Configuring Route Tags for IS-IS Interfaces

To configure a route tag for the IP addresses on an IS-IS interface:

Specify an IS-IS routing process, and access Router Configuration mode.host1(config)#router isis engineering host1(config-router)#
Configure a NET for the IS-IS process.host1(config-router)#net 47.0010.0000.0000.0000.0001.0001.1111.1111.1111.00
Configure the router to accept and generate only new-style TLV tuples with a wider metric field. New-style TLV tuples include TLV type 135, which contains the route tag.host1(config-router)#metric-style wide
Exit Router Configuration mode.host1(config-router)#exit
Specify the interface on which you want to route IS-IS.
The procedure assumes that at least one IP address is already configured on this interface.
host1(config)#interface atm 2/2.1
Configure a route tag for the interface.host1(config-subif)#isis tag 221
Specify the IS-IS process to apply to the interface.host1(config-subif)#ip router isis engineering
(Optional) Access Privileged Exec mode, and verify the route tag assignment.host1(config-subif)#exit host1(config)#exit host1#show isis database detail

isis tag

Use to set a route tag for the IP addresses on an IS-IS interface before the route is propagated to other routers in an IS-IS domain.
Specify a numeric tag value in the range 1–4294967295.
To make use of the route tag to modify route attributes or redistribute routes, you must reference the tag value in a route map.
Example host1(config)#interface atm 3/0 host1(config-if)#isis tag 45
Use the no version to remove the route tag from the interface.
See isis tag