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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Maintaining IS-IS

Maintaining IS-IS

Resetting IS-IS


To reset IS-IS, reset IS-IS data structure, neighbor relationship and packets

The IS-IS data structure cannot be restored after you reset it. All the previous structure information and the neighbor relationship are reset. Exercise caution when running this command.

The specified IS-IS neighbor relationship is deleted after you reset a specified IS-IS neighbor. Exercise caution when running this command.


  • Reset IS-IS data structure.

    Run the reset isis all[ process-id | vpn-instance vpn-instance-name ] command to reset IS-IS data structure.

  • Reset IS-IS neighbor relationship.

    Run the reset isis peer system-id [ process-id | vpn-instance vpn-instance-name ] command to reset a specific IS-IS neighbor.

    After the IS-IS routing policy or the protocol changes, you can reset a specific IS-IS neighbor to validate the new configuration.

  • Reset IS-IS packets

    Run the reset isis error [ process-id | vpn-instance vpn-instance-name ] or reset isis error interface interface-type interface-number command to clear information about incorrect LSPs and Hello packets received by the specified interface or process.

    Run the reset isis statistics packet [ interface [ interface-type interface-number ] ] or reset isis process-id statistics packet command to clear IS-IS packet statistics on the specified interface or process.

Improving the Maintainability of IS-IS


The administrator can improve the maintainability of IS-IS using either of the following methods:
  • Configuring IS-IS host name mapping: Through this function, the administrator can use a simple name to replace the system ID. After IS-IS host name mapping is configured, the dynamic name is displayed in the IS-IS information to replace the system ID when the display command is executed. This improves the maintainability of IS-IS networks.
  • Configuring IS-IS to add the POI TLV to a PURGE packet: When the value of the Remaining Lifetime field in an LSP packets is 0, this packet is invalid and called a PURGE packet. PURGE packets do not record information about the devices generating these packets. Therefore, when a network is faulty, the packet source cannot be located. To solve this problem, IS-IS can be configured to add the POI TLV to a PURGE packet so that the PURGE packet contains information about its generating device. If the dynamic host name function is configured locally, the host name TLV is also added to the PURGE packet to facilitate fault location.


  1. Run:


    The system view is displayed.

  2. Run:

    isis [ process-id ]

    The IS-IS view is displayed.

  3. Configure IS-IS host name mapping.

    • Run:
      is-name symbolic-name

      IS-IS dynamic host name mapping is configured and a host name is configured for the local device.

      This configuration is dynamic configuration. Therefore, the configured host name symbolic-name is advertised through an LSP to other IS-IS devices in the same area. When you use IS-IS display commands to view IS-IS information on other IS-IS devices, the system ID of the local device is replaced by the configured host name.

    • Run:
      is-name map system-id symbolic-name

      IS-IS static host name mapping is configured and a host name is configured for the remote device.

      This configuration is static configuration and takes effect only on the local device. Therefore, the configured host name symbolic-name is not advertised through an LSP.

  4. (Optional) Run:

    purge-originator-identification enable

    IS-IS is configured to add POI TLV to Purge packets. If a dynamic hostname has been configured for the local device, the hostname TLV is also added to the Purge packets.

  5. Run:


    The configuration is committed.

Updated: 2019-08-09

Document ID: EDOC1000041694

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