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Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
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Chapter 8 Configuring VTP
VTP Default Configuration
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 pruning eligible.
VTP pruning does not prune traffic from pruning-ineligible VLANs. VLAN 1 is always pruning
ineligible; traffic from VLAN 1 cannot be pruned.
To configure VTP pruning on a trunking LAN port, use the switchport trunk pruning vlan command
(see the “Configuring a Layer 2 Switching Port as a Trunk” section on page 7-8). VTP pruning operates
when a LAN port is trunking. You can set VLAN pruning eligibility when VTP pruning is enabled or
disabled for the VTP domain, when any given VLAN exists or not, and when the LAN port is currently
trunking or not.
VTP Default Configuration
Table 8-1 shows the default VTP configuration.
VTP Configuration Guidelines and Restrictions
Follow these guidelines and restrictions when implementing VTP in your network:
• Supervisor engine redundancy does not support nondefault VLAN data file names or locations. Do
not enter the vtp file file_name command on a router that has a redundant supervisor engine.
• Before installing a redundant supervisor engine, enter the no vtp file command to return to the
default configuration.
• 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 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 provided 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 network device, all of the
version 2-capable network devices in the domain enable VTP version 2.
• In a Token Ring environment, you must enable VTP version 2 for Token Ring VLAN switching to
function properly.
Table 8-1 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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