Huawei NetEngine80E Configuration Manual - Reliability page 166

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The view of an Eth-Trunk interface or Eth-Trunk sub-interface is displayed.
A fast VRRP backup group can be created only on an Eth-Trunk interface or Eth-Trunk sub-
interface.
Only one fast VRRP backup group can be created on an Eth-Trunk interface or Eth-Trunk sub-
interface. After a fast VRRP backup group is created, no other common VRRP backup group
can be created on the Eth-Trunk interface or Eth-Trunk sub-interface.
Step 3 Run:
vrrp vrid virtual-router-id fast
A fast VRRP backup group is created.
Step 4 (Optional) Run:
vrrp vrid virtual-router-id virtual-ip virtual-address
The virtual IP address of the fast VRRP backup group is configured.
Step 5 Run:
vrrp vrid virtual-router-id priority priority-value
The VRRP priority of the router in the fast VRRP backup group is set.
By default, the priority value is 100.
Step 6 (Optional) Run:
vrrp vrid virtual-router-id timer expire expire-time
The timeout period for backup devices to wait for receiving VRRP packets in a fast VRRP
backup group is set.
The default timeout period is 3 seconds.
Step 7 (Optional) Run:
vrrp vrid virtual-router-id preempt-mode timer delay delay-value
The preemption delay is set for the router in the fast VRRP backup group.
The default delay is 0 seconds, meaning immediate preemption. In a fast VRRP backup group
working in immediate preemption mode, a backup router can immediately preempt the Master
state when its priority is higher than that of the master router. After preemption is complete, the
master router becomes a backup router.
----End
Issue 02 (2014-09-30)
NOTE
Set the preemption delay value to 0 on the master router to allow it to become a backup device immediately
after its priority decreases; set the preemption delay to a non-0 value on backup routers so that they can
preempt the Master state after a specified delay. These settings allow a period of time for status
synchronization between the user-to-network link and network-to-user link on devices on an unstable
network. This implementation prevents user devices from learning about an incorrect master router's IP
address when two master routers coexist or a master/backup VRRP switchover is performed frequently.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4 VRRP Configuration
149