Cisco WS-C6506 Software Manual page 118

Example VLAN Trunk Configurations
On Switch 2, change the port-VLAN priority for the Group 1 VLANs on Trunk 1 (port 1/1) to the same
Step 11
value that you configured for those VLANs on Switch 1 by entering the set spantree portvlanpri
command.
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
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value that you configured for those VLANs on Switch 1 by entering the set spantree portvlanpri
command.
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.
Port 1/2 vlans 1005 using portpri 4.
Switch_2> (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_2> (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_2> (enable)
Note
Check the spanning-tree port states on Switch 1 by entering the show spantree command. The Group 1
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VLANs should forward on Trunk 1 and block on Trunk 2. The Group 2 VLANs should block on Trunk 1
and forward on Trunk 2.
Switch_1> (enable) show spantree 1/1
Port
--------- ----
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
5-26
When you configure the port-VLAN priorities on both ends of the link, the spanning tree
converges to use the new configuration.
Vlan Port-State
-------------
1 forwarding
10 forwarding
20 forwarding
30 forwarding
40 blocking
50 blocking
60 blocking
1003 not-connected
1005 not-connected
Cost Priority Fast-Start
----- -------- ----------
19 32 disabled
19 1 disabled
19 1 disabled
19 1 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 4 disabled
Chapter 5 Configuring Ethernet VLAN Trunks
Group-method
------------
OL-8978-04