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Alarm Handling

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the trap description, attributes, parameters, impact on the system, possible causes, procedures, and references. This document provides a complete set of traps, through which intended readers are kept of the running status of the device so as to locate faults.

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ISIS-STD_1. isisLSPTooLargeToPropagate

ISIS-STD_1. isisLSPTooLargeToPropagate


ISIS-STD/4/LARGE_LSP:OID [oid] The length of the PDU to be sent is greater than the MTU. (NotificationSysLevelIndex=[integer], CircIfIndex=[integer], PduLspSize=[integer], PduLspId=[opaque])

The length of a PDU to be sent is greater than the MTU.


Alarm ID Alarm Severity Alarm Type




Name Meaning


Indicates the MIB object ID of the alarm.


IS-IS level of a device that sends the trap


Interface index


LSP length



Impact on the System


Possible Causes

The length of the forwarded LSP was greater than the interface MTU.


  1. Run the display ip interface interface-type interface-number command to check the interface MTU, namely the The Maximum Transmit Unit field value.
  2. Run the display current-configuration configuration isis command to check the LSP length set in the IS-IS process. The lsp-length originate field value indicates that maximum LSP length. If the LSP length is not found in the command output, the default LSP length is used. By default, the maximum length of an LSP generated in an IS-IS process is 1497 bytes.
  3. Enter the IS-IS view, and run the lsp-length originate command to change the LSP length to be smaller than the interface MTU.
  4. Then check whether the trap is cleared.
    • If the trap is cleared, go to Step 6.
    • If the trap is not cleared, go to Step 5.
  5. Collect alarm information and configuration information, and then contact technical support personnel.
  6. End.

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Updated: 2019-03-06

Document ID: EDOC1100041475

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