The virtual-system command sets the virtual system ID for an IS-IS process. If no virtual system ID is set, no extended LSP can be generated. A maximum of 50 virtual system IDs can be configured for an IS-IS process.
The undo virtual-system command deletes the virtual system ID of an IS-IS process.
By default, no virtual system ID is configured for an IS-IS process.
| Parameter | Description | Value |
|---|---|---|
| virtual-system-id | Specifies a virtual system ID for an IS-IS process. | The value is 6 bytes in length and in XXXX.XXXX.XXXX format. |
Like a common system ID, a virtual system ID must be unique in a routing domain.
The virtual-system command is used together with the lsp-fragments-extend command. The configured virtual system ID takes effect only when LSP fragment extension is enabled and the IS-IS process is restarted using the reset isis all command.
If LSP fragment extension is not enabled and the IS-IS process is not restarted, you can configure the virtual system ID but the configured virtual system ID does not take effect.
Before running this command, run the network-entity command in the IS-IS view to configure a network entity title for the IS-IS process.