Chapter 8 Configuring VLANs
Using VTP
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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-05
Beginning in privileged EXEC mode, follow these steps to assign ports for
multi-VLAN membership:
Using VTP
VTP is a Layer 2 messaging protocol that maintains VLAN configuration
consistency by managing the addition, deletion, and renaming of VLANs on a
network-wide basis. VTP minimizes misconfigurations and configuration
inconsistencies that can cause several problems, such as duplicate VLAN names,
incorrect VLAN-type specifications, and security violations.
Before you create VLANs, you must decide whether to use VTP in your network.
Using VTP, you can make configuration changes centrally on a single switch,
such as a Catalyst 2900 XL or Catalyst 3500 XL switch, and have those changes
automatically communicated to all the other switches in the network. Without
VTP, you cannot send information about VLANs to other switches.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to be
added to the VLAN.
Step 3
switchport mode multi Enter the VLAN membership mode for multi-VLAN ports.
Step 4
switchport multi vlan vlan-list Assign the port to more than one VLAN.
Separate nonconsecutive VLAN IDs with a comma; use a
hyphen to designate a range of IDs.
Configuring a switch port for multi-VLAN mode causes
VTP to transition to transparent mode, which disables
VTP.
Step 5
end Return to privileged EXEC mode.
Step 6
show interface interface-id
switchport
Verify your entries.
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