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Log Reference

S9300, S9300E, and S9300X V200R010C00

This document provides the explanations, causes, and recommended actions of logs on the product.
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CSSM/6/FASTUPGRADEROLLBACK: CSS fast upgrade fails, causing chassis [ULONG] to roll back. The reason is: [STRING].


The chassis rolls back to the previous version when CSS fast upgrade fails.


Parameter Name Parameter Meaning
[ULONG] Indicates the chassis ID.
[STRING] Indicates the reason for the version rollback.

Possible Causes

Reason 1: The master chassis times out (expiry of the master chassis).

Reason 2: Registration of the standby chassis board expired.

Reason 3: Configuration restoration of the standby chassis board expired.


  • For reason 1, fast upgrade the CSS again or replace the software version and then run the reboot fast command to fast upgrade the CSS.
  • For reason 2, remove the board and then fast upgrade the CSS again.
  • For reason 3, remove the board and then fast upgrade the CSS again.
Updated: 2019-08-21

Document ID: EDOC1000142069

Views: 543472

Downloads: 37

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