The ipv6 circuit default-tag command sets the administrative tag value of all interfaces in IS-IS processes on an IPv6 network.
The undo ipv6 circuit default-tag command restores the default tag value.
By default, the administrative tag value of all interfaces in IS-IS processes on an IPv6 network is 0.
ipv6 circuit default-tag tag [ level-1 | level-2 ]
undo ipv6 circuit default-tag [ tag ] [ level-1 | level-2 ]
| Parameter | Description | Value |
|---|---|---|
| tag | Specifies the administrative tag value of an interface in an IS-IS process on an IPv6 network. | The value is an integer that ranges from 1 to 4294967295. |
| level-1 | Indicates the administrative tag value of all Level-1 interfaces in IS-IS processes on an IPv6 network. If the interface level is not specified, the administrative tag value is set for Level-1 and Level-2 interfaces. | - |
| level-2 | Indicates the administrative tag value of all Level-2 interfaces in IS-IS processes on an IPv6 network. If the interface level is not specified, the administrative tag value is set for Level-1 and Level-2 interfaces. | - |
Using the ipv6 circuit default-tag command, you can set the administrative tag value for all routes of a specified IS-IS process and use the tag to filter routes.
The administrative tag value is advertised together with the routing information.
When the cost style of IS-IS is narrow or narrow-compatible, the administrative tag value is not advertised in the LSP and does not takes effect.
When the cost style of IS-IS is wide, wide-compatible, or compatible, the administrative tag value is advertised in the LSP.
The ipv6 circuit default-tag command takes effect only after IPv6 is enabled for the IS-IS process using the ipv6 enable command.