configure isis area interlevel-filter level 1-to-2

configure isis area area_name interlevel-filter level 1-to-2 [policy | none] {ipv4 | ipv6}


This command provides a method of restricting L1 routes from being redistributed into the L2 domain on an L1/L2 router.

Syntax Description

area_name Specifies the router process for which this configuration change applies.
policy Specifies a policy to control how L1 routes are redistributed.
none Removes any previously configured interlevel filters.
ipv4 | ipv6 Applies the interlevel filter to IPv4 or IPv6. If neither IPv4 nor IPv6 is specified, this command applies to IPv4.



Usage Guidelines

This command has no effect on level 1-only and level 2-only routers. Normally all L1 routes are redistributed into L2 on an L1/L2 router. Routes are permitted unless explicitly denied in the policy. This command does not necessarily disable level 1 to level 2 redistribution unless the configured policy effectively filters out all routes. For policies, the nlri match attribute is supported, and the permit and deny set attributes are supported.


The following command removes any previously configured interlevel filters in areax for IPv4:

configure isis area areax interlevel-filter level 1-to-2 none


This command was first available in ExtremeXOS 12.1.

Platform Availability

This command is available on platforms with a Core or Premier license as described in the ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.