Association Between Vrrp And Bfd To Implement A Rapid Active/Standby Switchover - Huawei AR530 Series Configuration Manual

Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Reliability
Figure 6-7 Association between VRRP and BFD/NQA/routing
HostB
HostA
HostB
As shown in
is the master and RouterB is the backup. RouterA and RouterB work in preemption mode.
BFD/NQA/routing is configured to detect faults on the link from RouterA to RouterE, and
association between VRRP and BFD/NQA/routing is configured on RouterA. When BFD/
NQA/routing detects the fault on the link from RouterA to RouterE, BFD/NQA/routing instructs
the master to adjust its priority. RouterB becomes the master through negotiation, ensuring that
user traffic is forwarded correctly.
6.3.3 Association Between VRRP and BFD to Implement a Rapid
Active/Standby Switchover
A VRRP group sends and receives VRRP Advertisement packets to determine the master and
backup statuses. When a VRRP group is faulty, the backup with the highest priority detects the
fault and switches to the master after the Master_Down_Interval timer expires. The switchover
period is at least 3s. During the switchover period, service traffic is still sent to the original
master, causing user traffic loss. Association between VRRP and BFD prevents traffic loss. After
a BFD session is configured between the master and the backup, and the BFD session is bound
to the VRRP group, the BFD session detects connectivity of the VRRP group. After detecting
a fault, the BFD session notifies the VRRP group of an active/standby switchover. This
mechanism implements millisecond-level switchover and reduces traffic loss.
Issue 01 (2014-11-30)
HostA
Switch
VRRP
Switch
VRRP
Figure 6-7, a VRRP group is configured between RouterA and RouterB. RouterA
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Master
RouterC
RouterA
RouterB RouterD
Backup
Backup
RouterC
RouterA
RouterB RouterD
Master
6 VRRP Configuration
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Internet
RouterE
10.1.1.0/24
Internet
RouterE
Service traffic
BFD/NQA/Routing
164