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一、组网需求
1、如图所示，RouterA通过三个接口与RouterB直连，正常情况下，HostA通过RouterA的GE0/0/0接口与HostB进行数据传输。
为了提高HostA与HostB间数据传输的可靠性，用户希望当GE0/0/0接口出现故障时，能够优先将流量切换到GE0/0/1接口。
2、网络拓扑
3、配置思路
采用如下的思路配置主备接口备份：
配置各接口IP地址及HostA与HostB之间的静态路由，确保网络层互通。
在RouterA上配置GE0/0/0为主接口，GE0/0/1和GE0/0/2为GE0/0/0的备份接口，且GE0/0/1的优先级较高，实现主接口故障时，GE0/0/1优先提供备份服务。
配置主接口与备份接口相互切换的延时，避免主备接口频繁切换而导致网络震荡。
二、操作步骤
1、配置路由器接口IP地址
<Huawei>system-view
[Huawei]sysname RouterA
[RouterA]interface GigabitEthernet 4/0/0
[RouterA-GigabitEthernet4/0/0]ip address 192.168.1.254 24
[RouterA-GigabitEthernet4/0/0]q
[RouterA]interface GigabitEthernet 0/0/0
[RouterA-GigabitEthernet0/0/0]ip address 1.1.1.1 24
[RouterA-GigabitEthernet0/0/0]q
[RouterA]interface GigabitEthernet 0/0/1
[RouterA-GigabitEthernet0/0/1]ip address 2.2.2.1 24
[RouterA-GigabitEthernet0/0/1]q
[RouterA]interface GigabitEthernet 0/0/2
[RouterA-GigabitEthernet0/0/2]ip address 3.3.3.1 24
[RouterA-GigabitEthernet0/0/2]q
<Huawei>system-view
[Huawei]sysname RouterB
[RouterB]interface GigabitEthernet 4/0/0
[RouterB-GigabitEthernet4/0/0]ip address 192.168.2.254 24
[RouterB-GigabitEthernet4/0/0]q
[RouterB]interface GigabitEthernet 0/0/0
[RouterB-GigabitEthernet0/0/0]ip address 1.1.1.2 24
[RouterB-GigabitEthernet0/0/0]q
[RouterB]interface GigabitEthernet 0/0/1
[RouterB-GigabitEthernet0/0/1]ip address 2.2.2.2 24
[RouterB-GigabitEthernet0/0/1]q
[RouterB]interface GigabitEthernet 0/0/2
[RouterB-GigabitEthernet0/0/2]ip address 3.3.3.2 24
[RouterB-GigabitEthernet0/0/2]q2、配置静态路由
[RouterA]ip route-static 192.168.2.0 24 1.1.1.2
[RouterA]ip route-static 192.168.2.0 24 2.2.2.2
[RouterA]ip route-static 192.168.2.0 24 3.3.3.2
[RouterB]ip route-static 192.168.1.0 24 1.1.1.1
[RouterB]ip route-static 192.168.1.0 24 2.2.2.1
[RouterB]ip route-static 192.168.1.0 24 3.3.3.13、在RouterA上配置G0/0/0为主接口，G0/0/1和G0/0/2为备份接口，且G0/0/1和G0/0/2的优先级分别为30和20
[RouterA]interface GigabitEthernet 0/0/0
[RouterA-GigabitEthernet0/0/0]standby interface GigabitEthernet 0/0/1 30
[RouterA-GigabitEthernet0/0/0]standby interface GigabitEthernet 0/0/2 20
[RouterA-GigabitEthernet0/0/0]q4、在RouterA上配置接口相互切换延时为10秒
[RouterA]interface GigabitEthernet 0/0/0
[RouterA-GigabitEthernet0/0/0]standby timer delay 10 10
[RouterA-GigabitEthernet0/0/0]q5、查看配置结果
[RouterA]display standby state
Interface Interfacestate Backupstate Backupflag Pri Loadstate
GigabitEthernet0/0/0 UP MUP MU
GigabitEthernet0/0/1 STANDBY STANDBY BU 30
GigabitEthernet0/0/2 STANDBY STANDBY BU 20
Backup-flag meaning:
M---MAIN B---BACKUP V---MOVED U---USED
D---LOAD P---PULLED
----------------------------------------------------------------------------
Below is track BFD information:
Bfd-Name Bfd-State BackupInterface State
----------------------------------------------------------------------------
Below is track IP route information:
Destination/Mask Route-State BackupInterface State
----------------------------------------------------------------------------
Below is track NQA Information:
Instance Name BackupInterface State6、手动shutdown RouterA主接口G0/0/0，查看备份接口状态
[RouterA]interface GigabitEthernet 0/0/0
[RouterA-GigabitEthernet0/0/0]shutdown
[RouterA-GigabitEthernet0/0/0]q
[RouterA]display standby state
Interface Interfacestate Backupstate Backupflag Pri Loadstate
GigabitEthernet0/0/0 DOWN MDOWN MU
GigabitEthernet0/0/1 UP UP BU 30
GigabitEthernet0/0/2 STANDBY STANDBY BU 20
Backup-flag meaning:
M---MAIN B---BACKUP V---MOVED U---USED
D---LOAD P---PULLED
----------------------------------------------------------------------------
Below is track BFD information:
Bfd-Name Bfd-State BackupInterface State
----------------------------------------------------------------------------
Below is track IP route information:
Destination/Mask Route-State BackupInterface State
----------------------------------------------------------------------------
Below is track NQA Information:
Instance Name BackupInterface State