VRRP
Router Configuration Guide 437
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 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.
The hold-set timer be expired and the historical success rate must be met prior to the event operational
state becoming cleared.
The no form of the command deletes the specific IP host monitoring event. The event may be deleted
at anytime. When the event is deleted, the in-use priority of all associated virtual router instances must
be reevaluated. The event’s hold-set timer has no effect on the removal procedure.
Default no host-unreachable — No host unreachable priority events are created.
Parameters ip-addr — The IP address of the host for which the specific event will monitor connectivity. The
ip-addr can only be monitored by a single event in this policy. The IP address can be
monitored by multiple VRRP priority control policies. The IP address can be used in one or
multiple ping requests. Each VRRP priority control host-unreachable and ping destined to
the same ip-addr is uniquely identified on a per message basis. Each session originates a
unique identifier value for the ICMP echo request messages it generates. This allows received
ICMP echo reply messages to be directed to the appropriate sending application.
Values The following values apply to the 7450 ESS:
ipv4-address: a.b.c.d
Values The following values apply to the 7750 SR and 7950 XRS:
The link-local IPv6 address must have an interface name specified. The global IPv6 address
must not have an interface name specified.
interval
Syntax interval seconds
no interval
Context config>vrrp>priority-event>host-unreachable
Description This command configures the number of seconds between host unreachable priority event ICMP echo
request messages directed to the host IP address.
The no form of the command reverts to the default value.
ipv4-address: a.b.c.d
ipv6-address: x:x:x:x:x:x:x:x[-interface]
x: [0..FFFF]H
interface: 32 chars maximum, mandatory for link local addresses
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