Configuring Association Between Interface Backup And Bfd - Huawei AR2200-S Series Configuration Manual

Huawei AR2200-S Series Enterprise Routers
Configuration Guide - Reliability
Backup-flag meaning:
M---MAIN
D---LOAD
----------------------------------------------------------------------------
Below is track BFD information:
Bfd-Name
----------------------------------------------------------------------------
Below is track IP route information:
Destination/Mask
--------------------------------------------------------------------------------
Below is track NQA Information:
Instance Name
user
test
According to the preceding information, if the NQA test instance status is OK and the status of
the backup interface GigabitEthernet2/0/0 is STANDBY, the primary interface is transmitting
traffic.
If the NQA test instance status is ERR and the status of the backup interface is Up, the backup
interface is transmitting traffic.
<Huawei> display standby state
Interface
Backup-flag meaning:
M---MAIN
D---LOAD
----------------------------------------------------------------------------
Below is track BFD information:
Bfd-Name
----------------------------------------------------------------------------
Below is track IP route information:
Destination/Mask
--------------------------------------------------------------------------------
Below is NQA Information:
Instance Name
user
test

1.3.3 Configuring Association Between Interface Backup and BFD

To ensure nonstop traffic forwarding, associate interface backup with BFD. When the BFD
session detects faults on the primary link, it reports faults to the interface backup module. The
interface backup module then switches traffic to the backup link.
Applicable Environment
BFD provides fast fault detection independent of media and routing protocols. It can rapidly
detect faults on the forwarding path between two adjacent routers. Before configuring
association between interface backup and BFD, establish BFD sessions on RouterA and
RouterB to detect connectivity of the primary link. Generally, RouterA communicates with
RouterB through Interface1. To prevent service interruption due to the link fault, a low-speed
Issue 01 (2012-01-06)
B---BACKUP V---MOVED
P---PULLED
Bfd-State
Route-State
Interfacestate Backupstate Backupflag Pri
B---BACKUP V---MOVED
P---PULLED
Bfd-State
Route-State
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Copyright © Huawei Technologies Co., Ltd.
U---USED
BackupInterface
BackupInterface
BackupInterface
GigabitEthernet2/0/0
U---USED
BackupInterface
BackupInterface
BackupInterface
GigabitEthernet2/0/0
1 Interface Backup Configuration
State
State
State
OK
STANDBY
Loadstate
State
State
State
ERR
UP
9