The circuit default-tag command sets the administrative tag value for all interfaces in an IS-IS process.
The undo circuit default-tag command restores the default administrative tag value for all interfaces in an IS-IS process.
By default, the administrative tag value of all IS-IS interfaces is 0.
circuit default-tag tag [ level-1 | level-2 ]
undo circuit default-tag [ tag ] [ level-1 | level-2 ]
| Parameter | Description | Value |
|---|---|---|
| tag | Specifies the administrative tag value for all interfaces in an IS-IS process. | The value is an integer that ranges from 1 to 4294967295. |
| level-1 | Specifies the administrative tag value for all Level-1 interfaces in an IS-IS process. If no interface level is specified, the administrative tag values of Level-1 and Level-2 interfaces are set. | - |
| level-2 | Specifies the administrative tag value for all Level-2 interfaces in an IS-IS process. If no interface level is specified, the administrative tag values of Level-1 and Level-2 interfaces are set. | - |
Usage Scenario
The administrative tag carries management information about IP address prefixes to control the import of routes of different levels and areas. You can use the administrative tag to control the advertisement of IP address prefixes in an IS-IS routing domain to simplify route management.
The circuit default-tag command allows you to set the administrative tag value for all routes in an IS-IS process. You can filter routes based on the configured administrative tag value.
When the cost style of IS-IS is narrow or narrow-compatible, the administrative tag value is neither advertised nor takes effect in the LSP.
When the cost style of IS-IS is wide, wide-compatible, or compatible, the administrative tag value is advertised in the LSP.
Precautions
The value of the administrative tag configured through thecircuit default-tag command is the global administrative tag. The priority of the interface administrative tag configured by the isis tag-value command is higher than the priority of the global administrative tag.