Internet Assigned Numbers Authority
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IS-IS TLV Codepoints
Created
2003-05-06
Last Updated
2025-09-30
Note
For IS-IS registries and value ranges maintained via the "Expert
Review" [RFC8126] registration procedure, guidance for IESG-designated
experts can be found in [RFC7370].
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
Plain text
Registries Included Below
??IS-IS Top-Level TLV Codepoints
??IS-IS Authentication Type Codes
??IS-IS Sub-TLVs for Reverse Metric TLV
??IS-IS Sub-TLVs for TLVs Advertising Neighbor Information
??IS-IS Neighbor Link-Attribute Bit Values
??IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability
??IS-IS Bit Values for Prefix Attribute Flags Sub-TLV
??IS-IS Group Address Type Codes for GADDR-TLV
??IS-IS Sub-TLVs for MT-Port-Cap-TLV
??IS-IS Sub-TLVs for MT-Capability TLV
??IS-IS Sub-TLVs for IS-IS Router CAPABILITY TLV
??IS-IS Sub-Sub-TLVs for SRv6 Capabilities Sub-TLV
??IS-IS SRv6 Capabilities Sub-TLV Flags
??IS-IS Application Identifiers for Generic Information TLV
??IS-IS Sub-Sub-TLVs for BIER Info Sub-TLV
??IS-IS Sub-TLVs for Segment Identifier/Label Binding TLVs
??IS-IS Sub-Sub-TLV Codepoints for Application-Specific Link Attributes
??IS-IS Sub-TLVs for Application-Specific SRLG TLV
??IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs
??IS-IS SRv6 Locator TLV Flags
??IS-IS SRv6 End SID Sub-TLV Flags
??IS-IS SRv6 Adjacency SID Sub-TLVs Flags
??IS-IS Sub-Sub-TLVs for Flexible Algorithm Definition Sub-TLV
??IS-IS Sub-Sub-TLVs for Flood Reflection Discovery Sub-TLV
??IS-IS Sub-TLVs for the Area Proxy TLV
??IS-IS Sub-TLVs for Flooding Parameters TLV
??IS-IS Bit Values for Flooding Parameters Flags Sub-TLV
IS-IS Top-Level TLV Codepoints
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
Top-level TLVs for the IS-IS protocol
Reference
[RFC3563][RFC6233][RFC7356][RFC8918][RFC-ietf-lsr-multi-tlv-19]
Note
IETF SHALL keep JTC1/SC6 informed of TLV codepoint values allocated,
and JTC1/SC6 SHALL refer allocation requests arising within JTC1
constituencies to the IANA registry process.
Note
Codepoints greater than 255 can only be used in PDUs designated to
support extended TLVs.
Available Formats
[IMG]
CSV
Value Name IIH LSP SNP Purge MP Status/Reference
0 Reserved
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
1 Area Addresses y y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
2 IIS Neighbors n y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
3 ES Neighbors n y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
4 Part. DIS n y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
5 Prefix Neighbors n y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
6 IIS Neighbors y n n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
7 Instance Identifier y y y y y [RFC8202]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
8 Padding y n n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
9 LSP Entries n n y n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
10 Authentication y y y y n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.][RFC6233]
11 ESN TLV y n y n n [RFC7602]
12 Opt. Checksum y n y n n [RFC3358]
13 Purge Originator Identification n n n y n [RFC6232] [RFC8918]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain
14 LSPBufferSize n y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol
for Providing the Connectionless-mode Network Service (ISO 8473)",
International Standard 10589: 2002, Second Edition, 2002.]
15 Router-Fingerprint y y n y n [RFC8196]
16 Reverse Metric y n n n n [RFC8500]
17 IS-IS Area Node IDs n y n n n [RFC9667]
18 IS-IS Flooding Path n y n n n [RFC9667]
19 IS-IS Flooding Request y n n n n [RFC9667]
20 Area Proxy n y n n y [RFC9666]
21 Flooding Parameters TLV y n y n y [RFC9681]
22 Extended IS reachability n y n n y [RFC5305]
23 IS Neighbor Attribute n y n n y [RFC5311]
24 IS Alias ID n y n n n [RFC5311]
25 L2 Bundle Member Attributes n y n n y [RFC8668]
26 Unassigned
27 SRv6 Locator n y n n y [RFC9352]
Zone ID (TEMPORARY - registered 2020-11-20,
28 extension registered 2024-11-18, expires n y n n n [draft-ietf-lsr-isis-ttz-08]
2025-11-20)
29-41 Unassigned
42 DECnet Phase IV y n n n n DEC (ancient)
43-65 Unassigned
66 Lucent Proprietary n y n n n
67-125 Unassigned
126 IPv4 Algorithm Prefix Reachability n y n n n [RFC9502, Section 6.1]
127 IPv6 Algorithm Prefix Reachability n y n n n [RFC9502, Section 6.2]
128 IP Int. Reach n y n n n [RFC1195][RFC5302]
129 Prot. Supported y y n n n [RFC1195]
130 IP Ext. Address n y n n n [RFC1195][RFC5302]
131 IDRPI n y y n n [RFC1195]
132 IP Intf. Address y y n n n [RFC1195]
133 Illegal n n n n n [RFC1195] (not used)
134 Traffic Engineering router ID n y n n n [RFC5305]
135 Extended IP reachability n y n n y [RFC5305]
136 Unassigned
137 Dynamic Name n y n y n [RFC5301] [RFC6233]
138 GMPLS-SRLG n y n n y [RFC5307]
139 IPv6 SRLG n y n n n [RFC6119]
140 IPv6 TE Router ID n y n n n [RFC6119]
141 Inter-AS Reachability Information n y n n y [RFC9346]
142 GADDR-TLV n y n n y [RFC7176]
143 MT-Port-Cap-TLV y n n n y [RFC6165]
144 MT-Capability TLV n y n n y [RFC6329]
145 TRILL Neighbor TLV y n n n n [RFC7176]
146 Unassigned
147 MAC-RI TLV n y n n y [RFC6165]
148 BFD-Enabled TLV y n n n y [RFC6213]
149 Segment Identifier / Label Binding n y n n y [RFC8667]
150 Multi-Topology Segment Identifier / Label n y n n y [RFC8667]
Binding
151-160 Unassigned
161 Flood Reflection y n n n n [RFC9377]
162-175 Unassigned
176 Nortel Proprietary n y n n n
177 Nortel Proprietary n y n n n
178-210 Unassigned
211 Restart TLV y n n n n [RFC8706]
212-221 Unassigned
222 MT-ISN n y n n y [RFC5120]
223 MT IS Neighbor Attribute n y n n y [RFC5311]
224-228 Unassigned
229 M-Topologies y y n n n [RFC5120]
230-231 Unassigned
232 IPv6 Intf. Addr. y y n n n [RFC5308]
233 IPv6 Global Interface Address TLV y n n n n [RFC6119]
234 Unassigned
235 MT IP. Reach n y n n y [RFC5120]
236 IPv6 IP. Reach n y n n y [RFC5308]
237 MT IPv6 IP. Reach n y n n y [RFC5120]
238 Application-Specific SRLG n y n n y [RFC9479]
239 Unassigned
240 P2P 3-Way Adj. State y n n n n [RFC5303]
241 Unassigned
242 IS-IS Router CAPABILITY TLV n y n n y [RFC7981]
243 Scope Flooding Support y n n n n [RFC7356]
244-250 Unassigned
251 Generic Information n y n n y [RFC6823]
252-65535 Unassigned
IS-IS Authentication Type Codes
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
Type Codes for Authentication TLV (10)
Reference
[RFC5304]
Available Formats
[IMG]
CSV
Value Authentication Type Code Reference
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange
0 Reserved Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode
Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange
1 Cleartext Password Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode
Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.]
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange
2 ISO 10589 Reserved Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode
Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.]
3 Cryptographic Authentication (CRYPTO_AUTH) [RFC5310]
4-53 Unassigned
54 HMAC-MD5 Authentication [RFC5304]
55-254 Unassigned
[ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange
255 Routing Domain private authentication method Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode
Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.]
IS-IS Sub-TLVs for Reverse Metric TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
Sub-TLVs for Reverse Metric TLV (16)
Reference
[RFC8500][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Type Description MP Reference
0 Reserved [RFC8500]
1-17 Unassigned
18 Traffic Engineering Metric n [RFC8500, Section 2]
19-255 Unassigned
IS-IS Sub-TLVs for TLVs Advertising Neighbor Information
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for TLVs advertising neighbor information.
The list of TLVs includes:
Extended IS reachability (22)
IS Neighbor Attribute (23)
L2 Bundle Member Attributes (25)
inter-AS reachability information (141)
MT-ISN (222)
MT IS Neighbor Attribute (223)
Reference
[RFC5305][RFC5316][RFC7370][RFC8668][RFC-ietf-lsr-multi-tlv-19]
Note
Allocations within this registry require documentation of the use of
the allocated value and approval by the Designated Expert assigned by
the IESG.
Note
The column for TLV 25 may be marked as follows:
y - sub-TLV may appear in TLV 25 but MUST NOT be shared by multiple L2 Bundle Members
y(s) - sub-TLV may appear in TLV 25 and MAY be shared by multiple L2 Bundle Members
n - sub-TLV MUST NOT appear in TLV 25
Available Formats
[IMG]
CSV
Type Description 22 23 25 141 222 223 MP Reference
0-2 Unassigned
3 Administrative group (color) y y y(s) y y y n [RFC5305]
4 Link Local/Remote Identifiers y y y(s) y y y n [RFC5307]
5 Unassigned
6 IPv4 interface address y y y(s) y y y n [RFC5305]
7 Unassigned
8 IPv4 neighbor address y y y(s) y y y n [RFC5305]
9 Maximum link bandwidth y y y(s) y y y n [RFC5305]
10 Maximum reservable link bandwidth y y y(s) y y y n [RFC5305]
11 Unreserved bandwidth y y y(s) y y y n [RFC5305]
12 IPv6 Interface Address y y y(s) y y y n [RFC6119]
13 IPv6 Neighbor Address y y y(s) y y y n [RFC6119]
14 Extended Administrative Group y y y(s) y y y n [RFC7308]
15 Link MSD y y y y y y y [RFC8491]
16 Application-Specific Link Attributes y y y(s) y y y y [RFC9479]
17 Generic Metric y y y y y y n [RFC9843, Section 2.1]
18 TE Default metric y y y(s) y y y n [RFC5305]
19 Link-attributes y y y(s) y y y n [RFC5029]
20 Link Protection Type y y y(s) y y y n [RFC5307]
21 Interface Switching Capability Descriptor y y y(s) y y y y [RFC5307]
22 Bandwidth Constraints y y y(s) y y y n [RFC4124]
23 Unconstrained TE LSP Count (sub-)TLV y y y(s) y y y n [RFC5330]
24 Remote AS Number n n n y n n n [RFC9346]
25 IPv4 Remote ASBR Identifier n n n y n n n [RFC9346]
26 IPv6 Remote ASBR Identifier n n n y n n n [RFC9346]
27 Interface Adjustment Capability Descriptor (IACD) y y y(s) y y y y [RFC6001]
28 MTU y y n n y y n [RFC7176]
29 SPB-Metric y y y(s) n y y n [RFC6329]
30 SPB-A-OALG y y y(s) n y y y [RFC6329]
31 Adjacency Segment Identifier y y n y y y n [RFC8667]
32 LAN Adjacency Segment Identifier y y n y y y n [RFC8667]
33 Unidirectional Link Delay y y y y y y n [RFC8570]
34 Min/Max Unidirectional Link Delay y y y y y y n [RFC8570]
35 Unidirectional Delay Variation y y y y y y n [RFC8570]
36 Unidirectional Link Loss y y y y y y n [RFC8570]
37 Unidirectional Residual Bandwidth y y y y y y n [RFC8570]
38 Unidirectional Available Bandwidth y y y y y y n [RFC8570]
39 Unidirectional Utilized Bandwidth y y y y y y n [RFC8570]
40 RTM Capability y y n n y y n [RFC8169]
41 L2 Bundle Member Adj-SID n n y n n n y [RFC8668]
42 L2 Bundle Member LAN Adj-SID n n y n n n y [RFC8668]
43 SRv6 End.X SID y y y y y y y [RFC9352, Section 8.1]
44 SRv6 LAN End.X SID y y y y y y y [RFC9352, Section 8.2]
45 IPv6 Local ASBR Identifier n n n y n n n [RFC9346]
46-160 Unassigned
161 Flood Reflector Adjacency y y n y y y n [RFC9377]
162-249 Unassigned
250-254 Reserved for Cisco-specific extensions
255 Reserved for future expansion
IS-IS Neighbor Link-Attribute Bit Values
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values for the Link-attributes sub-TLV (19)
advertised in TLVs advertising neighbor information. These TLVs are
listed in the description of the ¡°IS-IS Sub-TLVs for TLVs Advertising
Neighbor Information¡± registry.
Reference
[RFC5029][RFC9667][RFC9650]
Note
The "L2BM" column indicates applicability to the L2 Bundle Member
Attributes TLV. The options for the "L2BM" column are:
Y - This bit MAY appear in the L2 Bundle Member Attributes TLV.
N - This bit MUST NOT appear in the L2 Bundle Member Attributes TLV.
Available Formats
[IMG]
CSV
Value Name L2BM Reference
0x1 Local Protection Available N [RFC5029]
0x2 Link Excluded from Local Protection N [RFC5029]
0x4 Local Edge Enabled for Flooding (LEEF) N [RFC9667]
IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for TLVs advertising prefix reachability.
The list of TLVs includes:
SRv6 Locator (27)
IPv4 Algorithm Prefix Reachability TLV (126)
IPv6 Algorithm Prefix Reachability TLV (127)
Extended IP reachability (135)
MT IP Reach (235)
IPv6 IP Reach (236)
MT IPv6 IP Reach (237)
Reference
[RFC5305][RFC7370][RFC9352][RFC-ietf-lsr-multi-tlv-19]
Note
Allocations within this registry require documentation of the use of
the allocated value and approval by the Designated Expert assigned by
the IESG.
Available Formats
[IMG]
CSV
Type Description 27 126 127 135 235 236 237 MP Reference
0 Unassigned
1 32-bit Administrative Tag Sub-TLV y y y y y y y y [RFC5130]
2 64-bit Administrative Tag Sub-TLV y y y y y y y y [RFC5130]
3 Prefix Segment Identifier n n n y y y y n [RFC8667]
4 Prefix Attribute Flags y y y y y y y n [RFC7794]
5 SRv6 End SID y n n n n n n y [RFC9352, Section 7.2]
6 Flexible Algorithm Prefix Metric (FAPM) n n n y y y y n [RFC9350, Section 8]
7-10 Unassigned
11 IPv4 Source Router ID y y y y y y y n [RFC7794]
12 IPv6 Source Router ID y y y y y y y n [RFC7794]
13-31 Unassigned
32 BIER Info n n n y y y y y [RFC8401]
33-255 Unassigned
IS-IS Bit Values for Prefix Attribute Flags Sub-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values for the Prefix Attribute Flags (4)
sub-TLV advertised in Prefix Reachability TLVs. These TLVs are listed
in the description of the "IS-IS Sub-TLVs for TLVs Advertising Prefix
Reachability¡± registry.
Reference
[RFC7794]
Available Formats
[IMG]
CSV
Bit # Name Reference
0 External Prefix Flag (X-flag) [RFC7794]
1 Re-advertisement Flag (R-flag) [RFC7794]
2 Node Flag (N-flag) [RFC7794]
3 ELC Flag (E-flag) [RFC9088]
4 Anycast Flag (A-flag) [RFC9352, Section 6]
5 U-Flag [RFC-ietf-lsr-igp-ureach-prefix-announce-11, Section 3.2]
6 UP-Flag [RFC-ietf-lsr-igp-ureach-prefix-announce-11, Section 3.2]
IS-IS Group Address Type Codes for GADDR-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines Group Address Type Codes for the GADDR-TLV (142).
Reference
[RFC7176]
Available Formats
[IMG]
CSV
Type Description Reference
0 Reserved [RFC7176]
1 GMAC-ADDR [RFC7176]
2 GIP-ADDR [RFC7176]
3 GIPV6-ADDR [RFC7176]
4 GLMAC-ADDR [RFC7176]
5 GLIP-ADDR [RFC7176]
6 GLIPV6-ADDR [RFC7176]
7-254 Unassigned
255 Reserved [RFC7176]
IS-IS Sub-TLVs for MT-Port-Cap-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for the MT-Port-Cap-TLV (143).
Reference
[RFC7176]
Available Formats
[IMG]
CSV
Value Group Address Type Code Reference
0 Reserved [RFC7176]
1 VLAN-FLAGs [RFC7176]
2 Enabled-VLANs [RFC7176]
3 AppointedFwrdrs [RFC7176]
4 SPB-MCID [RFC6329]
5 SPB-Digest [RFC6329]
6 SPB-B-VID [RFC6329]
7 PORT-TRILL-VER [RFC7176]
8 VLANs-Appointed [RFC7176]
9-254 Unassigned
255 Reserved [RFC7176]
IS-IS Sub-TLVs for MT-Capability TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for the MT-Capability TLV (144).
Reference
[RFC6329][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Value Group Address Type Code MP Reference
0 Reserved [RFC6329]
1 SPB-Inst n [RFC6329]
2 SPB-I-OALG y [RFC6329]
3 SPBM-SI y [RFC6329]
4 SPBV-ADDR y [RFC6329]
5 Unassigned
6 NICKNAME y [RFC7176]
7 TREES n [RFC7176]
8 TREE-RT-IDs y [RFC7176]
9 TREE-USE-IDs y [RFC7176]
10 INT-VLAN y [RFC7176]
11-12 Unassigned
13 TRILL-VER n [RFC7176]
14 VLAN-GROUP y [RFC7176]
15 INT-LABEL y [RFC7176]
16 RBCHANNELS y [RFC7176]
17 AFFINITY y [RFC7176]
18 LABEL-GROUP y [RFC7176]
19-20 Unassigned
21 Topology sub-TLV y [RFC7813]
22 Hop sub-TLV n [RFC7813]
23 Bandwidth Constraint sub-TLV n [RFC7813]
24 Bandwidth Assignment sub-TLV n [RFC7813]
25 Timestamp sub-TLV n [RFC7813]
26-254 Unassigned
255 Reserved [RFC6329]
IS-IS Sub-TLVs for IS-IS Router CAPABILITY TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for the IS-IS Router CAPABILITY TLV (242).
Reference
[RFC7981][RFC-ietf-lsr-multi-tlv-19]
Note
Allocations within this registry require documentation of the use of
the allocated value and approval by the Designated Expert assigned by
the IESG.
Available Formats
[IMG]
CSV
Value Description MP Reference
0 Reserved
1 TE Node Capability Descriptor n [RFC5073]
2 Segment Routing Capability n [RFC8667]
3 TE-MESH-GROUP TLV (IPv4) y [RFC4972]
4 TE-MESH-GROUP TLV (IPv6) y [RFC4972]
5 PCED sub-TLV n [RFC5089]
6 NICKNAME y [RFC7176]
7 TREES n [RFC7176]
8 TREE-RT-IDs y [RFC7176]
9 TREE-USE-IDs y [RFC7176]
10 INT-VLAN y [RFC7176]
11 IPv4 TE Router ID n [RFC9346]
12 IPv6 TE Router ID n [RFC9346]
13 TRILL-VER n [RFC7176]
14 VLAN-GROUP y [RFC7176]
15 INT-LABEL y [RFC7176]
16 RBCHANNELS y [RFC7176]
17 AFFINITY y [RFC7176]
18 LABEL-GROUP y [RFC7176]
19 Segment Routing Algorithm n [RFC8667]
20 S-BFD Discriminators n [RFC7883]
21 Node-Admin-Tag n [RFC7917]
22 Segment Routing Local Block (SRLB) n [RFC8667]
23 Node MSD y [RFC8491]
24 Segment Routing Mapping Server Preference (SRMS Preference) n [RFC8667]
25 SRv6 Capabilities n [RFC9352, Section 2]
26 Flexible Algorithm Definition (FAD) n [RFC9350, Section 5.1]
27 IS-IS Area Leader n [RFC9667]
28 IS-IS Dynamic Flooding n [RFC9667]
29 IP Algorithm n [RFC9502, Section 5.1]
30 MP-TLV Support for TLVs with implicit support n [RFC-ietf-lsr-multi-tlv-19, Section 7.2]
31-160 Unassigned
161 Flood Reflection Discovery y [RFC9377]
162-255 Unassigned
IS-IS Sub-Sub-TLVs for SRv6 Capabilities Sub-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-sub-TLVs for the SRv6 Capabilities sub-TLV (25)
advertised in the IS-IS Router CAPABILITY TLV (242).
Reference
[RFC9352][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Value Description MP Reference
0 Reserved [RFC9352]
1-255 Unassigned
IS-IS SRv6 Capabilities Sub-TLV Flags
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values advertised in the Flags field of the
SRv6 Capabilities sub-TLV (25). This sub-TLV is advertised in the
IS-IS Router CAPABILITY TLV (242).
Reference
[RFC9352]
Available Formats
[IMG]
CSV
Type Description Reference
0 Unassigned
1 O-flag [RFC9352, Section 2]
2-15 Unassigned
IS-IS Application Identifiers for Generic Information TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines Application Identifiers for the Generic Information
TLV (251).
Reference
[RFC6823]
Available Formats
[IMG]
CSV
ID Value Description Allowed in Instance zero (y/n) Reference
0 Reserved [RFC6823]
1 TRILL n [RFC7357]
2-65535 Unassigned
IS-IS Sub-Sub-TLVs for BIER Info Sub-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-sub-TLV codes which may be advertised in the
BIER Info sub-TLV, which is advertised in Prefix Reachability TLVs.
These TLVs are listed in the description of the "IS-IS Sub-TLVs for
TLVs Advertising Prefix Reachability¡± registry.
Reference
[RFC8401][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Type Name MP Reference
0 Unassigned
1 BIER MPLS Encapsulation n [RFC8401]
2 BIER PHP Request n [RFC-ietf-bier-php-16]
3-255 Unassigned
IS-IS Sub-TLVs for Segment Identifier/Label Binding TLVs
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for Segment Identifier/Label Binding
TLVs. The list of TLVs includes:
Segment Identifier/Label Binding (149)
Multi-Topology Segment Identifier/Label Binding (150)
Reference
[RFC8667][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Type Description MP Reference
0 Reserved [RFC8667]
1 SID/Label n [RFC8667]
2 Unassigned
3 Prefix Segment Identifier n [RFC8667]
4-255 Unassigned
IS-IS Sub-Sub-TLV Codepoints for Application-Specific Link Attributes
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-sub-TLV codepoints for the Application-Specific
Link Attributes sub-TLV, which is advertised in TLVs advertising
neighbor information. These TLVs are listed in the description of the
¡°IS-IS Sub-TLVs for TLVs Advertising Neighbor Information¡± registry.
Reference
[RFC9479][RFC-ietf-lsr-multi-tlv-19]
Note
For future codepoints, in cases where the document that defines
the encoding is different from the document that assigns the
codepoint, the encoding reference MUST be to the document that
defines the encoding.
Note
If a link attribute can be advertised both as a sub-TLV of TLVs
advertising neighbor information and as a sub-sub-TLV of the
Application-Specific Link Attributes sub-TLV defined in [RFC9479],
then the same numerical code should be assigned to the link attribute
whenever possible.
Available Formats
[IMG]
CSV
Type Description MP Reference
0-2 Unassigned
3 Administrative group (color) n [RFC5305]
4-8 Unassigned
9 Maximum link bandwidth n [RFC5305]
10 Maximum reservable link bandwidth n [RFC5305]
11 Unreserved bandwidth n [RFC5305]
12-13 Unassigned
14 Extended Administrative Group n [RFC7308]
15-16 Unassigned
17 Generic Metric y [RFC9843, Section 2.1]
18 TE Default metric n [RFC5305]
19-32 Unassigned
33 Unidirectional Link Delay n [RFC8570]
34 Min/Max Unidirectional Link Delay n [RFC8570]
35 Unidirectional Delay Variation n [RFC8570]
36 Unidirectional Link Loss n [RFC8570]
37 Unidirectional Residual Bandwidth n [RFC8570]
38 Unidirectional Available Bandwidth n [RFC8570]
39 Unidirectional Utilized Bandwidth n [RFC8570]
40-255 Unassigned
IS-IS Sub-TLVs for Application-Specific SRLG TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for the Application-Specific SRLG TLV (TLV 238).
Reference
[RFC9479][RFC-ietf-lsr-multi-tlv-19]
Note
For future codepoints, in cases where the document that defines the
encoding is different from the document that assigns the codepoint,
the encoding reference MUST be to the document that defines the
encoding.
Available Formats
[IMG]
CSV
Value Description MP Reference
0-3 Unassigned
4 Link Local/Remote Identifiers n [RFC5307]
5 Unassigned
6 IPv4 interface address n [RFC5305]
7 Unassigned
8 IPv4 neighbor address n [RFC5305]
9-11 Unassigned
12 IPv6 Interface Address n [RFC6119]
13 IPv6 Neighbor Address n [RFC6119]
14-255 Unassigned
IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-sub-TLVs for SRv6 SID sub-TLVs. This includes
the following sub-TLVs:
SRv6 End SID (5) (Advertised in SRv6 Locator TLV (27))
SRv6 End.X SID (43) (Advertised in TLVs advertising neighbor information)
SRv6 LAN End.X SID (44) (Advertised in TLVs advertising neighbor information)
Reference
[RFC9352][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Type Description 5 43 44 MP Reference
0 Reserved [RFC9352]
1 SRv6 SID Structure y y y n [RFC9352]
2-255 Unassigned
IS-IS SRv6 Locator TLV Flags
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values advertised in the Flags field of the
SRv6 Locator TLV (27).
Reference
[RFC9352]
Available Formats
[IMG]
CSV
Value Description Reference
0 D-flag [RFC9352, Section 7.1]
1-7 Unassigned
IS-IS SRv6 End SID Sub-TLV Flags
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values advertised in the Flags field of the
SRv6 End SID sub-TLV (5), which is advertised in the SRv6 Locator TLV
(27).
Reference
[RFC9352]
Available Formats
[IMG]
CSV
Value Description Reference
0-7 Unassigned
IS-IS SRv6 Adjacency SID Sub-TLVs Flags
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values advertised in the Flags field of
SRv6 SID sub-TLVs associated with adjacencies. These sub-TLVs are
advertised in TLVs advertising neighbor information. The list of
sub-TLVs includes:
SRv6 End.X SID (43)
SRv6 LAN End.X SID (44)
Reference
[RFC9352]
Available Formats
[IMG]
CSV
Value Description Reference
0 B-flag [RFC9352, Section 8.1]
1 S-flag [RFC9352, Section 8.1]
2 P-flag [RFC9352, Section 8.1]
3-7 Unassigned
IS-IS Sub-Sub-TLVs for Flexible Algorithm Definition Sub-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Reference
[RFC9350][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Type Description MP Reference
0 Reserved [RFC9350]
1 Flexible Algorithm Exclude Admin Group n [RFC9350, Section 6.1]
2 Flexible Algorithm Include-Any Admin Group n [RFC9350, Section 6.2]
3 Flexible Algorithm Include-All Admin Group n [RFC9350, Section 6.3]
4 Flexible Algorithm Definition Flags n [RFC9350, Section 6.4]
5 Flexible Algorithm Exclude SRLG n [RFC9350, Section 6.5]
6 IS-IS Exclude Minimum Bandwidth n [RFC9843, Section 3.1.1]
7 IS-IS Exclude Maximum Delay n [RFC9843, Section 3.1.2]
8 IS-IS Reference Bandwidth n [RFC9843, Section 4.1.3.1]
9 IS-IS Bandwidth Threshold n [RFC9843, Section 4.1.3.2]
10 Flexible Algorithm Exclude Reverse Admin Group n [RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12, Section 5]
11 Flexible Algorithm Include-Any Reverse Admin Group n [RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12, Section 6]
12 Flexible Algorithm Include-All Reverse Admin Group n [RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12, Section 7]
13-255 Unassigned
IS-IS Sub-Sub-TLVs for Flood Reflection Discovery Sub-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry contains assigned sub-sub-TLV identifiers for Flood
Reflection Discovery purposes.
Reference
[RFC9377][RFC-ietf-lsr-multi-tlv-19]
Available Formats
[IMG]
CSV
Type Description MP Reference
0-160 Unassigned
161 Flood Reflection Discovery Tunnel Encapsulation Attribute n [RFC9377]
162-255 Unassigned
IS-IS Sub-TLVs for the Area Proxy TLV
Registration Procedure(s)
Expert Review with RFC Required
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for the Area Proxy TLV (TLV 20).
Reference
[RFC9666]
Available Formats
[IMG]
CSV
Value Name Reference
0 Unassigned
1 Area Proxy System Identifier [RFC9666]
2 Area SID [RFC9666]
3-255 Unassigned
IS-IS Sub-TLVs for Flooding Parameters TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines sub-TLVs for the Flooding Parameters TLV(21).
Reference
[RFC9681]
Available Formats
[IMG]
CSV
Type Description Reference
0 Reserved [RFC9681]
1 LSP Burst Size [RFC9681]
2 LSP Transmission Interval [RFC9681]
3 LSPs per PSNP [RFC9681]
4 Flags [RFC9681]
5 PSNP Interval [RFC9681]
6 Receive Window [RFC9681]
7-255 Unassigned
IS-IS Bit Values for Flooding Parameters Flags Sub-TLV
Registration Procedure(s)
Expert Review
Expert(s)
Chris Hopps, Hannes Gredler, Les Ginsberg
Description
This registry defines bit values for the Flags sub-TLV(4) advertised
in the Flooding Parameters TLV(21).
Reference
[RFC9681]
Note
In order to minimize encoding space, a new allocation should pick the
smallest available value.
Available Formats
[IMG]
CSV
Bit # Description Reference
0 Ordered acknowledgment (O-flag) [RFC9681]
1-63 Unassigned
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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