Alcatel-Lucent 7750 SR OS - Manual (Page 253)

VRRP
7750 SR OS Router Configuration Guide Page 253
Priority Policy Host Unreachable Event Commands
drop-count
Syntax drop-count consecutive-failures
no drop-count
Context config>vrrp vrrp-policy-id>priority-event>host-unreachable ip-addr
Description This command configures the number of consecutively sent ICMP echo request messages that must
fail before the host unreachable priority control event is set.
The drop-count command is used to define the number of consecutive message send attempts that
must fail for the host-unreachable priority event to enter the set state. Each unsuccessful attempt
increments the event’s consecutive message drop counter. With each successful attempt, the event’s
consecutive message drop counter resets to zero.
If the event’s consecutive message drop counter reaches the drop-count value, the host-unreachable
priority event enters the set state.
The event’s hold-set value defines how long the event must stay in the set state even when a
successful message attempt clears the consecutive drop counter. The event is not cleared until the
consecutive drop counter is less than the drop-count value and the hold-set timer has a value of zero
(expired).
The no form of the command reverts to the default value.
Default 3 — 3 consecutive ICMP echo request failures are required before the host unreachable priority
control event is set.
Parameters consecutive-failures — The number of ICMP echo request message attempts that must fail for the
event to enter the set state. It also defines the threshold so a lower consecutive number of failures
can clear the event state.
Values 1 — 60
host-unreachable
Syntax [no] host-unreachable ip-addr
Context config>vrrp vrrp-policy-id>priority-event
Description This command creates the context to configure a host unreachable priority control event to monitor
the ability to receive ICMP echo reply packets from an IP host address.
A host unreachable priority event creates a continuous ICMP echo request (ping) probe to the
specified ip-addr. If a ping fails, the event is considered to be set. If a ping is successful, the event is
considered to be cleared.
Multiple unique (different ip-addr) host-unreachable event nodes can be configured within the
priority-event node to a maximum of 32 events.