEL-SET TLV present with O bit set and wrong format [RFC 8779]
31: Missing GMPLS-CAPABILITY TLV [RFC 8779]
32: Incompatible OF code [RFC 8800]
33: Missing PCECC Capability sub-TLV [RFC 9050]
34: Missing PCE-SRv6-CAPABILITY sub-TLV [RFC 9603]
35: Both SID and NAI are absent in SRv6-RRO subobject [RFC 9603]
36: RRO mixes SRv6-RRO subobjects with other subobject types [RFC 9603]
37: Invalid SRv6 SID Structure [RFC 9603]
38: Conflicting Path ID [RFC-ietf-pce-multipath-29]
39: PCECC NATIVE-IP-TE-CAPABILITY bit is not set [RFC 9757]
40: Unsupported number of SRv6-ERO subobjects [RFC 9603]
41: Unsupported NAI Type in the SRv6-ERO/SRv6-RRO subobject [RFC 9603]
42: Both SID and NAI are absent in the SRv6-ERO subobject [RFC 9603]
43: ERO mixes SRv6-ERO subobjects with other subobject types [RFC 9603]
44: Missing SRPOLICY-CAPABILITY TLV [RFC 9862]
45: Unexpected PATH-ATTRIB Object [RFC-ietf-pce-multipath-29]
46-255: Unassigned
11 Unrecognized EXRS subobject 0-255: Unassigned [RFC 5521]
12 Diffserv-aware TE error 0: Unassigned [RFC 5455]
1: Unsupported class-type [RFC 5455]
2: Invalid class-type [RFC 5455]
3: Class-Type and setup priority do not form a configured TE-class [RFC 5455]
4-255: Unassigned
13 BRPC procedure completion failure 0: Unassigned [RFC 5441]
1: BRPC procedure not supported by one or more PCEs along the domain path [RFC 5441]
2-255: Unassigned
14 Unassigned 0-255: Unassigned
15 Global Concurrent Optimization Error 0: Unassigned [RFC 5557]
1: Insufficient memory [RFC 5557]
2: Global concurrent optimization not supported [RFC 5557]
3-255: Unassigned
16 P2MP Capability Error 0: Unassigned [RFC 8306]
1: The PCE cannot satisfy the request due to insufficient memory [RFC 8306]
2: The PCE is not capable of P2MP computation [RFC 8306]
3-255: Unassigned
17 P2MP END-POINTS Error 0: Unassigned [RFC 8306]
1: The PCE cannot satisfy the request due to no END-POINTS with leaf type 2 [RFC 8306]
2: The PCE cannot satisfy the request due to no END-POINTS with leaf type 3 [RFC 8306]
3: The PCE cannot satisfy the request due to no END-POINTS with leaf type 4 [RFC 8306]
4: The PCE cannot satisfy the request due to inconsistent END-POINTS [RFC 8306]
5-255: Unassigned
18 P2MP Fragmentation Error 0: Unassigned [RFC 8306]
1: Fragmented request failure [RFC 8306]
2: Fragmented Report failure [RFC 8623]
3: Fragmented Update failure [RFC 8623]
4: Fragmented Instantiation failure [RFC 8623]
5-255: Unassigned
19 Invalid Operation 0: Unassigned [RFC 8231]
1: Attempted LSP Update Request for a non-delegated LSP. The PCEP-ERROR object is followed by the LSP object that identifies the LSP. [RFC 8231]
2: Attempted LSP Update Request if the stateful PCE capability was not advertised. [RFC 8231]
3: Attempted LSP Update Request for an LSP identified by an unknown PLSP-ID. [RFC 8231]
4: Unassigned
5: Attempted LSP State Report if active stateful PCE capability was not advertised. [RFC 8231]
6: PCE-initiated LSP limit reached [RFC 8281]
7: Delegation for PCE-initiated LSP cannot be revoked [RFC 8281]
8: Non-zero PLSP-ID in LSP Initiate Request [RFC 8281]
9: LSP is not PCE initiated [RFC 8281]
10: PCE-initiated operation-frequency limit reached [RFC 8281]
11: Attempted LSP State Report for P2MP if stateful PCE capability for P2MP was not advertised [RFC 8623]
12: Attempted LSP Update Request for P2MP if active stateful PCE capability for P2MP was not advertised [RFC 8623]
13: Attempted LSP Instantiation Request for P2MP if stateful PCE instantiation capability for P2MP was not advertised [RFC 8623]
14: Auto-Bandwidth capability was not advertised [RFC 8733]
15: Attempted LSP scheduling while the scheduling capability was not advertised [RFC 8934]
16: Attempted PCECC operations when PCECC capability was not advertised [RFC 9050]
17: Stateful PCE capability was not advertised [RFC 9050]
18: Unknown Label [RFC 9050]
19: Attempted SRv6 when the capability was not advertised [RFC 9603]
20: Not supported path backup (TEMPORARY - registered 2022-05-09, extension registered 2026-04-03, expires 2027-05-09) [draft-ietf-pce-sr-p2mp-policy-17]
21: Non-empty path [RFC-ietf-pce-multipath-29]
22: Only one BPI, EPR, or PPA object can be included in this message [RFC 9757]
23: LSP state info unavailable for reoptimization [RFC 9504]
24: LSP state info for route exclusion not found [RFC 9504]
25: Attempted LSP update request for GMPLS if stateful PCE capability not advertised [RFC 9504]
26: Attempted LSP State Report for GMPLS if stateful PCE capability not advertised [RFC 9504]
27: Attempted LSP instantiation request for GMPLS if stateful PCE instantiation capability not advertised [RFC 9504]
28: Use of the Generalized Endpoint object type for non-GMPLS LSPs [RFC 9504]
29: Attempted Native IP operations when the capability was not advertised [RFC 9757]
30: Unknown Native IP Info [RFC 9757]
31: Invalid Color [RFC 9863]
32: Inconsistent Color [RFC 9863]
33: Attempted use of SR-Algorithm without advertised capability [RFC 9933]
34: Unsupported combination of constraints [RFC 9933]
35: Path modification is blocked by constraint [RFC-ietf-pce-circuit-style-pcep-extensions-16]
36: Unsupported multipath capability [RFC-ietf-pce-multipath-29]
37: Invalid opposite-direction path mapping [RFC-ietf-pce-multipath-29]
38: LOAD-BALANCING and MULTIPATH-CAP TLV in the same request [RFC-ietf-pce-multipath-29]
39-255: Unassigned
20 LSP State Synchronization Error 0: Unassigned [RFC 8231]
1: A PCE indicates to a PCC that it cannot process (an otherwise valid) LSP State Report. The PCEP- ERROR object is followed by the LSP object that identifies the LSP. [RFC 8231]
2: LSP-DB version mismatch. [RFC 8232]
3: Attempt to trigger synchronization before PCE trigger. [RFC 8232]
4: Attempt to trigger a synchronization when the PCE triggered synchronization capability has not been advertised. [RFC 8232]
5: A PCC indicates to a PCE that it cannot complete the State Synchronization. [RFC 8231]
6: Received an invalid LSP-DB Version Number. [RFC 8232]
7: Received an invalid Speaker Entity Identifier. [RFC 8232]
8-255: Unassigned
21 Invalid traffic engineering path setup type 0: Unassigned [RFC 8408]
1: Unsupported path setup type [RFC 8408]
2: Mismatched path setup type [RFC 8408]
3-255: Unassigned
22 Unassigned 0-255: Unassigned
23 Bad parameter value 0: Unassigned [RFC 8281]
1: SYMBOLIC-PATH-NAME in use [RFC 8281]
2: Speaker identity included for an LSP that is not PCE initiated [RFC 8281]
3-255: Unassigned
24 LSP instantiation error 0: Unassigned [RFC 8281]
1: Unacceptable instantiation parameters [RFC 8281]
2: Internal error [RFC 8281]
3: Signaling error [RFC 8281]
4-255: Unassigned
25 PCEP StartTLS failure 0: Unassigned [RFC 8253]
1: Reception of StartTLS after any PCEP exchange [RFC 8253]
2: Reception of any other message apart from StartTLS, Open, or PCErr [RFC 8253]
3: Failure, connection without TLS is not possible [RFC 8253]
4: Failure, connection without TLS is possible [RFC 8253]
5: No StartTLS message (nor PCErr/Open) before StartTLSWait timer expiry [RFC 8253]
6-255: Unassigned
26 Association Error 0: Unassigned [RFC 8697]
1: Association Type is not supported [RFC 8697]
2: Too many LSPs in the association group [RFC 8697]
3: Too many association groups [RFC 8697]
4: Association unknown [RFC 8697]
5: Operator-configured association information mismatch [RFC 8697]
6: Association information mismatch [RFC 8697]
7: Cannot join the association group [RFC 8697]
8: Association ID not in range [RFC 8697]
9: Tunnel ID or End points mismatch for Path Protection Association [RFC 8745]
10: Attempt to add another working/protection LSP for Path Protection Association [RFC 8745]
11: Protection type is not supported [RFC 8745]
12: Not expecting policy parameters [RFC 9005]
13: Unacceptable policy parameters [RFC 9005]
14: Association group mismatch [RFC 9059]
15: Tunnel mismatch in the association group [RFC 9059]
16: Path Setup Type not supported [RFC 9059]
17: Bidirectional LSP direction mismatch [RFC 9059]
18: Bidirectional LSP co-routed mismatch [RFC 9059]
19: Endpoint mismatch in the association group [RFC 9059]
20: SR Policy Identifiers Mismatch [RFC 9862]
21: SR Policy Candidate Path Identifier Mismatch [RFC 9862]
22-255: Unassigned
27 WSON RWA error 0: Unassigned [RFC 8780]
1: Insufficient memory [RFC 8780]
2: RWA computation not supported [RFC 8780]
3: Syntactical encoding error [RFC 8780]
4-255: Unassigned
28 H-PCE Error 0: Unassigned [RFC 8685]
1: H-PCE Capability not advertised [RFC 8685]
2: Parent PCE Capability cannot be provided [RFC 8685]
3-255: Unassigned
29 Path computation failure 0: Unassigned [RFC 8779]
1: Unacceptable request message [RFC 8779]
2: Generalized bandwidth value not supported [RFC 8779]
3: Label set constraint could not be met [RFC 8779]
4: Label constraint could not be met [RFC 8779]
5: Constraints could not be met for some intervals [RFC 8934]
6-255: Unassigned
30 FlowSpec error 0: Unassigned [RFC 9168]
1: Unsupported FlowSpec [RFC 9168]
2: Malformed FlowSpec [RFC 9168]
3: Unresolvable Conflict [RFC 9168]
4: Unknown FlowSpec [RFC 9168]
5: Unsupported LPM Route [RFC 9168]
6-255: Unassigned
31 PCECC failure 0: Unassigned [RFC 9050]
1: Label out of range [RFC 9050]
2: Instruction failed [RFC 9050]
3: Invalid CCI [RFC 9050]
4: Unable to allocate the specified CCI [RFC 9050]
5: Invalid next-hop information [RFC 9050]
6-255: Unassigned
32 Binding label/SID failure 0: Unassigned [RFC 9604]
1: Invalid SID [RFC 9604]
2: Unable to allocate the specified binding value [RFC 9604]
3: Unable to allocate a new binding label/SID [RFC 9604]
4: Unable to remove the binding value [RFC 9604]
5: Inconsistent binding types [RFC 9604]
6-255: Unassigned
33 Native IP TE failure 0: Unassigned [RFC 9757]
1: Local IP is in use [RFC 9757]
2: Remote IP is in use [RFC 9757]
3: Explicit Peer Route Error [RFC 9757]
4: EPR/BPI Peer Info mismatch [RFC 9757]
5: BPI/PPA Address Family mismatch [RFC 9757]
6: PPA/BPI Peer Info mismatch [RFC 9757]
7-255: Unassigned
34-251 Unassigned 0-255: Unassigned
252-255 Reserved for Experimental Use 0-255: Reserved for Experimental Use [RFC 9756]

PCEP-ERROR Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-7 Unassigned

LOAD-BALANCING Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-7 Unassigned

CLOSE Object Reason Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC 5440]
1 No explanation provided [RFC 5440]
2 DeadTimer expired [RFC 5440]
3 Reception of a malformed PCEP message [RFC 5440]
4 Reception of an unacceptable number of unknown requests/replies [RFC 5440]
5 Reception of an unacceptable number of unrecognized PCEP messages [RFC 5440]
6-255 Unassigned

CLOSE Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-7 Unassigned

PATH-KEY Subobjects

Registration Procedure(s)
IETF Review
Reference
[RFC 5520]
Available Formats

CSV
Value Description Reference
1-63 Unassigned
64 Path Key with 32-bit PCE ID [RFC 5520]
65 Path Key with 128-bit PCE ID [RFC 5520]
66-127 Unassigned

XRO Subobjects

Registration Procedure(s)
IETF Review
Reference
[RFC 5521]
Available Formats

CSV
Value Description Reference
1 IPv4 prefix [RFC 3209]
2 IPv6 prefix [RFC 3209]
3 Unassigned
4 Unnumbered Interface ID [RFC 3477]
5 4-byte AS number [RFC 7897][RFC 7898]
6 OSPF Area ID [RFC 7897][RFC 7898]
7 IS-IS Area ID [RFC 7897][RFC 7898]
8 Optical Interface Class List [RFC 8780]
9 Client Signal Information [RFC 8780]
10 Label [RFC 8779]
11 LSP [RFC 9504]
12-31 Unassigned
32 Autonomous system number [RFC 3209]
33 Unassigned
34 SRLG [RFC 4874]
35-63 Unassigned
64 IPv4 Path Key [RFC 5520]
65 IPv6 Path Key [RFC 5520]
66-127 Unassigned

XRO Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5521]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-14 Unassigned
15 Fail (F-bit) [RFC 5521]

Objective Function

Reference
[RFC 5541]
Available Formats

CSV
Range Registration Procedures
1-1023 IETF Review
1024-32767 First Come First Served
32768-65535 Reserved for Private Use
Code Point Name Reference
0 Reserved [RFC 5541]
1 MCP [RFC 5541]
2 MLP [RFC 5541]
3 MBP [RFC 5541]
4 MBC [RFC 5541]
5 MLL [RFC 5541]
6 MCC [RFC 5541]
7 SPT [RFC 8306]
8 MCT [RFC 8306]
9 Minimum Packet Loss Path (MPLP) [RFC 8233]
10 Maximum Under-Utilized Path (MUP) [RFC 8233]
11 Maximum Reserved Under-Utilized Path (MRUP) [RFC 8233]
12 Minimize the number of Transit Domains (MTD) [RFC 8685]
13 Minimize the number of Border Nodes (MBN) [RFC 8685]
14 Minimize the number of Common Transit Domains (MCTD) [RFC 8685]
15 Minimize the number of Shared Links (MSL) [RFC 8800]
16 Minimize the number of Shared SRLGs (MSS) [RFC 8800]
17 Minimize the number of Shared Nodes (MSN) [RFC 8800]
18-32767 Unassigned
32768-65535 Reserved for Private Use [RFC 5541]

PCEP TLV Type Indicators

Reference
[RFC 5440]
Available Formats

CSV
Range Registration Procedures
0-65503 IETF Review
65504-65535 Experimental Use
Value Description Reference
0 Reserved [RFC 5440]
1 NO-PATH-VECTOR TLV [RFC 5440]
2 OVERLOADED-DURATION TLV [RFC 5440][RFC Errata 8344]
3 REQ-MISSING TLV [RFC 5440]
4 OF-List [RFC 5541]
5 Order TLV [RFC 5557]
6 P2MP capable [RFC 8306]
7 VENDOR-INFORMATION-TLV [RFC 7470]
8 Wavelength Selection [RFC 8780]
9 Wavelength Restriction [RFC 8780]
10 Wavelength Allocation [RFC 8780]
11 Optical Interface Class List [RFC 8780]
12 Client Signal Information [RFC 8780]
13 H-PCE-CAPABILITY [RFC 8685]
14 Domain-ID [RFC 8685]
15 H-PCE-FLAG [RFC 8685]
16 STATEFUL-PCE-CAPABILITY [RFC 8231]
17 SYMBOLIC-PATH-NAME [RFC 8231]
18 IPV4-LSP-IDENTIFIERS [RFC 8231]
19 IPV6-LSP-IDENTIFIERS [RFC 8231]
20 LSP-ERROR-CODE [RFC 8231]
21 RSVP-ERROR-SPEC [RFC 8231]
22 Unassigned
23 LSP-DB-VERSION [RFC 8232]
24 SPEAKER-ENTITY-ID [RFC 8232]
25 Unassigned
26 SR-PCE-CAPABILITY (deprecated) [RFC 8664]
27 Unassigned
28 PATH-SETUP-TYPE [RFC 8408]
29 Operator-configured Association Range [RFC 8697]
30 Global Association Source [RFC 8697]
31 Extended Association ID [RFC 8697]
32 P2MP-IPV4-LSP-IDENTIFIERS [RFC 8623]
33 P2MP-IPV6-LSP-IDENTIFIERS [RFC 8623]
34 PATH-SETUP-TYPE-CAPABILITY [RFC 8408]
35 ASSOC-Type-List [RFC 8697]
36 AUTO-BANDWIDTH-CAPABILITY [RFC 8733]
37 AUTO-BANDWIDTH-ATTRIBUTES [RFC 8733]
38 Path Protection Association Group TLV [RFC 8745]
39 IPV4-ADDRESS [RFC8779, Section 2.5.2.1]
40 IPV6-ADDRESS [RFC8779, Section 2.5.2.2]
41 UNNUMBERED-ENDPOINT [RFC8779, Section 2.5.2.3]
42 LABEL-REQUEST [RFC8779, Section 2.5.2.4]
43 LABEL-SET [RFC8779, Section 2.5.2.5]
44 PROTECTION-ATTRIBUTE [RFC8779, Section 2.8]
45 GMPLS-CAPABILITY [RFC8779, Section 2.1.2]
46 DISJOINTNESS-CONFIGURATION [RFC 8800]
47 DISJOINTNESS-STATUS [RFC 8800]
48 POLICY-PARAMETERS-TLV [RFC 9005]
49 SCHED-LSP-ATTRIBUTE [RFC 8934]
50 SCHED-PD-LSP-ATTRIBUTE [RFC 8934]
51 PCE-FLOWSPEC-CAPABILITY TLV [RFC 9168]
52 FLOW FILTER TLV [RFC 9168]
53 Unassigned
54 Bidirectional LSP Association Group TLV [RFC 9059]
55 TE-PATH-BINDING [RFC 9604]
56 SRPOLICY-POL-NAME [RFC 9862]
57 SRPOLICY-CPATH-ID [RFC 9862]
58 SRPOLICY-CPATH-NAME [RFC 9862]
59 SRPOLICY-CPATH-PREFERENCE [RFC 9862]
60 MULTIPATH-CAP [RFC-ietf-pce-multipath-29]
61 MULTIPATH-WEIGHT [RFC-ietf-pce-multipath-29]
62 MULTIPATH-BACKUP (TEMPORARY - registered 2022-05-09, extension registered 2026-04-03, expires 2027-05-09) [draft-ietf-pce-sr-p2mp-policy-17]
63 MULTIPATH-OPPDIR-PATH [RFC-ietf-pce-multipath-29]
64 LSP-EXTENDED-FLAG [RFC 9357]
65 VIRTUAL-NETWORK-TLV [RFC 9358]
66 SR-Algorithm [RFC 9933]
67 Color [RFC 9863]
68 COMPUTATION-PRIORITY [RFC 9862]
69 EXPLICIT-NULL-LABEL-POLICY [RFC 9862]
70 INVALIDATION [RFC 9862]
71 SRPOLICY-CAPABILITY [RFC 9862]
72 PATH-MODIFICATION TLV [RFC-ietf-pce-circuit-style-pcep-extensions-16]
73 SR-P2MP-POLICY-CAPABILITY (TEMPORARY - registered 2024-08-27, extension registered 2026-08-06, expires 2027-08-27) [draft-ietf-pce-sr-p2mp-policy-11]
74 IPV4-SR-P2MP-INSTANCE-ID TLV (TEMPORARY - registered 2024-08-27, extension registered 2026-08-06, expires 2027-08-27) [draft-ietf-pce-sr-p2mp-policy-11]
75 IPV6-SR-P2MP-INSTANCE-ID TLV (TEMPORARY - registered 2024-08-27, extension registered 2026-08-06, expires 2027-08-27) [draft-ietf-pce-sr-p2mp-policy-11]
76 MULTIPATH-FORWARD-CLASS [RFC-ietf-pce-multipath-29]
77-65503 Unassigned
65504-65535 Experimental Use [RFC 8356]

NO-PATH-VECTOR TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5440]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-9 Unassigned
10 Requested disjoint computation not supported [RFC 8800]
11 Disjoint path not found [RFC 8800]
12 LOAD-BALANCING could not be performed with the bandwidth constraints [RFC 8779]
13 No label resource in range [RFC 8779]
14 No endpoint label resource in range [RFC 8779]
15 No endpoint label resource [RFC 8779]
16 Granularity not supported [RFC 8779]
17 No Resource [RFC 8779]
18 Protection Mismatch [RFC 8779]
19 Destination is not found in the indicated domain [RFC 8685]
20 No available resource in one or more domains [RFC 8685]
21 Unresponsive child PCE(s) [RFC 8685]
22 Destination domain unknown [RFC 8685]
23 No RWA constraints met [RFC 8780]
24 P2MP Reachability Problem [RFC 8306]
25 No GCO solution found [RFC 5557]
26 No GCO migration path found [RFC 5557]
27 PKS expansion failure [RFC 5520]
28 BRPC Path computation chain unavailable [RFC 5441]
29 Unknown Source [RFC 5440]
30 Unknown Destination [RFC 5440]
31 PCE currently Unavailable [RFC 5440]

MONITORING Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5886]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-18 Unassigned
19 Incomplete [RFC 5886]
20 Overload [RFC 5886]
21 Processing Time [RFC 5886]
22 General [RFC 5886]
23 Liveness [RFC 5886]

PROC-TIME Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 5886]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-14 Unassigned
15 Estimated [RFC 5886]

OVERLOAD Object Flag field

Registration Procedure(s)
IETF Review
Reference
[RFC 5886]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0-7 Unassigned

BU Object Type Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8233][RFC 9756]
Available Formats

CSV
Type Name Reference
0 Reserved [RFC 8233]
1 LBU (Link Bandwidth Utilization) [RFC 8233]
2 LRBU (Link Residual Bandwidth Utilization) [RFC 8233]
3-255 Unassigned

Inter-Layer Object Path Property Bits

Registration Procedure(s)
IETF Review
Reference
[RFC 8282]
Available Formats

CSV
Bit Flag Multi-Layer Path Property Reference
0-28 Unassigned
29 T Triggered Signaling Allowed [RFC 8282]
30 M Multi-Layer Requested [RFC 8282]
31 I Inter-Layer Allowed [RFC 8282]

LSP Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8231][RFC 9756]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Bit Description Reference
0 PCE-allocation [RFC 9604]
1 ERO-compression [RFC 8623]
2 Fragmentation [RFC 8623]
3 P2MP [RFC 8623]
4 Create [RFC 8281]
5-7 Operational (3 bits) [RFC 8231]
8 Administrative [RFC 8231]
9 Remove [RFC 8231]
10 SYNC [RFC 8231]
11 Delegate [RFC 8231]

STATEFUL-PCE-CAPABILITY TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8231][RFC 9756]
Note
Bits are numbered from bit 0 as the most significant bit.
Available Formats

CSV
Value Description Reference
0-16 Unassigned
17 RELAX [RFC 9753]
18 STRICT-PATH-CAPABILITY [RFC-ietf-pce-circuit-style-pcep-extensions-16]
19 PATH-MODIFICATION-CAPABILITY [RFC-ietf-pce-circuit-style-pcep-extensions-16]
20 COLOR-CAPABILITY [RFC 9863]
21 PD-LSP-CAPABILITY (PD-bit) [RFC 8934]
22 LSP-SCHEDULING-CAPABILITY (B-bit) [RFC 8934]
23 P2MP-LSP-INSTANTIATION-CAPABILITY [RFC 8623]
24 P2MP-LSP-UPDATE-CAPABILITY [RFC 8623]
25 P2MP-CAPABILITY [RFC 8623]
26 TRIGGERED-INITIAL-SYNC [RFC 8232]
27 DELTA-LSP-SYNC-CAPABILITY [RFC 8232]
28 TRIGGERED-RESYNC [RFC 8232]
29 LSP-INSTANTIATION-CAPABILITY (I) [RFC 8281]
30 INCLUDE-DB-VERSION [RFC 8232]
31 LSP-UPDATE-CAPABILITY [RFC 8231]

LSP-ERROR-CODE TLV Error Code Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8231][RFC 9756]
Available Formats

CSV
Value Meaning Reference
0 Reserved [RFC 8231]
1 Unknown reason [RFC 8231]
2 Limit reached for PCE-controlled LSPs [RFC 8231]
3 Too many pending LSP update requests [RFC 8231]
4 Unacceptable parameters [RFC 8231]
5 Internal error [RFC 8231]
6 LSP administratively brought down [RFC 8231]
7 LSP preempted [RFC 8231]
8 RSVP signaling error [RFC 8231]
9 Deprecated (Unsupported Color) [RFC 9863]
10 SID Verification fails [RFC 9603]
11-65535 Unassigned

SRP Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8281][RFC 8786][RFC 9756]
Available Formats

CSV
Value Description Reference
0-29 Unassigned
30 LSP Control Request [RFC 8741]
31 LSP-Remove [RFC 8281]

PCEP Path Setup Types

Registration Procedure(s)
IETF Review
Reference
[RFC 8408]
Available Formats

CSV
Value Description Reference
0 Path is set up using the RSVP-TE signaling protocol [RFC 8408]
1 Traffic-engineering path is set up using Segment Routing. [RFC 8664]
2 Traffic engineering path is set up using PCECC mode [RFC 9050]
3 Traffic engineering path is set up using SRv6. [RFC 9603]
4 Native IP TE Path [RFC 9757]
5-255 Unassigned

PCEP SR-ERO NAI Types

Registration Procedure(s)
IETF Review
Reference
[RFC 8664]
Available Formats

CSV
Value Description Reference
0 NAI is absent. [RFC 8664]
1 NAI is an IPv4 node ID. [RFC 8664]
2 NAI is an IPv6 node ID. [RFC 8664]
3 NAI is an IPv4 adjacency. [RFC 8664]
4 NAI is an IPv6 adjacency with global IPv6 addresses. [RFC 8664]
5 NAI is an unnumbered adjacency with IPv4 node IDs. [RFC 8664]
6 NAI is an IPv6 adjacency with link-local IPv6 addresses. [RFC 8664]
7-15 Unassigned

SR-ERO Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8664][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-6 Unassigned
7 SR-Algorithm Flag (A) [RFC 9933]
8 NAI is absent (F) [RFC 8664]
9 SID is absent (S) [RFC 8664]
10 SID specifies TC, S, and TTL in addition to an MPLS label (C) [RFC 8664]
11 SID specifies an MPLS label (M) [RFC 8664]

PATH-SETUP-TYPE-CAPABILITY Sub-TLV Type Indicators

Registration Procedure(s)
IETF Review
Reference
[RFC 8664][RFC 9756]
Available Formats

CSV
Value Meaning Reference
0 Reserved [RFC 8664]
1 PCECC-CAPABILITY [RFC 9050]
2-25 Unassigned
26 SR-PCE-CAPABILITY [RFC 8664]
27 SRv6-PCE-CAPABILITY [RFC 9603]
28-65535 Unassigned

SR Capability Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8664][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-4 Unassigned
5 SR-Algorithm Capability [RFC 9933]
6 Node or Adjacency Identifier (NAI) is supported (N) [RFC 8664]
7 Unlimited Maximum SID Depth (X) [RFC 8664]

WA Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8780][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-14 Unassigned
15 Wavelength Allocation Mode [RFC 8780]

Wavelength Restriction TLV Action Values

Registration Procedure(s)
IETF Review
Reference
[RFC 8780][RFC 9756]
Available Formats

CSV
Value Meaning Reference
0 Inclusive List [RFC 8780]
1 Inclusive Range [RFC 8780]
2-255 Unassigned

Wavelength Allocation TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8780][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-14 Unassigned
15 Wavelength Allocation Mode [RFC 8780]

S2LS Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8623][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-28 Unassigned
29-31 Operational (3 bits) [RFC 8623]

H-PCE-CAPABILITY TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8685][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-30 Unassigned
31 P (Parent PCE Request bit) [RFC 8685]

Domain-ID TLV Domain Type

Registration Procedure(s)
IETF Review
Reference
[RFC 8685]
Available Formats

CSV
Value Meaning Reference
0 Reserved [RFC 8685]
1 2-byte AS number [RFC 8685]
2 4-byte AS number [RFC 8685]
3 4-byte OSPF area ID [RFC 8685]
4 Variable-length IS-IS area ID [RFC 8685]
5-255 Unassigned

H-PCE-FLAG TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8685][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-29 Unassigned
30 D (Disallow Domain Re-entry bit) [RFC 8685]
31 S (Domain Sequence bit) [RFC 8685]

ASSOCIATION Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8697][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-14 Unassigned
15 R (Removal) [RFC 8697]

ASSOCIATION Type Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8697][RFC 9756]
Available Formats

CSV
Type Name Reference
0 Reserved [RFC 8697]
1 Path Protection Association [RFC 8745]
2 Disjoint Association [RFC 8800]
3 Policy Association [RFC 9005]
4 Single-Sided Bidirectional LSP Association [RFC 9059]
5 Double-Sided Bidirectional LSP Association [RFC 9059]
6 SR Policy Association [RFC 9862]
7 VN Association [RFC 9358]
8 Bidirectional SR LSP Association [RFC-ietf-pce-sr-bidir-path-25]
9 P2MP SR Policy Association (TEMPORARY - registered 2024-08-27, extension registered 2026-08-06, expires 2027-08-27) [draft-ietf-pce-sr-p2mp-policy-11]
10-65535 Unassigned

AUTO-BANDWIDTH-CAPABILITY TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8733][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-31 Unassigned

AUTO-BANDWIDTH-ATTRIBUTES Sub-TLV Types

Reference
[RFC 8733]
Available Formats

CSV
Range Registration Procedures
0-65503 IETF Review
65504-65535 Experimental Use
Type Name Reference
0 Reserved [RFC 8733]
1 Sample-Interval [RFC 8733]
2 Adjustment-Interval [RFC 8733]
3 Down-Adjustment-Interval [RFC 8733]
4 Adjustment-Threshold [RFC 8733]
5 Adjustment-Threshold-Percentage [RFC 8733]
6 Down-Adjustment-Threshold [RFC 8733]
7 Down-Adjustment-Threshold-Percentage [RFC 8733]
8 Minimum-Bandwidth [RFC 8733]
9 Maximum-Bandwidth [RFC 8733]
10 Overflow-Threshold [RFC 8733]
11 Overflow-Threshold-Percentage [RFC 8733]
12 Underflow-Threshold [RFC 8733]
13 Underflow-Threshold-Percentage [RFC 8733]
14-65503 Unassigned
65504-65535 Experimental Use [RFC 8733]

Path Protection Association Group TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8745][RFC 9756]
Available Formats

CSV
Bit Name Reference
31 P - PROTECTION-LSP [RFC 8745]
30 S - SECONDARY-LSP [RFC 8745]
6-29 Unassigned
0-5 Protection Type Flags [RFC 8745]

Generalized Endpoint Types

Reference
[RFC 8779][RFC 9756]
Available Formats

CSV
Range Registration Procedures
0-244 IETF Review
245-255 Experimental Use
Value Type Reference
0 Point-to-Point [RFC 8779]
1 Point-to-Multipoint with leaf type 1 [RFC 8779]
2 Point-to-Multipoint with leaf type 2 [RFC 8779]
3 Point-to-Multipoint with leaf type 3 [RFC 8779]
4 Point-to-Multipoint with leaf type 4 [RFC 8779]
5 Point-to-Multipoint with leaf type 5 (TEMPORARY - registered 2024-08-27, extension registered 2026-08-06, expires 2027-08-27) [draft-ietf-pce-sr-p2mp-policy-11]
6-244 Unassigned
245-255 Experimental Use [RFC 8779]

GMPLS-CAPABILITY TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8779][RFC 9756]
Available Formats

CSV
Bit Capability Description Reference
31 LSP-REPORT-CAPABILITY (R) [RFC 9504]
30 LSP-UPDATE-CAPABILITY (U) [RFC 9504]
29 LSP-INSTANTIATION-CAPABILITY (I) [RFC 9504]
0-28 Unassigned

DISJOINTNESS-CONFIGURATION TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8800][RFC 9756]
Available Formats

CSV
Bit Name Reference
31 L - Link Diverse [RFC 8800]
30 N - Node Diverse [RFC 8800]
29 S - SRLG Diverse [RFC 8800]
28 P - Shortest Path [RFC 8800]
27 T - Strict Disjointness [RFC 8800]
0-26 Unassigned

SCHED-PD-LSP-ATTRIBUTE TLV Opt Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8934][RFC 9756]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC 8934]
1 REPEAT-EVERY-MONTH [RFC 8934]
2 REPEAT-EVERY-YEAR [RFC 8934]
3 REPEAT-EVERY-REPEAT-TIME-LENGTH [RFC 8934]
4-14 Unassigned
15 Reserved [RFC 8934]

Schedule TLVs Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 8934][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-3 Unassigned
4 Relative Time (R-bit) [RFC 8934]
5 PCC Responsible (C-bit) [RFC 8934]
6 LSP Activated (A-bit) [RFC 8934]
7 Grace Period Included (G-bit) [RFC 8934]

FLOWSPEC Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9168][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-5 Unassigned
6 LPM (L bit) [RFC 9168]
7 Remove (R bit) [RFC 9168]

PCEP Flow Specification TLV Type Indicators

Reference
[RFC 9168]
Available Formats

CSV
Range Registration Procedures Note
0-255 Reserved Must not be allocated. Usage mirrors the BGP Flowspec registry.
256-64506 Specification Required
64507-65531 First Come First Served
65532-65535 Experimental Use
Value Meaning Reference
0-255 Reserved. Must not be allocated. Usage mirrors the BGP FlowSpec registry [draft-ietf-idr-rfc5575bis-27] and [draft-ietf-idr-flow-spec-v6-19] [RFC 9168]
256 Route Distinguisher [RFC 9168]
257 IPv4 Multicast [RFC 9168]
258 IPv6 Multicast [RFC 9168]
259-65531 Unassigned
65532-65535 Experimental Use [RFC 9168]

Bidirectional LSP Association Group TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9059][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-29 Unassigned
30 C - Co-routed Path [RFC 9059]
31 R - Reverse LSP [RFC 9059]

PCECC-CAPABILITY sub-TLV

Registration Procedure(s)
IETF Review
Reference
[RFC 9050][RFC 9756]
Available Formats

CSV
Bit Name Reference
0-29 Unassigned
30 Native IP [RFC 9757]
31 Label [RFC 9050]

CCI Object Flag Field for MPLS Label

Registration Procedure(s)
IETF Review
Reference
[RFC 9050][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-13 Unassigned
14 C Bit - PCC allocation [RFC 9050]
15 O Bit - Specifies label is out-label [RFC 9050]

TE-PATH-BINDING TLV BT Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9604][RFC 9756]
Available Formats

CSV
Value Description Reference
0 MPLS Label [RFC 9604]
1 MPLS Label Stack Entry [RFC 9604]
2 SRv6 SID [RFC 9604]
3 SRv6 SID with Behavior and Structure [RFC 9604]
4-255 Unassigned

TE-PATH-BINDING TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9604][RFC 9756]
Available Formats

CSV
Bit Description Reference
0 R (Removal) [RFC 9604]
1 Deprecated (Specified-BSID-only) [RFC 9862]
2-7 Unassigned

LSP-EXTENDED-FLAG TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9357][RFC 9756]
Available Formats

CSV
Bit Capability Description Reference
0 GMPLS LSP (G) [RFC 9504]
1 Bidirectional Co-routed LSP (B) [RFC 9504]
2-3 Routing Granularity (RG) [RFC 9504]
4 Strict-Path Flag (O) [RFC-ietf-pce-circuit-style-pcep-extensions-16]
5-31 Unassigned

LSP Exclusion Subobject Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9504][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-7 Unassigned

PCEP SRv6-ERO NAI Types

Registration Procedure(s)
IETF Review
Reference
[RFC 9603]
Available Formats

CSV
Value Description Reference
0 NAI is absent. [RFC 9603]
1 Unassigned
2 NAI is an IPv6 node ID. [RFC 9603]
3 Unassigned
4 NAI is an IPv6 adjacency with global IPv6 addresses. [RFC 9603]
5 Unassigned
6 NAI is an IPv6 adjacency with link-local IPv6 addresses. [RFC 9603]
7-15 Unassigned

SRv6-ERO Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9603][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-6 Unassigned
7 SR-Algorithm Flag (A) [RFC 9933]
8 SID Verification (V) [RFC 9603]
9 SID Structure is present (T) [RFC 9603]
10 NAI is absent (F) [RFC 9603]
11 SID is absent (S) [RFC 9603]

SRv6 Capability Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9603][RFC 9756]
Available Formats

CSV
Bit Description Reference
0-12 Unassigned
13 SR-Algorithm Capability [RFC 9933]
14 Node or Adjacency Identifier (NAI) is supported (N) [RFC 9603]
15 Unassigned

CCI Object Flag Field for Native IP

Registration Procedure(s)
IETF Review
Reference
[RFC 9757]
Available Formats

CSV
Bit Description Reference
0-15 Unassigned

BPI Object Status Code Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9757]
Available Formats

CSV
Value Meaning Reference
0 Reserved [RFC 9757]
1 BGP Session Established [RFC 9757]
2 BGP Session Establishment In Progress [RFC 9757]
3 BGP Session Down [RFC 9757]
4-255 Unassigned

BPI Object Error Code Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9757]
Available Formats

CSV
Value Meaning Reference
0 Reserved [RFC 9757]
1 ASes do not match - BGP Session Failure [RFC 9757]
2 Peer IP can't be reached - BGP Session Failure [RFC 9757]
3-255 Unassigned

BPI Object Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9757]
Available Formats

CSV
Bit Meaning Reference
0-6 Unassigned
7 T (IP-in-IP) bit [RFC 9757]

SR Policy Invalidation Operational Flags

Registration Procedure(s)
IETF Review
Reference
[RFC 9862]
Available Formats

CSV
Bit Description Reference
0-6 Unassigned
7 D: Dropping - the LSP is actively dropping traffic as a result of Drop-Upon-Invalid behavior being activated. [RFC 9862]

SR Policy Invalidation Configuration Flags

Registration Procedure(s)
IETF Review
Reference
[RFC 9862]
Available Formats

CSV
Bit Description Reference
0-6 Unassigned
7 D: Drop enabled - the Candidate Path has Drop-Upon-Invalid feature enabled. [RFC 9862]

SR Policy Capability TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC 9862]
Available Formats

CSV
Bit Description Reference
0-26 Unassigned
27 Stateless Operation (L-flag) [RFC 9862]
28 Unassigned
29 Invalidation (I-flag) [RFC 9862]
30 Explicit NULL Label Policy (E-flag) [RFC 9862]
31 Computation Priority (P-flag) [RFC 9862]

PATH-MODIFICATION TLV Flag Field

Registration Procedure(s)
IETF Review
Reference
[RFC-ietf-pce-circuit-style-pcep-extensions-16]
Available Formats

CSV
Bit Description Reference
0-13 Unassigned
14 Permanent (P) [RFC-ietf-pce-circuit-style-pcep-extensions-16]
15 Force (F) [RFC-ietf-pce-circuit-style-pcep-extensions-16]

Flags in MULTIPATH-CAP TLV

Registration Procedure(s)
IETF Review
Reference
[RFC-ietf-pce-multipath-29]
Available Formats

CSV
Bit Description Reference
0-10 Unassigned
11 C-flag: Composite Candidate Path support [RFC-ietf-pce-multipath-29]
12 F-flag: MULTIPATH-FORWARD-CLASS TLV support [RFC-ietf-pce-multipath-29]
13 O-flag: MULTIPATH-OPPDIR-PATH TLV support [RFC-ietf-pce-multipath-29]
14 Unassigned
15 W-flag: MULTIPATH-WEIGHT TLV support [RFC-ietf-pce-multipath-29]

Flags in PATH-ATTRIB Object

Registration Procedure(s)
IETF Review
Reference
[RFC-ietf-pce-multipath-29]
Available Formats

CSV
Bit Description Reference
0-27 Unassigned
28 R-flag: Reverse path [RFC-ietf-pce-multipath-29]
29-31 O-flag: Operational state [RFC-ietf-pce-multipath-29]

Flags in MULTIPATH-OPPDIR-PATH TLV

Registration Procedure(s)
IETF Review
Reference
[RFC-ietf-pce-multipath-29]
Available Formats

CSV
Bit Description Reference
0-13 Unassigned
14 L-flag: Link co-routed [RFC-ietf-pce-multipath-29]
15 N-flag: Node co-routed [RFC-ietf-pce-multipath-29]

Flags in MULTIPATH-FORWARD-CLASS TLV

Registration Procedure(s)
IETF Review
Reference
[RFC-ietf-pce-multipath-29]
Available Formats

CSV
Bit Description Reference
0 T-flag: MPLS TC type [RFC-ietf-pce-multipath-29]
1-28 Unassigned
29-31 FC: Forwarding class [RFC-ietf-pce-multipath-29]