Managing Faults on Virtual Services Platform 7200 Series and 8000 Series Version 5.1.2

Chapter 3: Fault management fundamentals
Fault management includes the tools and features available to monitor and manage faults. This
section provides overview for local alarms, link stage changes (port flapping), and Connectivity Fault
Management.
Local alarms
The switch contains a local alarms mechanism. Local alarms are raised and cleared by applications
running on the switch. Active alarms are viewed using the show alarm database command in
ACLI. Local alarms are an automatic mechanism run by the system that do not require any
additional user configuration. Check local alarms occasionally to ensure no alarms require additional
operator attention. The raising and clearing of local alarms also creates a log entry for each event.
Link state change control
Rapid fluctuation in a port link state is called link flapping.
Link flapping is detrimental to network stability because it can trigger recalculation in spanning tree
and the routing table.
If the number of port down events exceeds a configured limit during a specified interval, the system
forces the port out of service.
You can configure link flap detection to control link state changes on a physical port. You can set
thresholds for the number and frequency of changes allowed.
You can configure the system to take one of the following actions if changes exceed the thresholds:
• send a trap
• bring down the port
If changes exceed the link state change thresholds, the system generates a log entry.
January 2017 Managing Faults on Avaya VSP 7200 Series and 8000 Series 12
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