Juniper EX9200 Features Manual page 162

High Availability Feature Guide for EX9200 Switches
142
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
the priority hold time to expire before initiating mastership elections if a
tracked interface fails (state changes from
bandwidth for a tracked interface decreases. For more information about
asymmetric-hold-time
Routers" on page
There are two
priority-cost
statement specifies a threshold for the tracked interface. When
bandwidth-threshold
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. Just under the
statement there is a
priority-cost
when the interface is down.
The sum of the priority costs for all tracked logical interfaces 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.
Prior to Junos OS Release 15.1, an adjusted priority could not be zero. If the difference
between the priority costs and the configured priority of the VRRP group was zero, the
adjusted priority would become 1.
NOTE: In Junos OS Release 15.1 and later, an adjusted priority can be zero.
The priority value zero (0) indicates that the current master router has stopped
participating in VRRP. Such a priority value is used to trigger one of the backup routers
to quickly transition to the master router without having to wait for the current master
to time out.
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
asymmetric-hold-time
, see "Configuring the Asymmetric Hold Time for VRRP
139.
statements that show at this hierarchy level. The
statement that gives the value to subtract from priority
Table 8 on page
, VRRP does not wait for
to ), or if the available
up down
interface
143.
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