Alcatel-Lucent 7750 SR-OS, Руководство по настройке

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Page 376 7750 SR OS Router Configuration Guide
The lag-port-down event is considered to have a tiered event set state. While the priority impact per
number of ports down is totally configurable, as more ports go down, the effect on the associated
virtual router instances in-use priority is expected to increase (lowering the priority). When each
configured threshold is crossed, any higher thresholds are considered further event sets and are
processed ediately with the hold set timer reset to the configured value of the
hold-set command. As
the thresholds are crossed in the opposite direction (fewer ports down then previously), the priority
effect of the event is not processed until the hold set timer expires. If the number of ports down
threshold again increases before the hold set timer expires, the timer is only reset to the
hold-set
value if the number of ports down is equal to or greater than the threshold that set the timer.
The event contains number-down nodes that define the priority delta or explicit value to be used
based on the number of LAG composite ports that are in the operationally down state. These nodes
represent the event set thresholds. Not all port down thresholds must be configured. As the number of
down ports increase, the
number-down ports-down node that expresses a value equal to or less than
the number of down ports describes the delta or explicit priority value to be applied.
The no form of the command deletes the specific LAG monitoring event. The event can be removed
at anytime. When the event is removed, the in-use priority of all associated virtual router instances
must be reevaluated. The events
hold-set timer has no effect on the removal procedure.
Default no lag-port-down — No LAG priority control events are created.
Parameters lag-id — The LAG ID that the specific event is to monitor expressed as a decimal integer. The lag-id
can only be monitored by a single event in this policy. The LAG may be monitored by multiple
VRRP priority control policies. A port within the LAG and the LAG ID itself are considered to
be separate entities. A composite port may be monitored with the
port-down event while the
lag-id the port is in is monitored by a lag-port-down event in the same policy.
Values 1 — 200
number-down
Syntax [ no ] number-down number-of-lag-ports-down
Context config>vrrp>policy>priority-event>lag-port-down lag-id
Description This command creates a context to configure an event set threshold within a lag-port-down priority
control event.
The number-down command defines a sub-node within the lag-port-down event and is uniquely
identified with the number-of-lag-ports-down parameter. Each number-down node within the same
lag-port-down event node must have a unique number-of-lag-ports-down value. Each number-
down node has its own priority command that takes effect whenever that node represents the current
threshold.
The total number of sub-nodes (uniquely identified by the number-of-lag-ports-down parameter)
allowed in a single lag-port-down event is equal to the total number of possible physical ports
allowed in a LAG.
A number-down node is not required for each possible number of ports that could be down. The
active threshold is always the closest lower threshold. When the number of ports down equals a given
threshold, that is the active threshold.