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7750 SR OS Router Configuration Guide
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-address
[
no
]
host-unreachable
ipv6-address
Context
config>vrrp>policy>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-address
. If a ping fails, the event is considered to be set. If a ping is successful, the event
is considered to be cleared.
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