3com S7906E 설치 설명서

 

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For more information about STP and RRPP, refer to MSTP Configuration in the Access Volume and 

RRPP Configuration in the High Availability Volume. 

 

Smart Link is a feature developed to address the slow convergence issue with STP. It provides link 

redundancy as well as fast convergence in a dual uplink network, allowing the backup link to take over 

quickly when the primary link fails. To sum up, Smart Link features the following: 

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Dedicated to dual uplink networks 

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Subsecond convergence 

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Easy to configure 

A smart link group consists of only two member ports: the master and the slave. At a time, only one port 

is active for forwarding, and the other port is blocked, that is, in the standby state. When link failure 

occurs on the active port due to port shutdown or presence of unidirectional link for example, the 

standby port becomes active to take over while the original active port transits to the blocked state. 

As shown in 

, GE2/0/1 and GE2/0/2 of Device C and GE2/0/1 and GE2/0/2 of Device D each 

form a smart link group, with GE2/0/1 being active and GE2/0/2 being standby.  

Master port and slave port are two port roles in a smart link group. When both ports in a smart link group 

are up, the master port preferentially transits to the forwarding state, while the slave port stays in the 

standby state. Once the master port fails, the slave port takes over to forward traffic.  

As shown in 

, you can configure GE2/0/1 of Device C and that of Device D as master ports, 

and GE2/0/2 of Device C and that of Device D slave ports.  

The link that connects the master port in a smart link group is the master link; the link that connects the 

slave port is the slave link.  

A smart link group controls the forwarding state of some data VLANs, which are referred to as protected 

VLANs. Different smart link groups on a port control different protected VLANs. The state of the port in a 

protected VLAN is determined by the state of the port in the smart link group.  

Transmit control VLAN 

The transmit control VLAN is used for transmitting flush messages. When link switchover occurs, the 

devices (such as Device C and Device D in 

) broadcast flush messages within the transmit 

control VLAN.