Brocade Communications Systems 8 Administrator's Manual page 25

If frame discard errors or any other configured areas exceed the currently effective threshold
settings, the Fabric Watch daemon can take one or more of the following actions:
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For complete information about port monitoring, including configuration examples, port setting
guidelines, and default settings, refer to
Port persistence
The data collected in port monitoring can vary a great deal over short time periods. Therefore, the
port can become a source of frequent event messages (the data can exceed the threshold range
and return to a value within the threshold range).
Fabric Watch uses port persistence for a port event that requires the transition of the port into a
marginal status. Fabric Watch does not record any event until the event persists for a length of time
equal to the port persistence time. If the port returns to normal boundaries before the port
persistence time elapses, Fabric Watch does not record any event.
To set the port persistence time, refer to
Port fencing
A port that is consistently unstable can harm the responsiveness and stability of the entire fabric
and diminish the ability of the management platform to control and monitor the switches within the
fabric. Port fencing is a Fabric Watch enhancement that takes the ports offline if the user-defined
thresholds are exceeded. Supported port types include physical ports, E_Ports, optical F_Ports
(FOP_Ports), copper F_Ports (FCU_Ports), and Virtual E_Ports (VE_Ports).
NOTE
Port fencing is not enabled by default. You must manually enable port fencing. Refer to
configuration using the portFencing command"
When a port that has exceeded its user-defined thresholds is fenced by software, the port is placed
into the disabled state and held offline, thereby removing the ability of the port to transmit or
receive frames. After a port is disabled, user intervention is necessary for frame traffic to resume
on the port.
Fabric Watch Administrator's Guide
53-1001770-01
Send an SNMP trap.
Log a RASlog message.
Send an E-mail alert.
Log a port log message.
Enable port fencing. Refer to
Switch monitoring components
"Port fencing" for more information.
"Port Monitoring" on page 57.
"Setting the port persistence time"
on page 75 for instructions.
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on page 74.
"Port fencing
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