IS-IS, Intermediate System-to-Intermediate System, ISO 10589

Protocol suite:	OSI, TCP/IP.
Type:	Interior gateway routing protocol.
MIME subtype:
SNMP MIBs:	iso.org.dod.internet.experimental.ISIS-MIB (1.3.6.1.3.37). iso.org.dod.internet.mgmt.mib-2.isisMIB (1.3.6.1.2.1.138).
Working groups:	isis, IS-IS for IP Internets.
Links:	IS-IS TLV codepoints.

Packet format:

TLV	Description	IIH	LSP	SNP	References
0
1	Area Addresses.	Y	Y	N
2	IIS Neighbors.	N	Y	N
3	ES Neighbors.	N	Y	N
4	Part. DIS.	N	Y	N
5	Prefix Neighbors.	N	Y	N
6	IIS Neighbors.	Y	N	N
7
8	Padding.	Y	N	N
9	LSP Entries.	N	N	Y
10	Authentication.	Y	Y	Y
11
12	Optional Checksum.	Y	N	Y	RFC 3358
13
14	LSPBufferSize.	N	Y	N
15
16	Encapsulation Cap.	N	Y	N
17 - 21
22	Extended IS Reachability.	N	Y	N	RFC 3784
23 - 41
42	DECnet Phase IV.	Y	N	N
43 - 65
66	Lucent Proprietary.	N	Y	N
67 - 127
128	IP internal reachability information.	N	Y	N	RFC 1195
129	Protocols supported.	Y	Y	N	RFC 1195
130	IP external reachability information.	N	Y	N	RFC 1195
131	Inter-Domain Routing Protocol information.	N	Y	Y	RFC 1195
132	IP interface addresses.	Y	Y	N	RFC 1195
133	(obsolete) Authentication Information.	N	N	N	RFC 1195
134	Traffic Engineering router ID.	N	Y	N	RFC 3784
135	Extended IP reachability.	N	Y	N	RFC 3784
136
137	Dynamic Hostname.	N	Y	N	RFC 2763
138	Shared Risk Link Group.	N	Y	N	RFC 4205
139 - 175
176 177	Nortel proprietary.	N	Y	N
178 - 210
211	Restart.	Y	N	N	RFC 3847
212 - 221
222	MT-ISN.	N	Y	N	RFC 5120
223 - 228
229	M-Topologies.	Y	Y	N	RFC 5120
230
231
232	IPv6 Intf. Addr.	Y	Y	N
233
234
235	MT IP. Reach.	N	Y	N	RFC 5120
236	IPv6 IP. Reach.	N	Y	N
237	MT IPv6 IP. Reach.	N	Y	N	RFC 5120
238
239
240	Point-to-Point Three-Way Adjacency.	Y	N	N	RFC 3373
241
242	IS-IS Router CAPABILITY.	N	Y	N	RFC 4971
243 - 249
250	experimental.	Y	Y	Y

RFCs:

[RFC 1142] OSI IS-IS Intra-domain Routing Protocol.

[RFC 1195] Use of OSI IS-IS for Routing in TCP/IP and Dual Environments.

[RFC 1629] Guidelines for OSI NSAP Allocation in the Internet.

[RFC 2763] Dynamic Hostname Exchange Mechanism for IS-IS.

[RFC 2966] Domain-wide Prefix Distribution with Two-Level IS-IS.

[RFC 2973] IS-IS Mesh Groups.

[RFC 2991] Multipath Issues in Unicast and Multicast Next-Hop Selection.

[RFC 3277] Intermediate System to Intermediate System (IS-IS) Transient Blackhole Avoidance.

[RFC 3358] Optional Checksums in Intermediate System to Intermediate System (ISIS).

[RFC 3359] Reserved Type, Length and Value (TLV) Codepoints in Intermediate System to Intermediate System.

[RFC 3373] Three-Way Handshake for Intermediate System to Intermediate System (IS-IS) Point-to-Point Adjacencies.

[RFC 3567] Intermediate System to Intermediate System (IS-IS) Cryptographic Authentication.

[RFC 3719] Recommendations for Interoperable Networks using Intermediate System to Intermediate System (IS-IS).

[RFC 3784] Intermediate System to Intermediate System (IS-IS) Extensions for Traffic Engineering (TE).

[RFC 3786] Extending the Number of Intermediate System to Intermediate System (IS-IS) Link State PDU (LSP) Fragments Beyond the 256 Limit.

[RFC 3787] Recommendations for Interoperable IP Networks using Intermediate System to Intermediate System (IS-IS).

[RFC 4124] Protocol Extensions for Support of Diffserv-aware MPLS Traffic Engineering.

[RFC 4205] Intermediate System to Intermediate System (IS-IS) Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS).

Category: Informational.
Defines IS-IS TLV 138 (Shared Risk Link Group).
Defines IS-IS sub-TLVs (22, 4) Link Local/Remote Identifiers, (22, 20) Link Protection Type, (22, 21) Interface Switching Capability Descriptor.
Updates:
RFC 3784.

[RFC 4444] Management Information Base for Intermediate System to Intermediate System (IS-IS).

[ISBN 0201657724] IS-IS: Deployment in IP Networks.

[RFC 1237] Guidelines for OSI NSAP Allocation in the Internet.