72 CHAPTER 13: AUTO DETECT CONFIGURATION GUIDE
Auto Detect Implementation in VLAN Interface Backup
You can implement VLAN interface backup through auto detect. When data can
be transmitted through two VLAN interfaces on the switch to the same
destination, configure one of the VLAN interfaces as the active interface and the
other as the standby interface. Through the auto detect function, the standby
interface is enabled automatically when the active fails, so as to ensure the data
transmission:
■In normal situations (that is, when the detected group is reachable), the
standby VLAN interface is down and packets are sent to the destination
through the active VLAN interface.
■When the communication between the active VLAN interface and the
destination fails (that is, the detected group is unreachable), the system
enables the backup VLAN interface.
■When the communication between the active VLAN interface and the
destination resumes, the system shuts down the standby VLAN interface again.
Network Diagram Figure21 Network diagram of applying auto detect to VLAN interface backup
Networking and
Configuration
Requirements
■Make sure that there is a route between Switch A and Switch B, Switch B and
Switch C, Switch A and Switch D, and Switch D and Switch C.
■Create detected group 10 on Switch A to detect the connectivity between
Switch A and Switch C.
■Configure VLAN-interface 1 to be the active interface, which is enabled when
the detected group 10 is reachable.
■Configure VLAN-interface 2 to be the standby interface, which is enabled
when the detected group 10 is unreachable.
■Create detected group 9 on Switch C to detect the connectivity between
Switch C and Switch A.
■Configure VLAN-interface 2 to be the active interface, which is enabled when
the detected group 9 is reachable.
■Configure VLAN-interface 1 to be the standby interface, which is enabled
when the detected group 9 is unreachable.
Vlan-int1
192.168.1.2/24
Vlan-int2
10.1.1.3/24
Vlan-int2
10.1.1.4/24
Vlan-int2
192.168.3.1/24
Host A Host C
Switch B
Switch A Switch C
Switch D
Vlan-int1
192.168.1.1/24
Vlan-int2
192.168.3.2/24
Vlan-int1
10.1.2.2/24
Vlan-int1
10.1.2.1/24