Huawei NetEngine80E Configuration Manual - Reliability page 178

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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Issue 02 (2014-09-30)
NOTE
1. If the IP address owner recovers, it switches to the Master state immediately without waiting
a specified preemption delay. This process violates the preemption delay setting. Therefore,
in a VRRP IPv6 backup group, the preemption delay and the IPv6 address owner cannot
be configured together.
2. Set the preemption delay value to 0 on the master router to allow it to become a backup
router 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 prevents the situation
where user devices learn about an incorrect master router's IP address when two master
routers coexist or a master/backup VRRP switchover is performed frequently.
Set the interval at which an ND packet is sent by the master router.
1. Run:
system-view
The system view is displayed.
2. Run:
vrrp gratuitous-arp timeout time
The interval at which ND packets are sent by the master router is set.
The ND packets sent by the master router carry the virtual MAC address. By default,
the master router sends an ND packet every 120s.
NOTE
The interval at which the master router sends an ND packet must be shorter than the aging time
of the ND entry on each user device.
– To restore the default interval at which an ND packet is sent, run the undo vrrp
gratuitous-arp timeout command in the system view.
– To disable the master router from sending ND packets, run the vrrp gratuitous-
arp timeout disable command in the system view.
Configure the interval at which VRRP IPv6 Advertisement packets are sent.
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 timer advertise advertise-interval
The interval at which VRRP IPv6 Advertisement packets are sent is configured.
The default interval is 1 second. If multiple VRRP IPv6 backup groups are configured,
increase the interval to prevent the VRRP IPv6 status from flapping.
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