Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters

Created: 2006-01-12
Last Updated: 2024-11-05
Available Formats: XML
HTML
Plain text

Registries included below

Message Types
Reply Modes
Return Codes
TLVs
- Sub-TLVs for TLV Types 1, 16, and 21
- Sub-TLVs for TLV Type 6
- Sub-TLVs for TLV Type 9
- Sub-TLVs for TLV Type 11
- Sub-TLVs for TLV Type 20
- Sub-TLVs for TLV Type 23
- Sub-TLVs for TLV Type 27
Measurement Timestamp Type
Loss/Delay Measurement Control Code: Query Codes
Loss/Delay Measurement Control Code: Response Codes
MPLS Loss/Delay Measurement TLV Object
Global Flags
Downstream Detailed Mapping Address Type Registry
Next Hop Address Type Registry
Reply Path Return Codes
DS Flags
Multipath Types
Pad Types
Interface and Label Stack and Detailed Interface and Label Stack Address Types
Proxy Flags
MPLS OAM Function Flags
Protocol in the Segment ID Sub-TLV
Adjacency Type in the IGP-Adjacency Segment ID
Protocol in Label Stack Sub-TLV of Downstream Detailed Mapping TLV
LSR Capability Flags
Interface Index Flags
Segment ID Sub-TLV Flags

Message Types

Reference: [RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-191	Standards Action
192-247	RFC Required
248-251	Experimental Use	Reserved, not to be assigned
252-255	Private Use	Reserved, not to be assigned

Value	Meaning	Reference
0	Reserved	[RFC9041]
1	MPLS Echo Request	[RFC8029]
2	MPLS Echo Reply	[RFC8029]
3	MPLS Proxy Ping Request	[RFC7555]
4	MPLS Proxy Ping Reply	[RFC7555]
5	MPLS Relayed Echo Reply	[RFC7743]
6-247	Unassigned
248-251	Reserved for Experimental Use	[RFC9041]
252-255	Reserved for Private Use	[RFC8029]

Reply Modes

Reference: [RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-191	Standards Action
192-247	RFC Required
248-251	Experimental Use	Reserved, not to be assigned
252-255	Private Use	Reserved, not to be assigned

Value	Meaning	Reference
0	Reserved	[RFC9041]
1	Do not reply	[RFC8029]
2	Reply via an IPv4/IPv6 UDP packet	[RFC8029]
3	Reply via an IPv4/IPv6 UDP packet with Router Alert (DEPRECATED)	[RFC8029][RFC9570]
4	Reply via application-level control channel	[RFC8029]
5	Reply via Specified Path	[RFC7110]
6-247	Unassigned
248-251	Reserved for Experimental Use	[RFC9041]
252-255	Reserved for Private Use	[RFC8029]

Return Codes

Reference: [RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-191	Standards Action
192-247	RFC Required
248-251	Experimental Use	Reserved, not to be assigned
252-255	Private Use	Reserved, not to be assigned

Value	Meaning	Reference
0	No Return Code	[RFC8029]
1	Malformed echo request received	[RFC8029]
2	One or more of the TLVs was not understood	[RFC8029]
3	Replying router is an egress for the FEC at stack-depth <RSC>	[RFC8029]
4	Replying router has no mapping for the FEC at stack-depth <RSC>	[RFC8029]
5	Downstream Mapping Mismatch (See [1])	[RFC8029]
6	Upstream Interface Index Unknown (See [1])	[RFC8029]
7	Reserved	[RFC8029]
8	Label switched at stack-depth <RSC>	[RFC8029]
9	Label switched but no MPLS forwarding at stack-depth <RSC>	[RFC8029]
10	Mapping for this FEC is not the given label at stack-depth <RSC>	[RFC8029]
11	No label entry at stack-depth <RSC>	[RFC8029]
12	Protocol not associated with interface at FEC stack-depth <RSC>	[RFC8029]
13	Premature termination of ping due to label stack shrinking to a single label	[RFC8029]
14	See DDMAP TLV for meaning of Return Code and Return Subcode (See [2])	[RFC8029]
15	Label switched with FEC change	[RFC8029]
16	Proxy Ping not authorized	[RFC7555]
17	Proxy Ping parameters need to be modified	[RFC7555]
18	MPLS Echo Request could not be sent	[RFC7555]
19	Replying router has FEC mapping for topmost FEC	[RFC7555]
20	One or more TLVs not returned due to MTU size	[RFC7743]
21	OAM Problem/Unsupported BFD Version	[RFC7759]
22	OAM Problem/Unsupported BFD Encapsulation format	[RFC7759]
23	OAM Problem/Unsupported BFD Authentication Type	[RFC7759]
24	OAM Problem/Mismatch of BFD Authentication Key ID	[RFC7759]
25	OAM Problem/Unsupported Timestamp Format	[RFC7759]
26	OAM Problem/Unsupported Delay Mode	[RFC7759]
27	OAM Problem/Unsupported Loss Mode	[RFC7759]
28	OAM Problem/Delay variation unsupported	[RFC7759]
29	OAM Problem/Dyadic mode unsupported	[RFC7759]
30	OAM Problem/Loopback mode unsupported	[RFC7759]
31	OAM Problem/Combined mode unsupported	[RFC7759]
32	OAM Problem/Fault management signaling unsupported	[RFC7759]
33	OAM Problem/Unable to create fault management association	[RFC7759]
34	OAM Problem/PM Configuration Error	[RFC7759]
35	Mapping for this FEC is not associated with the incoming interface	[RFC8287, Section 7.4]
36	Replying router is an egress for the address in the Egress TLV for the FEC at stack depth <RSC>	[RFC-ietf-mpls-egress-tlv-for-nil-fec-15]
37	Replying router is egress for the FEC at the stack depth. In addition, the BUM packets are dropped on the ES corresponding to the ESI received in EVPN Ethernet Auto-Discovery sub-TLV because of the Split Horizon Group filtering.	[RFC9489]
38	Replying router is egress for the FEC at the stack depth. In addition, the BUM packets are forwarded because there is no ES corresponding to the ESI received in EVPN Ethernet Auto-Discovery sub-TLV.	[RFC9489]
39-191	Unassigned
192	Inappropriate Target FEC Stack sub-TLV present	[RFC9612]
193	Failed to establish the BFD session. The specified reverse path was not found.	[RFC9612]
194-247	Unassigned
248-251	Reserved for Experimental Use	[RFC9041]
252-255	Reserved for Private Use	[RFC8029]

TLVs

Reference: [RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for TLVs that can be silently dropped if not recognized.

Type	TLV Name	Reference	Sub-TLV Registry
0	Reserved	[RFC9041]
1	Target FEC Stack	[RFC8029]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-1-16-21]
2	Downstream Mapping (DEPRECATED)	[RFC8029]	No Sub-TLVs
3	Pad	[RFC8029]	No Sub-TLVs
4	LSR Capability	[RFC8611]	No Sub-TLVs
5	Vendor Enterprise Number	[RFC8029]	No Sub-TLVs
6	Detailed Interface and Label Stack	[RFC8611]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-6]
7	Interface and Label Stack	[RFC8029]	No Sub-TLVs
8	Unassigned
9	Errored TLVs	[RFC8029]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-9]
10	Reply TOS Byte	[RFC8029]	No Sub-TLVs
11	P2MP Responder Identifier	[RFC6425]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-11]
12	Echo Jitter	[RFC6425]	No Sub-TLVs
13	Source ID	[RFC6426]	No Sub-TLVs
14	Destination ID	[RFC6426]	No Sub-TLVs
15	BFD Discriminator	[RFC5884]	No Sub-TLVs
16	Reverse-path Target FEC Stack	[RFC6426]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-1-16-21]
17-19	Unassigned
20	Downstream Detailed Mapping	[RFC8029]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-20]
21	Reply Path	[RFC7110]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-1-16-21]
22	Reply TC	[RFC7110]	No Sub-TLVs
23	Proxy Echo Parameters	[RFC7555]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-23]
24	Reply-to Address	[RFC7555]	No Sub-TLVs
25	Upstream Neighbor Address	[RFC7555]	No Sub-TLVs
26	Downstream Neighbor Address	[RFC7555]	No Sub-TLVs
27	MPLS OAM Functions	[RFC7759]	[https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-27]
28	EGRESS TLV (DEPRECATED)	[RFC-ietf-mpls-egress-tlv-for-nil-fec-15]	No Sub-TLVs
29-16383	Unassigned
16384	BFD Reverse Path	[RFC9612]	Only non-multicast sub-TLVs (already defined or to be defined in the future) in the "Sub-TLVs for TLV Types 1, 16, and 21" registry at [https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xml#sub-tlv-1-16-21] are permitted to be used in this field. Other sub-TLVs MUST NOT be used.
16385-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	Unassigned
32768	Relay Node Address Stack TLV	[RFC7743]	No Sub-TLVs
32769	Time To Live	[RFC7394]	No Sub-TLVs
32770	Reply Mode Order TLV	[RFC7737]	No Sub-TLVs
32771	Egress TLV	[RFC-ietf-mpls-egress-tlv-for-nil-fec-15]	No Sub-TLVs
32772-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Sub-TLVs for TLV Types 1, 16, and 21

Reference: [RFC6425][RFC6426][RFC7110][RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for sub-TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for sub-TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for sub-TLVs that can be silently dropped if not recognized.

Sub-Type	Sub-TLV Name	Reference	Comment
0	Reserved	[RFC9041]
1	LDP IPv4 prefix	[RFC8029]
2	LDP IPv6 prefix	[RFC8029]
3	RSVP IPv4 LSP	[RFC8029]
4	RSVP IPv6 LSP	[RFC8029]
5	Unassigned
6	VPN IPv4 prefix	[RFC8029]
7	VPN IPv6 prefix	[RFC8029]
8	L2 VPN endpoint	[RFC8029]
9	"FEC 128" Pseudowire - IPv4	[RFC8029]	DEPRECATED
10	"FEC 128" Pseudowire - IPv4	[RFC8029]
11	"FEC 129" Pseudowire - IPv4	[RFC8029]
12	BGP labeled IPv4 prefix	[RFC8029]
13	BGP labeled IPv6 prefix	[RFC8029]
14	Generic IPv4 prefix	[RFC8029]
15	Generic IPv6 prefix	[RFC8029]
16	Nil FEC	[RFC8029]
17	RSVP P2MP IPv4 Session	[RFC6425]
18	RSVP P2MP IPv6 Session	[RFC6425]
19	Multicast P2MP LDP FEC Stack	[RFC6425]
20	Multicast MP2MP LDP FEC Stack	[RFC6425]
21	Unassigned
22	Static LSP	[RFC6426]
23	Static Pseudowire	[RFC6426]
24	"FEC 128" Pseudowire - IPv6	[RFC8029]
25	"FEC 129" Pseudowire - IPv6	[RFC8029]
26	IPv4 RSVP Tunnel	[RFC7110]
27	IPv6 RSVP Tunnel	[RFC7110]
28	Static Tunnel	[RFC7110]
29	HSMP-upstream LDP FEC Stack	[RFC7140]
30	HSMP-downstream LDP FEC Stack	[RFC7140]
31	MT LDP IPv4 prefix	[RFC7307]
32	MT LDP IPv6 prefix	[RFC7307]
33	Entropy label FEC	[RFC8012]
34	IPv4 IGP-Prefix Segment ID	[RFC8287, Section 5.1][RFC8690]
35	IPv6 IGP-Prefix Segment ID	[RFC8287, Section 5.2][RFC8690]
36	IGP-Adjacency Segment ID	[RFC8287, Section 5.3][RFC8690]
37	P2MP Pseudowire sub-TLV	[RFC8339]
38	PeerAdj SID	[RFC-ietf-mpls-sr-epe-oam-19]
39	PeerNode SID	[RFC-ietf-mpls-sr-epe-oam-19]
40	PeerSet SID	[RFC-ietf-mpls-sr-epe-oam-19]
41	P2MP Policy MPLS Candidate Path (TEMPORARY - registered 2023-04-27, extension registered 2024-03-27, expires 2025-04-27)	[draft-ietf-pim-p2mp-policy-ping-04]
42	EVPN MAC/IP	[RFC9489]
43	EVPN Inclusive Multicast	[RFC9489]
44	EVPN Ethernet Auto-Discovery	[RFC9489]
45	EVPN IP Prefix	[RFC9489]
46	SID only in the form of MPLS label	[RFC-ietf-mpls-spring-inter-domain-oam-20, Section 4.1]
47	IPv4 Node Address with optional SID for SR-MPLS	[RFC-ietf-mpls-spring-inter-domain-oam-20, Section 4.2]
48	IPv6 Node Address with optional SID for SR-MPLS	[RFC-ietf-mpls-spring-inter-domain-oam-20, Section 4.3]
49-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744	IPv4 BGP Classful Transport	[draft-ietf-idr-bgp-ct-30]
31745	IPv6 BGP Classful Transport	[draft-ietf-idr-bgp-ct-30]
31746-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Sub-TLVs for TLV Type 6

Reference: [RFC8611][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for sub-TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for sub-TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for sub-TLVs that can be silently dropped if not recognized.

Sub-Type	Sub-TLV Name	Reference	Comment
0	Reserved	[RFC8611][RFC9041]
1	Incoming Label Stack	[RFC8611]
2	Incoming Interface Index	[RFC8611]
3-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Sub-TLVs for TLV Type 9

Registration Procedure(s)

None

Reference

[RFC8029]

Available Formats

CSV

Sub-Type	Sub-TLV Name	Reference	Comment
Any value	TLV Not Understood	[RFC8029]	The entire errored TLV is returned

Sub-TLVs for TLV Type 11

Reference: [RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for sub-TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for sub-TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for sub-TLVs that can be silently dropped if not recognized.

Sub-Type	Sub-TLV Name	Reference	Comment
0	Reserved	[RFC9041]
1	IPv4 Egress Address P2MP Responder	[RFC6425]
2	IPv6 Egress Address P2MP Responder	[RFC6425]
3	IPv4 Node Address P2MP Responder	[RFC6425]
4	IPv6 Node Address P2MP Responder	[RFC6425]
5-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Sub-TLVs for TLV Type 20

Reference: [RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for sub-TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for sub-TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for sub-TLVs that can be silently dropped if not recognized.

Sub-Type	Sub-TLV Name	Reference	Comment
0	Reserved	[RFC9041]
1	Multipath data	[RFC8029]
2	Label stack	[RFC8029]
3	FEC stack change	[RFC8029]
4	Local Interface Index	[RFC8611]
5	Remote Interface Index	[RFC8611]
6-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Sub-TLVs for TLV Type 23

Reference: [RFC7555][RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for sub-TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for sub-TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for sub-TLVs that can be silently dropped if not recognized.

Sub-Type	Sub-TLV Name	Reference	Comment
0	Reserved	[RFC7555]
1	Next Hop	[RFC7555]
2-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Sub-TLVs for TLV Type 27

Reference: [RFC7759][RFC8029][RFC9041]
Available Formats: CSV

Range	Registration Procedures	Note
0-16383	Standards Action	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
16384-31739	RFC Required	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31740-31743	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-32767	First Come First Served	This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
32768-49161	Standards Action	This range is for sub-TLVs that can be silently dropped if not recognized.
49162-64507	RFC Required	This range is for sub-TLVs that can be silently dropped if not recognized.
64508-64511	Experimental Use	Reserved, not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	First Come First Served	This range is for sub-TLVs that can be silently dropped if not recognized.

Sub-Type	Sub-TLV Name	Reference	Comment
0	Reserved	[RFC7759]
1-99	Unassigned
100	BFD Configuration	[RFC7759]
101	BFD Local Discriminator	[RFC7759]
102	BFD Negotiation Timer Parameters	[RFC7759]
103	BFD Authentication	[RFC7759]
104	Traffic Class	[RFC7759]
105-199	Unassigned
200	Performance Monitoring	[RFC7759]
201	PM Loss Measurement	[RFC7759]
202	PM Delay Measurement	[RFC7759]
203-299	Unassigned
300	Fault Management Signal	[RFC7759]
301-399	Unassigned
400	Source MEP-ID	[RFC7759]
401-31739	Unassigned
31740-31743	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [RFC9041, Section 3.1]
31744-64507	Unassigned
64508-64511	Reserved for Experimental Use	[RFC9041]	Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.
64512-65535	Unassigned

Measurement Timestamp Type

Reference

[RFC6374][RFC7214]

Note

Moved to [https://www.iana.org/assignments/g-ach-parameters]  
per [RFC7214].

Loss/Delay Measurement Control Code: Query Codes

Reference

[RFC6374][RFC7214]

Note

Moved to [https://www.iana.org/assignments/g-ach-parameters]  
per [RFC7214].

Loss/Delay Measurement Control Code: Response Codes

Reference

[RFC6374][RFC7214]

Note

Moved to [https://www.iana.org/assignments/g-ach-parameters]  
per [RFC7214].

MPLS Loss/Delay Measurement TLV Object

Reference

[RFC6374][RFC7214]

Note

Moved to [https://www.iana.org/assignments/g-ach-parameters]  
per [RFC7214].

Global Flags

Registration Procedure(s)

Standards Action

Reference

[RFC6425]

Available Formats

CSV

Bit number	Name	Reference
15	V Flag	[RFC8029]
14	T Flag	[RFC6425]
13	Validate Reverse Path	[RFC6426][RFC Errata 4012]
12-0	Unassigned	[RFC8029]

Downstream Detailed Mapping Address Type Registry

Registration Procedure(s)

Standards Action

Reference

[RFC6426][RFC7555][RFC8029]

Note

When a code point is assigned that is not also assigned in the
Next Hop Address Type Registry, the code point there must be
marked "Reserved".

Available Formats

CSV

Type #	Address Type	K Octets	Reference
0	Unassigned
1	IPv4 Numbered	16	[RFC8029]
2	IPv4 Unnumbered	16	[RFC8029]
3	IPv6 Numbered	40	[RFC8029]
4	IPv6 Unnumbered	28	[RFC8029]
5	Non IP	12	[RFC6426]
6	Reserved		[RFC7555]
7	Reserved		[RFC7555]
8-255	Unassigned

Next Hop Address Type Registry

Registration Procedure(s)

Standards Action

Reference

[RFC7555]

Note

When a code point is assigned that is not also assigned in the
Downstream Mapping Address Type Registry, the code point there must be
marked "Reserved".

Available Formats

CSV

Type	Type of Next Hop	Address Length	IF Length	Reference
0	Unassigned
1	IPv4 Numbered	4	4	[RFC8029]
2	IPv4 Unnumbered	4	4	[RFC8029]
3	IPv6 Numbered	16	16	[RFC8029]
4	IPv6 Unnumbered	16	4	[RFC8029]
5	Reserved			[RFC6426][RFC7555]
6	IPv4 Protocol Adj	4	0	[RFC7555]
7	IPv6 Protocol Adj	16	0	[RFC7555]
8-255	Unassigned

Reply Path Return Codes

Reference: [RFC7110]
Available Formats: CSV

Range	Registration Procedures
0x0000-0xFFFB	Standards Action
0xFFFC-0xFFFF	Experimental Use

Value	Meaning	Reference
0x0000	No return code	[RFC7110]
0x0001	Malformed Reply Path TLV was received	[RFC7110]
0x0002	One or more of the sub-TLVs in the Reply Path TLV were not understood	[RFC7110]
0x0003	The echo reply was sent successfully using the specified Reply Path	[RFC7110]
0x0004	The specified Reply Path was not found, the echo reply was sent via other LSP	[RFC7110]
0x0005	The specified Reply Path was not found, the echo reply was sent via pure IP forwarding (non-MPLS) path	[RFC7110]
0x0006	Use Reply Path TLV from this echo reply for building next echo request.	[RFC-ietf-mpls-spring-inter-domain-oam-20]
0x0007	Local policy does not allow dynamic return Path building.	[RFC-ietf-mpls-spring-inter-domain-oam-20]
0x0008-0xFFFB	Unassigned	[RFC7110]
0xFFFC-0xFFFF	Reserved for Experimental Use	[RFC7110]

DS Flags

Registration Procedure(s)

Standards Action

Reference

[RFC8029]

Available Formats

CSV

Bit Number	Name	Reference
7	N: Treat as a Non-IP Packet	[RFC8029]
6	I: Interface and Label Stack Object Request	[RFC8029]
5	E: ELI/EL push indicator	[RFC8012]
4	L: Label-based load balance indicator	[RFC8012]
3	G: LAG Description Indicator	[RFC8611]
2-0	Unassigned

Multipath Types

Registration Procedure(s)

Standards Action

Reference

[RFC8029]

Available Formats

CSV

Range	Registration Procedures
0-250	Standards Action
251-254	Experimental Use

Value	Meaning	Reference
0	no multipath	[RFC8029]
1	Unassigned
2	IP address	[RFC8029]
3	Unassigned
4	IP address range	[RFC8029]
5-7	Unassigned
8	Bit-masked IP address set	[RFC8029]
9	Bit-masked label set	[RFC8029]
10	IP and label set	[RFC8012]
11-250	Unassigned
251-254	Reserved for Experimental Use	[RFC8029]
255	Reserved	[RFC8029]

Pad Types

Reference: [RFC8029]
Available Formats: CSV

Range	Registration Procedures
1-250	Standards Action
251-254	Experimental Use

Value	Meaning	Reference
0	Reserved	[RFC8029]
1	Drop Pad TLV from reply	[RFC8029]
2	Copy Pad TLV to reply	[RFC8029]
3-250	Unassigned
251-254	Reserved for Experimental Use	[RFC8029]
255	Reserved	[RFC8029]

Interface and Label Stack and Detailed Interface and Label Stack Address Types

Reference: [RFC8029][RFC8611]
Available Formats: CSV

Range	Registration Procedures
1-250	Standards Action
251-254	Experimental Use

Value	Meaning	Reference
0	Reserved	[RFC8029]
1	IPv4 Numbered	[RFC8029]
2	IPv4 Unnumbered	[RFC8029]
3	IPv6 Numbered	[RFC8029]
4	IPv6 Unnumbered	[RFC8029]
5-250	Unassigned
251-254	Reserved for Experimental Use	[RFC8029]
255	Reserved	[RFC8029]

Proxy Flags

Registration Procedure(s)

Standards Action

Reference

[RFC7555]

Available Formats

CSV

Bit Number	Name	Reference
0	Request for FEC Neighbor Address info	[RFC7555]
1	Request for Downstream Mapping	[RFC7555]
2	Request for Downstream Detailed Mapping	[RFC7555]
3	Explicit DSCP Request	[RFC7555]
4-15	Unassigned

MPLS OAM Function Flags

Registration Procedure(s)

Standards Action

Reference

[RFC7759]

Available Formats

CSV

Bit Position	MPLS OAM Function Flag	Description	Reference
0	C	Continuity Check (CC)	[RFC7759]
1	V	Connectivity Verification (CV)	[RFC7759]
2	F	Fault Management Signal (FMS)	[RFC7759]
3	L	Performance Monitoring/Loss (PM/Loss)	[RFC7759]
4	D	Performance Monitoring/Delay (PM/Delay)	[RFC7759]
5	T	Throughput Measurement	[RFC7759]
6-30		Unassigned (Must be zero)
31		Reserved	[RFC7759]

Protocol in the Segment ID Sub-TLV

Reference: [RFC8287]
Available Formats: CSV

Range	Registration Procedures
0-250	Standards Action
251-254	Experimental Use

Value	Meaning	Reference	Notes
0	Any IGP Protocol	[RFC8287]
1	OSPF	[RFC8287]	To be used for OSPFv2 only.
2	ISIS	[RFC8287]
3	OSPFv3	[RFC9214]
4-250	Unassigned
251-254	Reserved for Experimental Use	[RFC8287]
255	Reserved	[RFC8287]

Adjacency Type in the IGP-Adjacency Segment ID

Reference: [RFC8287]
Available Formats: CSV

Range	Registration Procedures
0-250	Standards Action
251-254	Experimental Use

Value	Meaning	Reference
0	Unnumbered interface Adjacency	[RFC8287]
1	Parallel Adjacency	[RFC8287]
2-3	Unassigned
4	IPv4, non-parallel Adjacency	[RFC8287]
5	Unassigned
6	IPv4, non-parallel Adjacency	[RFC8287]
7-250	Unassigned
251-254	Reserved for Experimental Use	[RFC8287]
255	Reserved	[RFC8287]

Protocol in Label Stack Sub-TLV of Downstream Detailed Mapping TLV

Reference: [RFC8287]
Available Formats: CSV

Range	Registration Procedures
0-250	Standards Action
251-254	Experimental Use

Value	Meaning	Reference	Notes
0	Unknown	[RFC8029, Section 3.4.1.2]
1	Static	[RFC8029, Section 3.4.1.2]
2	BGP	[RFC8029, Section 3.4.1.2]
3	LDP	[RFC8029, Section 3.4.1.2]
4	RSVP-TE	[RFC8029, Section 3.4.1.2]
5	OSPF	[RFC8287, Section 6]	To be used for OSPFv2 only.
6	ISIS	[RFC8287, Section 6]
7	OSPFv3	[RFC9214]
8-250	Unassigned
251-254	Reserved for Experimental Use	[RFC8287]
255	Reserved	[RFC8287]

LSR Capability Flags

Registration Procedure(s)

Standards Action

Reference

[RFC8611]

Available Formats

CSV

Value	Meaning	Reference
31	D: Downstream LAG Info Accommodation	[RFC8611]
30	U: Upstream LAG Info Accommodation	[RFC8611]
0-29	Unassigned

Interface Index Flags

Registration Procedure(s)

Standards Action

Reference

[RFC8611]

Available Formats

CSV

Bit Number	Name	Reference
15	M: LAG Member Link Indicator	[RFC8611]
0-14	Unassigned

Segment ID Sub-TLV Flags

Registration Procedure(s)

Standards Action

Reference

[RFC-ietf-mpls-spring-inter-domain-oam-20]

Available Formats

CSV

Bit Number	Name	Reference
0	Unassigned
1	A Flag	[RFC-ietf-mpls-spring-inter-domain-oam-20, Section 4.4]
2-7	Unassigned

Footnotes

[1]

The Return Subcode (RSC) contains the point in the label stack where pro-
cessing was terminated. If the RSC is 0, no labels were processed.
Otherwise, the packet was label switched at depth RSC.

[2]

The Return Code is per "Downstream Detailed Mapping TLV" (Section 3.4). 
This Return Code MUST be used only in the message header and MUST be set 
only in the MPLS echo reply message. If the Return Code is set in the 
MPLS echo request message, then it MUST be ignored. When this Return 
Code is set, each Downstream Detailed Mapping TLV MUST have an 
appropriate Return Code and Return Subcode. This Return Code 
MUST be used when there are multiple downstreams for a given 
node (such as Point-to-Multipoint (P2MP)or ECMP),and the 
node needs to return a Return Code/Return Subcode for 
each downstream. This Return Code MAY be used even 
when there is only one downstream for a given node.