3com 4200G ユーザーズマニュアル

You can bind a static route with a detected group. The auto detect function will 
then detect the reachability of the static route through the path specified in the 
detected group.

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The static route is valid if the detected group is reachable.

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The static route is invalid if the detected group is unreachable.

Figure 19   Network diagram of applying auto detect to static routing

 

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Make sure 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.

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On Switch A, configure two static routes to Host C with different preferences. 
The one with higher preference (smaller value) is used as the master route, and 
the other as the backup route.

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Normally, Switch A adopts the master route to send data to Host C through 
Switch B.

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Create detected group 8 on Switch A; detect the reachability of IP address 
10.1.1.4/24, with the next hop being 192.168.1.2, and the detecting number 
being 1.

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If the detected group 8 is reachable, the master route is valid, and Switch A 
adopts the master route to send data to Host C through Switch B.

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If the detected group is unreachable, the master route is invalid, and Switch A 
adopts the backup route to send data to Host C through Switch D.

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Similarly, configure two static routes to Host A on Switch C. Normally, Switch C 
sends data to Host A through Switch B.

Vlan- int3

192 .168 .1.2 /24

Vlan-int2
10.1.1 .3/24

Vlan- int1

192 .168 .2.2 /24

Vlan -int2
10 .1.1.4/24

Vlan -int2
192 .168.3.1/24

Host A

192.168.2.1/24

Host C

10.1.3.1/24

Switch B

Switch A

Switch C

Switch D

Vlan -int3

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

Vlan -int3
10 .1.3.2/24