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Software Configuration Guide—Release 12.2(25)EW
OL-6696-01
Chapter 27 Understanding and Configuring VTP
VTP Configuration Guidelines and Restrictions
Enabling VTP pruning on a VTP server enables pruning for the entire management domain. VTP pruning
takes effect several seconds after you enable it. By default, VLANs 2 through 1000 are eligible for
pruning. VTP pruning does not prune traffic from pruning-ineligible VLANs. VLAN 1 is always
ineligible for pruning; traffic from VLAN 1 cannot be pruned.
To configure VTP pruning on a trunking LAN interface, use the switchport trunk pruning vlan
command. VTP pruning operates when a LAN interface is trunking. You can set VLAN pruning
eligibility regardless of whether VTP pruning is enabled or disabled for the VTP domain, whether any
given VLAN exists, and regardless of whether the LAN interface is currently trunking.
VTP Configuration Guidelines and Restrictions
Follow these guidelines and restrictions when implementing VTP in your network:
• All network devices in a VTP domain must run the same VTP version.
• You must configure a password on each network device in the management domain when VTP is in
secure mode.
Caution If you configure VTP in secure mode, the management domain will not function properly if you do not
assign a management domain password to each network device in the domain.
• A VTP version 2-capable network device can operate in the same VTP domain as a network device
running VTP version 1 if VTP version 2 is disabled on the VTP version 2-capable network device
(VTP version 2 is disabled by default).
• Do not enable VTP version 2 on a network device unless all of the network devices in the same VTP
domain are version 2-capable. When you enable VTP version 2 on a server, all of the
version 2-capable network devices in the domain enable VTP version 2.
• Enabling or disabling VTP pruning on a VTP server enables or disables VTP pruning for the entire
management domain.
• Configuring VLANs as eligible for pruning on a Catalyst 4500 series switch affects pruning
eligibility for those VLANs on that switch only, not on all network devices in the VTP domain.
VTP Default Configuration
Table 27-1 shows the default VTP configuration.
Table 27-1 VTP Default Configuration
Feature Default Value
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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