HP 6125XLG R2306-HP 6125XLG Blade Switch High Availability Command Reference - Page 97

vrrp ipv6 vrid preempt-mode

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Usage guidelines When IPv6 VRRP operates in load balancing mode, the virtual IPv6 address of an IPv6 VRRP group cannot be the same as the IPv6 address of the interface where the VRRP group is configured. Otherwise, the load balancing mode cannot function. After you create IPv6 VRRP groups on the router, you can specify their operating mode through this command, and all IPv6 VRRP groups on the router operate in the specified mode. Examples # Specify the load balancing mode for IPv6 VRRP. system-view [Sysname] vrrp ipv6 mode load-balance Related commands display vrrp ipv6 vrrp ipv6 vrid preempt-mode Use vrrp ipv6 vrid preempt-mode to enable the preemptive mode for the router in an IPv6 VRRP group and configure the preemption delay time. Use undo vrrp ipv6 vrid preempt-mode to disable the preemptive mode for the router in an IPv6 VRRP group. Use undo vrrp ipv6 vrid preempt-mode delay to restore the default preemption delay. Syntax vrrp ipv6 vrid virtual-router-id preempt-mode [ delay delay-value ] undo vrrp ipv6 vrid virtual-router-id preempt-mode [ delay ] Default The router operates in preemptive mode and the preemption delay is 0 seconds. Views Interface view Predefined user roles network-admin Parameters virtual-router-id: Specifies an IPv6 VRRP group by its virtual router ID in the range of 1 to 255. delay delay-value: Specifies a preemption delay time in the range of 0 to 255 in seconds. The default setting is 0 seconds. Usage guidelines In non-preemptive mode, when a router in the IPv6 VRRP group becomes the master, it acts as the master as long as it operates normally, even if a backup is assigned a higher priority later. The non-preemptive mode helps avoid frequent switchover between the master and backups. In preemptive mode, a backup takes over as the master and sends VRRP advertisements when it detects that it has a higher priority than the master. The previous master then becomes a backup. This mechanism makes sure the master is always the router with the highest priority. 92

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92
Usage guidelines
When IPv6 VRRP operates in load balancing mode, the virtual IPv6 address of an IPv6 VRRP group
cannot be the same as the IPv6 address of the interface where the VRRP group is configured. Otherwise,
the load balancing mode cannot function.
After you create IPv6 VRRP groups on the router, you can specify their operating mode through this
command, and all IPv6 VRRP groups on the router operate in the specified mode.
Examples
# Specify the load balancing mode for IPv6 VRRP.
<Sysname> system-view
[Sysname] vrrp ipv6 mode load-balance
Related commands
display
vrrp ipv6
vrrp ipv6 vrid preempt-mode
Use
vrrp ipv6 vrid preempt-mode
to enable the preemptive mode for the router in an IPv6 VRRP group
and configure the preemption delay time.
Use
undo vrrp ipv6 vrid preempt-mode
to disable the preemptive mode for the router in an IPv6 VRRP
group.
Use
undo vrrp ipv6 vrid preempt-mode delay
to restore the default preemption delay.
Syntax
vrrp ipv6 vrid
virtual-router-id
preempt-mode
[
delay
delay-value
]
undo vrrp ipv6 vrid
virtual-router-id
preempt-mode
[
delay
]
Default
The router operates in preemptive mode and the preemption delay is 0 seconds.
Views
Interface view
Predefined user roles
network-admin
Parameters
virtual-router-id
: Specifies an IPv6 VRRP group by its virtual router ID in the range of 1 to 255.
delay
delay-value
: Specifies a preemption delay time in the range of 0 to 255 in seconds. The default
setting is 0 seconds.
Usage guidelines
In non-preemptive mode, when a router in the IPv6 VRRP group becomes the master, it acts as the master
as long as it operates normally, even if a backup is assigned a higher priority later. The non-preemptive
mode helps avoid frequent switchover between the master and backups.
In preemptive mode, a backup takes over as the master and sends VRRP advertisements when it detects
that it has a higher priority than the master. The previous master then becomes a backup. This mechanism
makes sure the master is always the router with the highest priority.