Cisco WS-C2950SX-48-SI Configuration Manual page 246

Example VLAN Trunk Configurations
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Switch_1> (enable)
Step 8 Divide the configured VLANs into two groups. You might want traffic from one-half of the VLANs to
go over one trunk link and onehalf over the other trunk link; or if one VLAN has heavier traffic, you can
have traffic from that VLAN go over one trunk and traffic from the other VLANs go over the other trunk
link.
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 that you configured for those VLANs on Switch 1:
The port-VLAN priority for each VLAN must be equal on both ends of the link.
Caution
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.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
11-16
Chapter 11
30 blocking
40 blocking
50 blocking
60 blocking
1003 not-connected
1005 not-connected
Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 4 disabled
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Release 8.1
78-15486-01