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Page 248 7750 SR OS Router Configuration Guide
Priority Policy Port Down Event Commands
port-down
Syntax [no] port-down port-id
Context config>vrrp>policy>priority-event
Description This command configures a port down priority control event that monitors the operational state of a
port or SONET/SDH channel. When the port or channel enters the operational down state, the event
is considered set. When the port or channel enters the operational up state, the event is considered
cleared.
Multiple unique port-down event nodes can be configured within the priority-event context up to
the overall limit of 32 events. Up to 32 events can be defined in any combination of types.
The port-down command can reference an arbitrary port or channel. The port or channel does not
need to be pre-provisioned or populated within the system. The operational state of the port-down
event will indicate:
• Set – non-provisioned
• Set – not populated
• Set – down
• Cleared – up
When the port or channel is provisioned, populated, or enters the operationally up or down state, the
event operational state is updated appropriately.
When the event enters the operationally down, non-provisioned, or non-populated state, the event is
considered to be set. When an event transitions from clear to set, the set is processed immediately and
must be reflected in the associated virtual router instances in-use priority value. As the event
transitions from cleared to set, a hold set timer is loaded with the value configured by the events
hold-set command. This timer prevents the event from clearing until it expires, damping the effect of
event flapping. If the event clears and becomes set again before the hold set timer expires, the timer is
reset to the hold-set value, extending the time before another clear can take effect.
When the event enters the operationally up state, the event is considered to be cleared. Once the
events hold-set expires, the effects of the events priority value are immediately removed from the
in-use priority of all associated virtual router instances.
The actual effect on the virtual router instance in-use priority value depends on the defined event
priority and its delta or explicit nature.
The no form of the command deletes the specific port or channel monitoring event. The event may be
removed at anytime. When the event is removed, the in-use priority of all associated virtual router
instances will be re-evaluated. The events hold-set timer has no effect on the removal procedure.
Default no port-down - No port down priority control events are defined.
Parameters port-id — The port ID of the port monitored by the VRRP priority control event.
The port-id can only be monitored by a single event in this policy. The port can be monitored by
multiple VRRP priority control policies. A port and a specific channel on the port are considered