I. networking requirements
1. As shown in the figure, RouterA is directly connected to RouterB through three interfaces. Normally, HostA transmits data to HostB through RouterA's GE0/0/0 interface.
In order to improve the reliability of data transmission between HostA and HostB, users hope that when the GE0/0/0 interface fails, they can preferentially switch the traffic to the GE0/0/1 interface.
2. Network topology
3. Configuration ideas
Use the following ideas to configure the backup of the primary and standby interfaces:
Configure the IP address of each interface and the static route between HostA and HostB to ensure the network layer interworking.
GE0/0/0 is configured as the main interface on RouterA, and GE0/0/1 and GE0/0/2 are the backup interfaces of GE0/0/0, and the priority of GE0/0/1 is higher. When the main interface fails, GE0/0/1 gives priority to providing backup services.
Configure the delay of switching between the main interface and the backup interface to avoid network vibration caused by frequent switching between the main interface and the backup interface.
II. Operation steps
1. Configure IP address of router interface
<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]q
2. Configure static route
[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 3.3.3.1
3. On RouterA, configure G0/0/0 as the main interface, G0/0/1 and G0/0/2 as the backup interface, and the priority of G0/0/1 and G0/0/2 are 30 and 20 respectively
[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]q
4. Configure the interface switching delay on RouterA to 10 seconds
[RouterA]interface GigabitEthernet 0/0/0 [RouterA-GigabitEthernet0/0/0]standby timer delay 10 10 [RouterA-GigabitEthernet0/0/0]q
5. View configuration results
[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 State
6. Manually shutdown RouterA main interface G0/0/0, and check the status of backup interface
[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