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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 17 Configuring VTP
Configuring VTP
Enabling VTP pruning on a VTP server enables pruning for the entire management domain. Making
VLANs pruning-eligible or pruning-ineligible affects pruning eligibility for those VLANs on that device
only (not on all switches in the VTP domain). See the “Enabling VTP Pruning” section on page 17-14.
VTP pruning takes effect several seconds after you enable it. VTP pruning does not prune traffic from
VLANs that are pruning-ineligible. VLAN 1 and VLANs 1002 to 1005 are always pruning-ineligible;
traffic from these VLANs cannot be pruned. Extended-range VLANs (VLAN IDs higher than 1005) are
also pruning-ineligible.
VTP pruning is not designed to function in VTP transparent mode. If one or more switches in the
network are in VTP transparent mode, you should do one of these:
• Turn off VTP pruning in the entire network.
• Turn off VTP pruning by making all VLANs on the trunk of the switch upstream to the VTP
transparent switch pruning ineligible.
To configure VTP pruning on an interface, use the switchport trunk pruning vlan interface
configuration command (see the “Changing the Pruning-Eligible List” section on page 16-20). VTP
pruning operates when an interface is trunking. You can set VLAN pruning-eligibility, whether or not
VTP pruning is enabled for the VTP domain, whether or not any given VLAN exists, and whether or not
the interface is currently trunking.
Configuring VTP
This section includes guidelines and procedures for configuring VTP. These sections are included:
• Default VTP Configuration, page 17-6
• VTP Configuration Options, page 17-7
• VTP Configuration Guidelines, page 17-8
• Configuring a VTP Server, page 17-9
• Configuring a VTP Client, page 17-11
• Disabling VTP (VTP Transparent Mode), page 17-12
• Enabling VTP Version 2, page 17-13
• Enabling VTP Pruning, page 17-14
• Adding a VTP Client Switch to a VTP Domain, page 17-15
Default VTP Configuration
Table 17-2 shows the default VTP configuration.
Table 17-2 Default VTP Configuration
Feature Default Setting
VTP domain name Null.
VTP mode Server.
VTP version 2 enable state Version 2 is disabled.
VTP password None.
VTP pruning Disabled.
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