Description

During a non‑ISSU (In‑Service Software Upgrade) OS upgrade on a chassis cluster, the SRX devices must maintain the same version of Junos OS across all nodes at any specific time.

This mismatch error shows during the node reboot when one of the nodes runs an OS version that is different from the other node during the cluster OS upgrade.

The mismatch logs can be found under /var/log/chassisd.

This mismatch can lead to synchronization and communication issues within the cluster setup.

Symptoms

Jun 1320:29:36 CHASSISD_VERSION_MISMATCH: Version mismatch:

chassisd message version 11 LCC 1 message version 11

local IPC version $Revision: 1175922 $

remote IPC version Unknown

Jun 1320:29:36 SCC: Version mismatch: LCC 1

SCC version CHASSISD release 21.2R3-S5.4 built by builder on2023-04-2702:23:32 UTC

LCC version CHASSISD release 21.2R3-S7.7 built by builder on2024-02-0515:18:03 UTC

 

For other OS versions you may see it as below:

Feb 19 18:22:55 LCC: send: lcc 0 sending swversion CHASSISD release 22.4R3-S2.11 built by builder on 2024-05-10 20:56:35 UTC
 SCC software version CHASSISD release 21.2R3-S3.5 built by builder on 2022-10-19 05:17:53 UTC

 

  • SCC (Switch-Card Chassis): This component runs only on the Primary Node, irrespective of which node is acting as primary. It is more related to the cluster context.
  • LCC (Line-Card Chassis): This runs on both the primary and secondary nodes; LCC0 runs on node0, and LCC1 runs on node1. LCC is related more to the Packet Forwarding Engine (PFE) cards.
  • CHASSISD_VERSION_MISMATCH Error: Focus on spotting the CHASSISD_VERSION_MISMATCH error, as the cause of the issue can vary based on how the upgrade was performed, and the recovery process may also change.
  • Output of show chassis cluster status: This command might show a normal output despite having a chassisd mismatch.
  • Synchronization Issues: This mismatch can lead to synchronization and communication issues within the cluster setup.

Solution

To recover from this issue, you may use the following KBs as reference:


Modification History

2024-11-05 : Article Created