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Timeout while rebooting stacked 460 switches

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TitleTimeout while rebooting stacked 460 switches
Symptoms
HAL timeout occurs while rebooting a stack with STP configuration.
Slot-1 Stack.2 # reboot
Are you sure you want to reboot the stack? (y/N) Yes
Error: Timed out - HAL is not responding
Environment
Summit stack
EXOS 15.1.1
Cause
The HAL time out issue is seen because of fast-convergence enabled(Default setting in EXOS) for L2 protocol.
With this enabled, the switch installs an ACL in STP ports during convergence scenarios to temporarily flood the packets.
Fast convergence ACLs are not required during reboot scenarios and if the number of STP ports are high in the configuration, HAL took more time which has led to the timeout.
Resolution
Upgrade the devices to the below version of code where CR# xos0062701 is fixed
15.6.4.2-patch1-2
16.1.2.14-patch1-2
15.7.3.1-patch1-2
21.1
16.2

Work-around:
The following command, the switch will not install these flood ACLs
configure forwarding L2-protocol fast-convergence off
Additional notes

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