R3303-HP HSR6800 Routers High Availability Command Reference

155
A VRRP group member might need some time to back up ARP entries before it becomes the new master.
To reserve enough ARP entry backup time, configure a proper preemption delay for the VRRP group
based on the number of ARP entries.
Examples
# Enable ARP entry backup on GigabitEthernet 3/0/1 for IPv4 VRRP group 1.
<Sysname> system-view
[Sysname] interface gigabitethernet 3/0/1
[Sysname-GigabitEthernet3/0/1] vrrp vrid 1 virtual-ip 10.1.1.1
[Sysname-GigabitEthernet3/0/1] vrrp vrid 1 backup-arp
vrrp vrid preempt-mode
Use vrrp vrid preempt-mode to enable preemption on the router and configure its preemption delay in
a specific VRRP group.
Use undo vrrp vrid preempt-mode to disable preemption on the router in a specific VRRP group. As a
result, the router operates in non-preemptive mode.
Use undo vrrp vrid preempt-mode timer delay to restore the default preemption delay.
Syntax
vrrp vrid virtual-router-id preempt-mode [ timer delay delay-value ]
undo vrrp vrid virtual-router-id preempt-mode [ timer delay ]
Default
The router operates in preemptive mode and the preemption delay is zero seconds.
Views
Interface view
Default command level
2: System level
Parameters
virtual-router-id: Virtual router ID or VRRP group number in the range of 1 to 255.
timer delay delay-value: Sets preemption delay. The value range for the delay-value argument is 0 to 255
seconds. The default is 0 seconds.
Usage guidelines
To avoid frequent member state changes in a VRRP group and make the backups have enough time to
collect information (such as routing information), each backup waits for a period of time (the preemption
delay time) after it receives an advertisement with the priority lower than the local priority, and then sends
VRRP advertisements to start a new master election in the VRRP group and becomes the master.
Before executing the command, create a VRRP group on an interface and configure the virtual IP address
of the VRRP group.
Examples
# Enable preemption on the router in VRRP group 1, and set the preemption delay to five seconds.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1