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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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Configuring LSP Fragment Extension

Configuring LSP Fragment Extension

Pre-configuration Tasks

Before configuring LSP fragment extension, complete the following task:


When a new device connects to an IS-IS network, you are advertised 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.


  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS view is displayed.

  3. 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.

  4. 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 99 virtual system IDs.

  5. Run commit

    The configuration is committed.

Verifying the Configuration

Run the following commands to check IS-IS process statistics.

  • display isis statistics [ level-1 | level-2 | level-1-2 ] [ process-id | vpn-instance vpn-instance-name ]
  • display isis process-id statistics [ [ level-1 | level-2 | level-1-2 ] | [ packet ] ]
Updated: 2019-03-21

Document ID: EDOC1000166601

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