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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

is-type — router

Synopsis

is-type {level-1 | level-1-2 | level-2-only}
no is-type {level-1 | level-1-2 | level-2-only}

Configures

The level at which the IS-IS routing protocol will operate

Default

level-1-2

Description

This command sets the level at which the IS-IS routing protocol operates, which also defines the type of IS-IS router it is (station or area). By default, the router operates at both levels, which means it is both a station router and an area router.

level-1

The router performs only as a station router.

level-1-2

The router performs as both a station and an area router.

level-2-only

The router performs only as an area router.

Example

router isis
  is-type level-2-only

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