Table 2-8 Con?¬?guring a Port as an 802.1Q Trunk Port
Step Action Notes
1 Enter the interface con?¬?guration mode and
the port to be con?¬?gured for trunking:
SwitchX(con?¬?g)# interface int_type
int_number
After you enter the interface
command, the command-line
prompt changes from (con?¬?g) # to
(con?¬?g-if) #.
2 Con?¬?gure the port as a VLAN trunk:
SwitchX(con?¬?g-if)# switchport mode
trunk
Enable trunking on the selected
interface.
Example 2-1 Verifying Trunk Con?¬?guration, Parameters, and Port VLAN Information
SwitchX# sshhooww iinntteerrffaacceess ffaa00//1111 sswwiittcchhppoorrtt
Name: Fa0/11
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Implementing VLANs and Trunks 35
VLAN Creation
Before you create VLANs, you must decide whether to use VTP to maintain global VLAN
con?¬?guration information for your network.
The maximum number of VLANs is switch dependent. Many access layer Cisco Catalyst
switches can support up to 250 user-de?¬?ned VLANs.
Cisco Catalyst switches have a factory default con?¬?guration in which various default
VLANs are precon?¬?gured to support various media and protocol types.
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