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Chapter 11
Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
Step 2
Display the problem on Switch 2 by entering the the show spantree and show spantree statistics
commands. The configuration mismatch exists until the port on Switch 2 is properly configured.
Switch 2> (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
4/1
4/2
<...output truncated...>
Switch 2> (enable) show spantree statistics 4/1
Port
SpanningTree enabled for vlanNo = 1
port spanning tree
state
port_id
port number
path cost
message age (port/VLAN)
designated_root
designated_cost
designated_bridge
designated_port
top_change_ack
config_pending
port_inconsistency
<...output truncated...>
Switch 2> (enable)
Step 3
Resolve the misconfiguration by completing the 802.1Q configuration on Switch 2:
Switch 2> (enable) set trunk 4/1 nonegotiate dot1q
Port(s) 4/1 trunk mode set to nonegotiate.
Port(s) 4/1 trunk type set to dot1q.
Switch 2> (enable) 2/20/1998,23:41:15:DISL-5:Port 4/1 has become dot1q trunk
Port 4/1 on Switch 2 changes from blocking mode to forwarding mode once the port-type inconsistency
is resolved (see
port to be blocked normally by spanning tree. In either case, the port state would change from
"type-pvid-inconsistent" to "blocking" in the show spantree output.)
78-12647-02
ieee
00-60-09-79-c3-00
32768
0
1/0
20 sec
Hello Time 2
00-60-09-79-c3-00
32768
Hello Time 2
Vlan
Port-State
-------------
1
not-connected
1
not-connected
1
type-pvid-inconsistent
1
not-connected
4/1 VLAN 1
BPDU-related parameters
Figure
11-6). (This assumes that there is no wiring loop present that would cause the
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
sec
Forward Delay 15 sec
sec
Forward Delay 15 sec
Cost
Priority
Fast-Start
-----
--------
----------
4
32
disabled
4
32
disabled
100
32
100
32
disabled
enabled
broken
0x8142
0x142
100
1(20)
00-60-09-79-c3-00
0
00-60-09-79-c3-00
0x8142
FALSE
FALSE
port_type & port_vlan
Example VLAN Trunk Configurations
Group-method
------------
disabled
11-19
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Troubleshooting
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