Alcatel-Lucent 7750 SR-OS, Configuration Manual

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VRRP
7750 SR OS Router Configuration Guide Page 375
Priority Policy LAG Events Commands
lag-port-down
Syntax [ no ] lag-port-down lag-id
Context config>vrrp>policy>priority-event
Description
This command creates the context to configure Link Aggregation Group (LAG) priority control
events that monitor the operational state of the links in the LAG.
The lag-port-down command configures a priority control event. The event monitors the operational
state of each port in the specified LAG. When one or more of the ports enter the operational down
state, the event is considered to be set. When all the ports enter the operational up state, the event is
considered to be clear. As ports enter the operational up state, any previous set threshold that
represents more down ports is considered cleared, while the event is considered to be set.
Multiple unique lag-port-down event nodes can be configured within the priority-event node up to
the maximum of 32 events.
The lag-port-down command can reference an arbitrary LAG. The lag-id does have to already exist
within the system. The operational state of the lag-port-down event will indicate:
• Set – non-existent
• Set – one port down
• Set – two ports down
• Set – three ports down
• Set – four ports down
• Set – five ports down
• Set – six ports down
• Set – seven ports down
• Set – eight ports down
• Cleared – all ports up
When the lag-id is created, or a port in lag-id becomes operationally up or down, the event
operational state must be updated appropriately.
When one or more of the LAG composite ports enters the operationally down state or the lag-id is
deleted or does not exist, the event is considered to be set. When an event transitions from clear to set,
the set is processed ediately and must be reflected in the associated virtual router instances in-use
priority value. As the event transitions from clear 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.