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Example VLAN Trunk Configurations
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)
Step 13
When you have configured the port-VLAN priorities on both ends of the link, the spanning tree
converges to use the new configuration.
Check the spanning tree port states on Switch 1 by entering the show spantree command. The Group 1
VLANs should be forwarding on Trunk 1 and blocking on Trunk 2. The Group 2 VLANs should be
blocking on Trunk 1 and forwarding 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
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)
Figure 11-3
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
11-16
Chapter 11
Vlan
Port-State
Cost
-------------
-----
1
forwarding
10
forwarding
20
forwarding
30
forwarding
40
blocking
50
blocking
60
blocking
1003
not-connected
1005
not-connected
Vlan
Port-State
Cost
-------------
-----
1
blocking
10
blocking
20
blocking
30
blocking
40
forwarding
50
forwarding
60
forwarding
1003
not-connected
1005
not-connected
shows the network after you configure VLAN traffic load-sharing.
Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
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
Priority
Fast-Start
--------
----------
19
32
disabled
19
32
disabled
19
32
disabled
19
32
disabled
19
1
disabled
19
1
disabled
19
1
disabled
19
32
disabled
19
4
disabled
Group-method
------------
Group-method
------------
78-12647-02
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Troubleshooting
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