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x600 Series Layer 3 Gigabit Ethernet Switches Installation Guide
55
Table 10. State Change Table
Event on Master Node
Reaction on
Master
Reaction on Stack
Member
Reaction on Stack
Member
With Resiliency Link Without Resiliency Link
Both stack links removed No change
Fallback action
1
Re-elect master
2
XEM-STK Removed or Faulty No change
Fallback action
1
Re-elect master
2
Hardware reset (or fault) Reset / offline Re-elect master
Re-elect master
2
Run the NO STACK ENABLE
command
3
No change
Fallback action
1
Not allowed
Displays Error Message
Software application problem
(lock-up or continual crashes)
Reboot as stack
member
Re-elect master Re-elect master
Software crash or lock-up
Frozen
4
Re-elect master Re-elect master
Power-down or PSU failure Powered down Re-elect master Re-elect master
Event on Stack Member
Node
Reaction on
Master
Reaction on Stack
Member
Reaction on Stack
Member
Both stack links removed No change
Fallback action
1
Re-elect master
2
XEM-STK removed or faulty No change
Fallback action
1
Re-elect master
2
Hardware reset (or fault) No change Reset/offline Reset/offline
Run the NO STACK ENABLE
command
3
No change
Fallback action
1
Fallback action
1
Software application failover
(lock-up or continual crashes)
No change Re-boot as slave Reboot as stack member
software crash or lock-up No change
Frozen
4
Frozen
4
Power-down / PSU failure No change Powered Down Powered down
1. The fallback action on a slave is first to run the fallback config script. Where there is no fallback
script, the switch will disable all its switch ports.
2. The stack member assumes the role of stack master. In specific situations, this condition could
result in a stack containing two masters. This would present problems with network management
and the control of links that were previously aggregated.
3. The following situation will apply to a switch that has been removed from the stack by the using the
NO STACK ENABLE command:
— The switch will be unaware of further faults within the stack it of which it was previously a mem-
ber.
— If this switch is powered cycled, all links previously shutdown will remain down as a result of
running the NO STACK ENABLE command”.
4. If the slave’s ports are still up, this may cause downstream switches with trunked ports to operate incorrectly.