Configuring LSP Fragment Extension
Pre-configuration Tasks
Before configuring LSP fragment extension, configure basic IPv6 IS-IS functions.
When a new device connects to an IS-IS network, you are advised to configure LSP fragment extension and virtual systems before establishing IS-IS neighbors or importing routes. If you establish IS-IS neighbors or import routes, which causes IS-IS to carry much information that cannot be loaded through 256 fragments, you must configure LSP fragment extension and virtual systems. The configurations, however, take effect only after you restart the IS-IS process.
Procedure
- Run system-view
The system view is displayed.
- Run isis [ process-id ]
The IS-IS view is displayed.
- Run lsp-fragments-extend [ [ level-1 | level-2 | level-1-2 ] | [ mode-1 | mode-2 ] ] *
LSP fragment extension is enabled in an IS-IS process.
By default, LSP fragment extension is disabled in an IS-IS process.
If the mode or level is not specified during the configuration of LSP fragment extension, mode-1 and level-1-2 are used by default.
If there are devices of other manufacturers on the network, LSP fragment extension must be set to mode-1. Otherwise, devices of other manufacturers cannot identify LSPs.
- Run virtual-system virtual-system-id
A virtual system is configured.
By default, no virtual system is configured.
To configure a switch to generate extended LSP fragments, you must configure at least one virtual system. The ID of the virtual system must be unique in the domain.
An IS-IS process can be configured with up to 50 virtual system IDs.
Verifying the Configuration
Run the following commands to check IS-IS process statistics.
- display isis statistics [ updated-lsp [ history ] ] [ level-1 | level-2 | level-1-2 ] [ process-id | vpn-instance vpn-instance-name ]
- display isis process-id statistics [ [ [ updated-lsp [ history ] ] [ level-1 | level-2 | level-1-2 ] ] | [ packet ] ]