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Chapter 11
Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
Figure 11-3 Parallel Trunk Configuration After Configuring VLAN Traffic Load-Sharing
VLANs 10, 20, 30, 40, 50, and 60: port-VLAN priority 32 (blocking)
1/1
VLANs 10, 20, 30, 40, 50, and 60: port-VLAN priority 32 (forwarding)
Figure 11-3
link fails, the other trunk link acts as an alternate forwarding path for the traffic previously traveling over
the failed link.
If Trunk 1 fails in the network shown in
from all the VLANs, as shown in the following example:
Switch_1> (enable) 04/21/1998,03:15:40:DISL-5:Port 1/1 has become non-trunk
Switch_1> (enable) show spantree 1/1
Port
--------- ----
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) 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)
78-12647-02
Trunk 2
Catalyst 4000
Switch 1
1/2
Trunk 1
shows that both trunks are utilized when the network is operating normally and, if one trunk
Vlan
Port-State
-------------
1
not-connected
Vlan
Port-State
-------------
1
learning
10
learning
20
learning
30
learning
40
forwarding
50
forwarding
60
forwarding
1003
not-connected
1005
not-connected
Vlan
Port-State
-------------
1
forwarding
10
forwarding
20
forwarding
30
forwarding
40
forwarding
50
forwarding
60
forwarding
1003
not-connected
1005
not-connected
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Catalyst 4000
Switch 2
1/1
1/2
Figure
11-3, STP reconverges to use Trunk 2 to forward traffic
Cost
Priority
Fast-Start
-----
--------
----------
19
32
disabled
Cost
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
Cost
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
Example VLAN Trunk Configurations
Group-method
------------
Group-method
------------
Group-method
------------
11-17
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Troubleshooting
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