3com WX3000 Manuel D’Utilisation

 

1-3 

Figure 1-2 Network diagram of Smart Link operating mechanism 

BLOCK

Switch A

Switch B

GE 1/0 /1

GE1 /0/2

Switch C

Switch D

Switch E

GE1 /0/1

GE1 /0/2

GE 1/0 /3

GE 1/0/1

GE 1/0/2

GE1/0/3

GE 1/0/11

GE 1/0/12

 

 

As shown in 

, GigabitEthernet 1/0/1 on Switch A is active and GigabitEthernet 1/0/2 on Switch 

A is blocked. When the link connected to GigabitEthernet 1/0/1 fails, GigabitEthernet 1/0/1 is blocked 

automatically, and the state of GigabitEthernet 1/0/2 turns to active state.  

z 

When link switching occurs in the Smart Link group, MAC forwarding entries and ARP entries of 

each device in the network may be out of date. In order to guarantee correct packet transmission, 

you must enable the Smart Link device to send flush messages to notify the other devices in the 

network to refresh their own MAC forwarding entries and ARP entries. In this case, all the uplink 

devices must be capable of identifying flush messages from the Smart Link group and refreshing 

MAC forwarding entries and ARP entries.  

z 

On a Smart Link–enabled device, if a port is blocked due to link failure, the port remains blocked 

after the link recovers from the failure, and does not preempt the traffic resource. Therefore, the 

traffic stays stable. The port does not come into the forwarding state until the next link switching.  

 

Before configuring a member port of a Smart Link group, you must: 

z 

Disable the port to avoid loops, thus preventing broadcast storm. 

z 

Disable STP on the port. 

After completing the configuration, you need to enable the Ethernet ports disabled before configuring 

the Smart Link group. 

 

Complete the following tasks to configure Smart Link: