Cisco Nexus 7000 Series - Configuring IS-IS; Information about IS-IS

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9-1

Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x

OL-20002-02

Configuring IS-IS

This chapter describes how to configure Integrated Intermediate System-to-Intermediate System (IS-IS).

This chapter includes the following sections:

• Information about IS-IS, page 9-1

• Licensing Requirements for IS-IS, page 9-6

• Prerequisites for IS-IS, page 9-6

• Configuration Guidelines and Limitations, page 9-6

• Configuring IS-IS, page 9-6

• Verifying IS-IS Configuration, page 9-28

• Displaying IS-IS Statistics, page 9-29

• IS-IS Example Configuration, page 9-29

• Related Topics, page 9-30

• Default Settings, page 9-30

• Additional References, page 9-30

• Feature History for IS-IS, page 9-31

Information about IS-IS

IS-IS is an Interior Gateway Protocol (IGP) based on Standardization (ISO)/International Engineering

Consortium (IEC) 10589. Cisco NX-OS supports Internet Protocol version 4 (IPv4). IS-IS is a dynamic

link-state routing protocol that can detect changes in the network topology and calculate loop-free routes

to other nodes in the network. Each router maintains a link-state database that describes the state of the

network and sends packets on every configured link to discover neighbors. IS-IS floods the link-state

information across the network to each neighbor. The router also sends advertisements and updates on

the link-state database through all the existing neighbors.

Note Cisco NX-OS does not support IPv6 for IS-IS.

This section includes the following topics:

• IS-IS Overview, page 9-2

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