The isis silent command configures an IS-IS interface as a silent interface. That is, the interface is suppressed from sending and receiving IS-IS packets, but the routes of the network that the interface belongs to can be advertised.
The undo isis silent command restores the interface to the default mode.
By default, no IS-IS interface is configured as the silent interface.
| Parameter | Description | Value |
|---|---|---|
| advertise-zero-cost | Specifies the route cost as 0. The default cost of IS-IS routes is 10. |
- |
Ethernet interface view, Ethernet sub-interface view, Eth-Trunk interface view, Eth-Trunk sub-interface view, Tunnel interface view, Loopback interface view, Dialer interface view, VLANIF interface view, Virtual-Template interface view
Usage Scenario
When an IS-IS network is connected to other ASs, IS-IS needs to be enabled on the interfaces that connect the IS-IS network to other ASs so that the routers on the IS-IS network can learn the routes to other ASs. The interfaces, however, unnecessarily advertise IS-IS Hello packets on their network segments. In this situation, you can run the isis silent command to suppress the interfaces.
Prerequisites
You have enabled IS-IS using the isis enable command in the interface view.