Huawei NetEngine80E Configuration Manual - Reliability page 139

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
l
Issue 02 (2011-09-10)
delay is unavailable for the IP address owner. For the VRRP backup group that needs
to support the preemption delay, the master virtual router cannot be configured as the
IP address owner.
Run the undo vrrp vrid
default preemption mode.
NOTE
On each router to be configured with a delay mode in a VRRP backup group, it is recommended
to configure backup routers with the immediate preemption mode (whose delay time is 0
seconds) and configure the master router with the preemption mode (whose delay time is
specified). Configuring the delay time for the master router can ensure that the original primary
link has enough time to restore and work stably, and then switch back. At the same time, the
backup link works normally. If the data is switched back to the original primary link, the
application is not affected.
For VRRP6, run the following commands:
1. Run:
system-view
The system view is displayed.
2. Run:
interface interface-type interface-number
The interface view is displayed.
3. Run:
vrrp6 vrid virtual-router-id preempt-mode timer delay delay-value
The delay time of preemption is configured on the router in the VRRP6 backup group.
By default, the preemption mode is enabled and the delay time of preemption is 0
seconds, indicating immediate preemption. In immediate preemption mode, a backup
router becomes the master router when detecting that its priority is higher than the
priority of the master router. Then, the original master router becomes a backup router.
After the delay time of preemption is set, a backup router can be delayed for a specified
period to preempt the master router.
You can run the vrrp6 vrid preempt-mode disable
preemption mode on the router of the VRRP6 backup group. In non-preemption mode,
after a certain router becomes the master router in the backup group and works
normally, another router cannot preempt the master router even if its priority is set to
a value higher than that of the master router.
When the IPv6 address owner recovers from a fault, the router immediately becomes
the master router despite the set delay time. The preemption delay refers to a period
during which a backup router waits for preempting the master router, whereas an IPv6
address owner is irrelevant to the preemption delay. In a VRRP6 backup group that
needs to be configured with the preemption delay, the master router cannot be
configured as the IPv6 address owner.
You can run the undo vrrp6 vrid preempt-mode
preemption mode.
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virtual-router-id preempt-mode command to restore the
4 VRRP Configuration
command to adopt the non-
command to restore the default
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