Huawei NetEngine80E Configuration Manual - Reliability page 170

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
vrrp vrid virtual-router-id timer advertise advertise-interval
An interval at which unicast VRRP Advertisement packets are sent is configured.
The default interval is 1 second.
Step 7 (Optional) Run:
vrrp vrid virtual-router-id preempt-mode timer delay delay-value
A preemption delay is set for the device in the unicast VRRP backup group.
The default delay is 0 seconds, indicating immediate preemption. In immediate preemption
mode, if the backup device finds that its priority is higher than the master device's priority, the
backup device immediately preempts the Master state. The original master device becomes the
backup device accordingly.
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Follow-up Procedure
After creating a unicast VRRP backup group, perform the following operations to implement
rapid master/backup VRRP switchovers to further improve network reliability:
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Issue 02 (2014-09-30)
NOTE
Set the preemption delay to 0 on the backup device to allow it to become the master device immediately
after its priority changes, or set the preemption delay to a non-0 value on the master device so that it can
preempt the Master state after a specified delay if a master/backup VRRP switchover is performed. These
settings allow a period of time for status synchronization between the user-to-network and network-to-user
links on devices on an unstable network. This prevents the situation in which user devices learn an incorrect
master device IP address when two master devices coexist or master/backup VRRP switchovers are
performed frequently.
Associate the unicast VRRP backup group with a VRRP-disabled interface.
1. Run the system-view command to enter the system view.
2. Run the interface loopback loopback-number command to enter the view of the
interface on which the unicast VRRP backup group is configured.
3. Run the vrrp vrid virtual-router-id track interface interface-type interface-
number [ increased value-increased | reduced value-reduced ] command to associate
the unicast VRRP backup group with a specified VRRP-disabled interface.
Associate the unicast VRRP backup group with an interface monitoring group.
1. Run the system-view command to enter the system view.
2. Run the interface loopback loopback-number command to enter the view of the
interface on which the unicast VRRP backup group is configured.
3. Run the vrrp vrid virtual-router-id track monitor-group monitor-group-name
failure-ratio failure-ratio-value { [ reduced reduced-value ] | link } command to
associate the unicast VRRP backup group with an interface monitoring group. When
the link failure ratio on the access or network side reaches a specified threshold, the
unicast VRRP backup group performs a master/backup switchover.
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