H3C Technologies H3C S12500 Series Switches - Manual (Page 161)

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• If the state of a track entry changes from negative or invalid to positive, the priority of the router
where the track entry is configured is automatically restored.
Configuration procedure
By configuring router priority, preemptive mode, interface tracking, or a track entry, determine which
router in the VRRP group serves as the master.
To configure router priority, preemptive mode and interface tracking:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter the specified interface
view. interface interface-type
interface-number
N/A
3. Configure the priority of the
router in the VRRP group. vrrp ipv6 vrid virtual-router-id
priority priority-value Optional.
100 by default.
4. Configure the router in the
VRRP group to operate in
preemptive mode and
configure preemption delay of
the VRRP group.
vrrp ipv6 vrid virtual-router-id
preempt-mode [ timer delay
delay-value ]
Optional.
The router in the VRRP group
operates in preemptive mode and
the preemption delay is 0 seconds
by default.
5. Configure the interface to be
tracked.
vrrp ipv6 vrid virtual-router-id track
interface interface-type
interface-number [ reduced
priority-reduced ]
Optional.
No interface is being tracked by
default.
6. Configure VRRP to track a
specified track entry.
vrrp ipv6 vrid virtual-router-id track
track-entry-number [ reduced
priority-reduced | switchover ]
Optional.
Not configured by default.
Configuring VF tracking
Configuration prerequisites
Before you configure the VF tracking function, create a VRRP group and configure a virtual IPv6 address
for it.
Configuration guidelines
When you configure VF tracking, follow these guidelines:
• You can configure the VF tracking function when VRRP is operating in either standard protocol
mode or load balancing mode. However, the VF tracking function is effective only when VRRP is
operating in load balancing mode.
• By default, the weight of a VF is 255, and its lower limit of failure is 10.
• If the weight of a VF owner is higher than or equal to the lower limit of failure, the priority of the VF
owner is always 255 and does not change with the weight value. Therefore, if an uplink fails,
another VF takes over the VF owner's work and becomes the AVF only when the weight of the VF
owner decreases by a correctly specified value and becomes lower than the lower limit of failure.
In other words, the weight of the VF owner decreases by more than 245.