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Example VLAN Trunk Configurations
Figure 11-6 802.1Q Trunking: Final Network Configuration
Trunk Type: 802.1Q
Trunk Mode: nonegotiate
Step 4
Verify the 802.1Q configuration on Switch 1 by entering the show trunk and show spantree commands:
Switch 1> (enable) show trunk 1/1
Port
--------
1/1
Port
--------
1/1
Port
--------
1/1
Port
--------
1/1
Switch 1> (enable) show spantree 1
VLAN 1
Spanning tree enabled
Spanning tree type
Designated Root
Designated Root Priority
Designated Root Cost
Designated Root Port
Root Max Age
Bridge ID MAC ADDR
Bridge ID Priority
Bridge Max Age 20 sec
Port
--------- ----
1/1
1/2
<...output truncated...>
Switch 1> (enable)
The output shows that port 1/1 is an 802.1Q trunk port, that its status is "trunking," and that the port-state
is "forwarding."
Verify the configuration on Switch 2 by entering the show trunk and show spantree commands:
Step 5
Switch 2> (enable) show trunk 4/1
Port
--------
4/1
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
11-20
Port 1/1
Trunk Type: 802.1Q
Trunk Mode: nonegotiate
4000
Switch 1
802.1Q Trunk
Mode
Encapsulation
-----------
-------------
nonegotiate
dot1q
Vlans allowed on trunk
---------------------------------------------------------------------
1-1005
Vlans allowed and active in management domain
---------------------------------------------------------------------
1-3,1003,1005
Vlans in spanning tree forwarding state and not pruned
---------------------------------------------------------------------
1005
ieee
00-60-09-79-c3-00
32768
0
1/1
20 sec
Hello Time 2
00-10-29-b5-30-00
49152
Hello Time 2
Vlan
Port-State
-------------
1
forwarding
1
not-connected
Mode
Encapsulation
-----------
-------------
nonegotiate
dot1q
Chapter 11
Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
Port 4/1
4000
Switch 2
Status
Native vlan
------------
-----------
trunking
1
sec
Forward Delay 15 sec
sec
Forward Delay 15 sec
Cost
Priority
Fast-Start
-----
--------
----------
4
32
disabled
4
32
disabled
Status
Native vlan
------------
-----------
trunking
1
Group-method
------------
78-12647-02
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Troubleshooting
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