A Qos mismatch has been detected in the stack. This occurs because versions of EXOS that are earlier than 12.2 reserved QoS profiles QP6 and QP7 for stack control traffic. From EXOS 12.2 onward, only QP7 is reserved. This means that when these versions are intermixed in the stack, the lower numbered version could send a stack control packet using QP6. When the higher numbered version node receives such a packet, it will process it at a lower priority than QP8. Thus QP8 traffic overload (such as could be caused by a network loop) could cause significant loss of stack protocol traffic and therefore destabilize the stack.
Quiesce user data traffic on the stack and either replace the nodes whose version is lower than EXOS 12.2 or upgrade them.
Error
At least one node in this stack is operating with an EXOS version that is earlier than 12.2. This may cause the stack to destabilize. Please upgrade and reboot all such nodes in this stack.
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