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during boot-up stackmembers stay long in state "VLAN sync" when learning is disabled on some VLANs

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Titleduring boot-up stackmembers stay long in state "VLAN sync" when learning is disabled on some VLANs
Symptoms
When rebooting a stack with many VLANs (400+) and some of them have learning disabled, the stack-members stay very long in state "vlan sync"
Environment
  • EXOS stack
  • many VLANs
  • learning disabled on some VLANs
Cause
With many VLANs configured the VLAN syncing between stack-members during boot-up already takes some time, however when learning is also disabled on some VLANs and is enabled on others, this might take even longer as software-learning is then enabled on the specific ports and learning is then not done in hardware anymore.
Resolution
Either leave learning enabled on the ports, or upgrade to a version that includes xos0072870 (16.2.5.4-patch1-4 or higher for 16.2  or 22.7)
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