The isis suppress-reachability command enables IS-IS to suppress the advertisement of interface addresses so that they can be reused.
The undo isis suppress-reachability command restores the default setting.
By default, interface addresses can be advertised.
| Parameter | Description | Value |
|---|---|---|
| level-1 |
Suppresses the advertisement of only Level-1 interface addresses. |
- |
| level-1-2 |
Suppresses the advertisement of Level-1 and Level-2 interface addresses. |
- |
| level-2 |
Suppresses the advertisement of only Level-2 interface addresses. If no level is specified, the advertisement of Level-1-2 interface addresses is suppressed. |
- |
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Usage Scenario
If you want a local interface to be used only for topology connection, you can run the isis suppress-reachability command to enable IS-IS to suppress the advertisement of the local interface's IP address. This configuration prevents traffic whose destination IP address is the interface's IP address from being sent to the local device. In addition, this configuration also shields the local interface's IP address.