Major Mismatch for Stack Units

A major mismatch indicates an Inter-processor Communications (IPC)-related data structure change, an election algorithm change, or a version of the software that does not support stacking. This can happen when the software undergoes a major change (such as a change from 08.0.80 to 08.0.90). When a major mismatch occurs, the system logs and displays a message similar to the following.

T=5h38m43.9: Warning! Recv 6004 IPC in 10m from 609c.9f2a.97e0 e1/2/1: wrong version 105 != 107.
Please make sure all stack units run the same image.

In a major mismatch, the stack cannot be built and will not operate. You must download the correct version of the software to the mismatched units individually.