Concept Guide

router isis
Allows you to enable the IS-IS routing protocol and to specify an IP IS-IS process.
Syntax
router isis [tag]
To disable IS-IS routing, use the no router isis [tag] command.
Parameters
tag (OPTIONAL) This is a unique name for a routing process. A null tag is assumed if the tag
option is not specied. The tag name must be unique for all IP router processes for a
given router.
Defaults Not congured.
Command Modes ROUTER ISIS
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
Congure a network entity title (the net command) to specify the area address and the router system ID.
Enable routing on one or more interfaces to establish adjacencies and establish dynamic routing.
You can congure only one IS-IS routing process to perform Level 2 routing. A level-1-2 designation performs
Level 1 and Level 2 routing at the same time.
Related Commands
• ip router isis — congures IS-IS routing processes for IP on interfaces and attaches an area designator to the
routing process.
• net — congures an IS-IS network entity title (NET) for a routing process.
• is-type — assigns a type for a given area.
set-overload-bit
To set the overload bit in its non-pseudonode LSPs, congure the router. This setting prevents other routers from using it as an
intermediate hop in their shortest path rst (SPF) calculations.
Syntax
set-overload-bit
To return to the default values, use the no set-overload-bit command.
Defaults Not set.
Command Modes
• ROUTER ISIS (for IPv4)
• CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (for IPv6)
Supported Modes Full–Switch
804 Intermediate System to Intermediate System (IS-IS)