If the LSP capacity is insufficient, newly imported routes and new TLVs fail to be added to LSP fragments. In this case, you can use LSP fragment extension to increase the LSP capacity, restoring the LSP space. When the LSP space is restored, the system automatically attempts to re-add these routes and TLVs to LSP fragments.
The lsp-fragments-extend command enables LSP fragment extension on an IS-IS device in a specified mode and at a specified level. One LSP fragment occupies only one byte and therefore a maximum of 256 fragments are supported. If there are a great number of LSPs and the number of fragments exceeds 256, some information is lost. LSP fragment extension is introduced to address such a problem. You can run the virtual-system command to configure one or more virtual systems to support more than 256 LSP fragments.
The system view is displayed.
An IS-IS process is created, and the IS-IS process view is displayed.
Enable LSP fragment extension on an IS-IS device in a specified mode and at a specified level.