486 TimeProvider 5000 User’s Guide 098-00028-000 Revision F – May, 2012
Appendix D Redundant IOC Cards
Causes of Switchovers Between IOC Cards
Emergency Switchovers
The TP5000 continuously monitors the health of both the active and standby IOC
cards. The TP5000’s switchover algorithms associate certain priority ranks
(Symmetricom-assigned) for different health conditions to determine which IOC is
healthiest at any time. If the TP5000 determines that the health of the IOC in the
Active state is worse than the health of the IOC in the Standby state, the TP5000 will
switch over the Active card to Standby, and vice-versa. The TP5000 will complete
the switch over to the standby card within 10 seconds. If the detected condition for
an Active card has a priority rank of “Failed”, the Standby card will be switched to
Active, but the Active card will be not become the Standby card because it has
become non-functional.
The TP5000 uses the Symmetricom-assigned priority ranks for the conditions or
alarms to determine switchover. The IOC switchover process will not be affected by
user changes to the alarm enable/disable state or severity.
The top priority rank category includes failures that are not recoverable. Items that
are ranked as lower priority include internal conditions or alarms that may recover.
The lowest priority rank includes loss-of-link of the IOC Ethernet ports. The
Ethernet link status is the only external condition that will cause an automatic
switchover.
Planned Switchovers
By Command
The user can also manually initiate a change to switch the states of the Active and
Standby cards.
First, use the command show ioc-state to display which IOC card is in the Active
state.
Example:
tp5000> show ioc-state
Response:
---------------------------------
|Module ID |State |
|---------------|---------------|
|ioc1 |active |
|...............|...............|
|ioc2 |standby |
---------------------------------
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