Juniper ACX2000 Configuration Guide

}
priority-hold-time seconds;
}
You can include these statements at the following hierarchy level:
•
[edit interfaces interface-name unit logical-unit-number family inet address address
vrrp-group group-id]
The interface specified is the interface to be tracked for the VRRP group. The priority hold
time is the minimum length of time that must elapse between dynamic priority changes.
A tracking event, such as an interface state change (up or down) or a change in bandwidth,
triggers one of the following responses:
•
The first tracking event initiates the priority hold timer, and also initializes the pending
priority based on the current priority and the priority cost. However, the current priority
remains unchanged.
•
A tracking event or a manual configuration change that occurs while the priority hold
timer is on triggers a pending priority update. However, the current priority remains
unchanged.
This ensures that Junos OS does not initiate mastership elections every time a tracked
interface flaps.
When the priority hold time expires, the current priority inherits the value from the pending
priority, and the pending priority ceases.
NOTE: If you have configured asymmetric-hold-time, VRRP does not wait for
the priority hold time to expire before initiating mastership elections if a
tracked interface fails (state changes from up to down), or if the available
bandwidth for a tracked interface decreases. For more information about
asymmetric-hold-time, see Configuring the Asymmetric Hold Time for VRRP
Routers.
The bandwidth threshold specifies a threshold for the tracked interface. When the
bandwidth of the tracked interface drops below the configured bandwidth threshold
value, the VRRP group uses the bandwidth threshold priority cost. You can track up to
five bandwidth threshold statements for each tracked interface.
The priority cost is the value to be subtracted from the configured VRRP priority when
the tracked logical interface goes down, forcing a new master router election. The value
can be from 1 through 254. The sum of the costs for all tracked logical interfaces or routes
must be less than or equal to the configured priority of the VRRP group.
If you are tracking more than one interface, the router applies the sum of the priority costs
for the tracked interfaces (at most, only one priority cost for each tracked interface) to
the VRRP group priority. However, the interface priority cost and bandwidth threshold
priority cost values for each VRRP group are not cumulative. The router uses only one
priority cost to a tracked interface as indicated in Table 46 on page 661:
Copyright © 2017, Juniper Networks, Inc.660
ACX Series Universal Access Router Configuration Guide

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English