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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to IS-IS

Introduction to IS-IS

This section describes the definition and functions of IS-IS.


Intermediate System-to-Intermediate System (IS-IS) is an Interior Gateway Protocol (IGP) that runs within an autonomous system (AS). IS-IS is also a link-state routing protocol, using the shortest path first (SPF) algorithm to calculate routes.


IS-IS is a dynamic routing protocol initially designed by the International Organization for Standardization (ISO) for its Connectionless Network Protocol (CLNP).

To support IP routing, the Internet Engineering Task Force (IETF) extended and modified IS-IS in RFC 1195. This modification enables IS-IS to apply to TCP/IP and OSI environments. This type of IS-IS is called Integrated IS-IS or Dual IS-IS.

IS-IS stated in this document refers to Integrated IS-IS, unless otherwise stated.

In addition to IPv4 networks, IS-IS also applies to IPv6 networks to provide accurate routing information for IPv6 packets. IS-IS has good scalability, supports IPv6 network layer protocols, and is capable of discovering, generating, and forwarding IPv6 routes.

Updated: 2019-08-09

Document ID: EDOC1000041694

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