IS-IS
Technology & Computing abbreviation · Networking
| Stands for | Intermediate System to Intermediate System |
|---|---|
| Categories | Technology & Computing |
IS-IS stands for Intermediate System to Intermediate System, a networking abbreviation.
A link-state interior routing protocol, similar in operation to OSPF, widely used inside large ISP and carrier backbones. Because it runs directly over layer 2 rather than over IP, it was easy to extend for IPv6 and MPLS traffic engineering.
Example: The backbone runs IS-IS as the IGP, with BGP carrying customer routes on top.
Usage notes
Originally designed for the OSI protocol suite and standardized as ISO/IEC 10589; RFC 1195 (1990) extended it to carry IP routes. In OSI vocabulary a router is an "intermediate system" and a host an "end system", which explains the name. Pronounced "eye-ess eye-ess".
Related abbreviations
More networking abbreviations
- IMAP – Internet Message Access Protocol
- IP – Internet Protocol
- IPsec – Internet Protocol Security
- IPv4 – Internet Protocol version 4
- IPv6 – Internet Protocol version 6
- IRC – Internet Relay Chat
- iSCSI – Internet Small Computer Systems Interface
- ISP – Internet service provider
- IXP – Internet exchange point
- L2TP – Layer 2 Tunneling Protocol
- LAN – Local area network
- LDAP – Lightweight Directory Access Protocol