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Chapter 3
VLANs
Verifying Trunk Links
To verify your trunk ports, use the show trunk command. If you have more
than one port trunking and want to see statistics on only one trunk port, you
can use the show trunk [port_number] command:
Console> (enable) sh trunk 2/12
Port Mode Encapsulation Status Native vlan
-------- ----------- ------------- ------------ -----------
2/12 on isl trunking 1
Port Vlans allowed on trunk
-------- ------------------------------------------------------
2/12 1-4
Port Vlans allowed and active in management domain
-------- ------------------------------------------------------
2/12 1
Port Vlans in spanning tree forwarding state and not pruned
-------- ------------------------------------------------------
2/12 1
Console> (enable)
On the 1900 switch, it is the same command, but it can be run only on
FastEthernet ports 26 and 27. For some reason, when the show trunk com-
mand is used, the IOS calls these ports A and B:
1900EN#sh trunk ?
A Trunk A
B Trunk B
1900EN#sh trunk a
DISL state: Auto, Trunking: On, Encapsulation type: ISL
1900EN#sh trunk ?
A Trunk A
B Trunk B
1900EN#sh trunk a ?
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