Cisco Systems 3560 사용자 설명서

You can configure parallel trunks to share VLAN traffic by setting different path costs on a trunk and 
associating the path costs with different sets of VLANs, blocking different ports for different VLANs. 
The VLANs keep the traffic separate and maintain redundancy in the event of a lost link. 

In 

, Trunk ports 1 and 2 are configured as 100BASE-T ports. These VLAN path costs are 

assigned:

VLANs 2 through 4 are assigned a path cost of 30 on Trunk port 1.

VLANs 8 through 10 retain the default 100BASE-T path cost on Trunk port 1 of 19.

VLANs 8 through 10 are assigned a path cost of 30 on Trunk port 2.

VLANs 2 through 4 retain the default 100BASE-T path cost on Trunk port 2 of 19.

Beginning in privileged EXEC mode, follow these steps to configure the network shown in 

Define the interface to set the STP port priority, and enter interface 
configuration mode.

Assign the port priority of 16 for VLANs 8 through 10.

Return to global configuration mode.

Define the interface to set the STP port priority, and enter interface 
configuration mode.

Assign the port priority of 16 for VLANs 3 through 6.

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.

90573

Switch A

Switch B

Trunk port 1

VLANs 2

 – 

4 (path cost 30)

VLANs 8

 – 

10 (path cost 19)

Trunk port 2
VLANs 8

 – 

10 (path cost 30)

VLANs 2

 – 

4 (path cost 19)

Enter global configuration mode on Switch A.

Define the interface to be configured as a trunk, and enter interface 
configuration mode.