Intermediate System to Intermediate System
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Intermediate System to Intermediate System (IS-IS, also written ISIS) is a link-state interior gateway protocol (IGP) used to exchange routing information within a network. Routers share network topology information so they can find the most efficient paths for data. IS-IS is typically deployed within a single autonomous system and is used in large enterprise and service provider networks.
~17 min read
Encyclopedic overview
19 sectionsContents
- Description
- History
- IS-IS terminology
- Packet types
- IS-IS addressing and NET
- Hostname resolution
- Areas and levels
- Attribute bits in LSPs
- Wide metrics
- Adjacency formation
- Broadcast segments and designated intermediate system
- Authentication
- IPv6 support and multi-topology
- IS-IS path selection
- BFD support
- Other uses
- Related protocols
- References
- External links
Intermediate System to Intermediate System (IS-IS, also written ISIS) is a link-state interior gateway protocol (IGP) used to exchange routing information within a network. Routers share network topology information so they can find the most efficient paths for data. IS-IS is typically deployed within a single autonomous system and is used in large enterprise and service provider networks.
The IS-IS protocol is defined in ISO/IEC 10589:2002 as an international standard within the Open Systems Interconnection (OSI) reference design.
Excerpted from Wikipedia’s “Intermediate System to Intermediate System” article, available under the CC BY-SA 4.0 licence.