72CHAPTER 13: AUTO DETECT CONFIGURATION GUIDE

Auto Detect

You can implement VLAN interface backup through auto detect. When data can

Implementation in

be transmitted through two VLAN interfaces on the switch to the same

VLAN Interface

destination, configure one of the VLAN interfaces as the active interface and the

Backup

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

Figure 21 Network diagram of applying auto detect to VLAN interface backup

 

 

 

 

Vlan- int1

Vlan- int2

 

 

 

 

 

192.168.1.2 /24 Switch B 10.1.1 .3/24

 

 

 

 

 

Vlan-int1

 

Vlan -int2

 

 

 

 

 

192.168.1.1/24

 

10 .1.1.4/24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vlan-int2

Vlan- int1

 

 

 

Host A

Switch A

192.168.3.1/24

10.1.2.1/24

 

Host C

 

 

Switch C

 

 

 

 

Vlan-int2

Vlan-int1

 

 

 

 

 

192.168.3.2 /24

10.1.2 .2/24

 

 

 

Switch D

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.

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3Com 5500G, 4210, 4200G manual Vlan Interface