Command Manual – HA
H3C S7500E Series Ethernet Switches Chapter 1 VRRP Configuration Commands
1-21
<Sysname> system-view
[Sysname] vrrp ipv6 ping-enable
1.2.7 vrrp ipv6 vrid preempt-mode
Syntax
vrrp ipv6 vrid virtual-router-id preempt-mode [ timer delay delay-value ]
undo vrrp ipv6 vrid virtual-router-id preempt-mode [ timer delay ]
View
Interface view
Parameters
virtual-router-id: Virtual router ID or VRRP standby group number, in the range 1 to 255.
timer delay delay-value: Sets preemption delay. The delay-value argument is in the
range of 0 to 255 seconds and defaults to 0 seconds.
Description
Use the vrrp ipv6 vrid preempt-mode command to configure preemption on the
switch and configure its preemption delay in the specified standby group.
Use the undo vrrp ipv6 vrid preempt-mode command to disable preemption on the
switch in the specified standby group.
Use the undo vrrp ipv6 vrid preempt-mode timer delay command to restore the
default preemption delay, that is, zero seconds.
The default mode is immediate preemption without delay.
If you set the router in the standby group to work in non-preemption mode, the delay
period changes to zero seconds automatically.
On an instable network, the standby group member in the backup state may not
normally receive the packets from the master due to network congestion, resulting in
frequent master/backup state transition of the standby group members. Preemption
delay is introduced to solve this problem. With a preemption delay set, if the backup
does not receive the packet from the master duly, it waits for a period to see whether it
can receive any packet from the master. If the specified period elapses but it still
receives no packet from the master, it becomes the master.
Note that before executing the command, you need to create a standby group on an
interface and configure the virtual IPv6 address of the standby group.
Examples
# Enable preemption on the router in VRRP standby group 80 and set the preemption
delay to five seconds.
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