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Chapter 11
Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
In this example, VLANs 10, 20, and 30 (Group 1) are forwarded over Trunk 1, and VLANs 40, 50, and
60 (Group 2) are forwarded over Trunk 2.
Step 9
On Switch 1, enter the set spantree portvlanpri command to change the port-VLAN priority for the
Group 1 VLANs on Trunk 1 (port 1/1) to an integer value lower than the default of 32:
Switch_1> (enable) set spantree portvlanpri 1/1 1 10
Port 1/1 vlans 1-9,11-1004 using portpri 32.
Port 1/1 vlans 10 using portpri 1.
Port 1/1 vlans 1005 using portpri 4.
Switch_1> (enable) set spantree portvlanpri 1/1 1 20
Port 1/1 vlans 1-9,11-19,21-1004 using portpri 32.
Port 1/1 vlans 10,20 using portpri 1.
Port 1/1 vlans 1005 using portpri 4.
Switch_1> (enable) set spantree portvlanpri 1/1 1 30
Port 1/1 vlans 1-9,11-19,21-29,31-1004 using portpri 32.
Port 1/1 vlans 10,20,30 using portpri 1.
Port 1/1 vlans 1005 using portpri 4.
Switch_1> (enable)
On Switch 1, change the port-VLAN priority for the Group 2 VLANs on Trunk 2 (port 1/2) to an integer
Step 10
value lower than the default of 32:
Switch_1> (enable) set spantree portvlanpri 1/2 1 40
Port 1/2 vlans 1-39,41-1004 using portpri 32.
Port 1/2 vlans 40 using portpri 1.
Port 1/2 vlans 1005 using portpri 4.
Switch_1> (enable) set spantree portvlanpri 1/2 1 50
Port 1/2 vlans 1-39,41-49,51-1004 using portpri 32.
Port 1/2 vlans 40,50 using portpri 1.
Port 1/2 vlans 1005 using portpri 4.
Switch_1> (enable) set spantree portvlanpri 1/2 1 60
Port 1/2 vlans 1-39,41-49,51-59,61-1004 using portpri 32.
Port 1/2 vlans 40,50,60 using portpri 1.
Port 1/2 vlans 1005 using portpri 4.
Switch_1> (enable)
Step 11
On Switch 2, change the port-VLAN priority for the Group 1 VLANs on Trunk 1 (port 1/1) to the same
value you configured for those VLANs on Switch 1.
Caution
The port-VLAN priority for each VLAN must be equal on both ends of the link.
Switch_2> (enable) set spantree portvlanpri 1/1 1 10
Port 1/1 vlans 1-9,11-1004 using portpri 32.
Port 1/1 vlans 10 using portpri 1.
Port 1/1 vlans 1005 using portpri 4.
Switch_2> (enable) set spantree portvlanpri 1/1 1 20
Port 1/1 vlans 1-9,11-19,21-1004 using portpri 32.
Port 1/1 vlans 10,20 using portpri 1.
Port 1/1 vlans 1005 using portpri 4.
Switch_2> (enable) set spantree portvlanpri 1/1 1 30
Port 1/1 vlans 1-9,11-19,21-29,31-1004 using portpri 32.
Port 1/1 vlans 10,20,30 using portpri 1.
Port 1/1 vlans 1005 using portpri 4.
Switch_2> (enable)
On Switch 2, change the port-VLAN priority for the Group 2 VLANs on Trunk 2 (port 1/2) to the same
Step 12
value you configured for those VLANs on Switch 1:
Switch_2> (enable) set spantree portvlanpri 1/2 1 40
Port 1/2 vlans 1-39,41-1004 using portpri 32.
Port 1/2 vlans 40 using portpri 1.
78-12647-02
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Example VLAN Trunk Configurations
11-15
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