Cisco WS-C6506 Software Manual page 117

Chapter 5 Configuring Ethernet VLAN Trunks
Switch_1> (enable) show spantree 1/2
Port
--------- ----
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
Switch_1> (enable)
Divide the configured VLANs into two groups. You might want traffic from half of the VLANs to go
Step 8
over one trunk link and half over the other, or if one VLAN has heavier traffic than the others, you can
forward traffic from that VLAN over one trunk and traffic from the other VLANs over the other trunk
link.
Note
On Switch 1, change the port-VLAN priority for the Group 1 VLANs on Trunk 1 (port 1/1) to an integer
Step 9
value lower than the default of 32 by entering the set spantree portvlanpri command.
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 by entering the set spantree portvlanpri command.
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)
OL-8978-04
Vlan Port-State
-------------
1 blocking
10 blocking
20 blocking
30 blocking
40 blocking
50 blocking
60 blocking
1003 not-connected
1005 not-connected
In the following steps, 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.
Cost Priority Fast-Start
----- -------- ----------
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 4 disabled
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Example VLAN Trunk Configurations
Group-method
------------
5-25