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Chapter 10
Configuring VTP
Figure 10-2
Switch 1 is not forwarded to Switches 3, 5, and 6 because traffic for the Red VLAN has been pruned on
the links indicated (port 5 on Switch 2 and port 4 on Switch 4).
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 2–1000 are pruning eligible. VTP
pruning does not prune traffic from VLANs that are pruning ineligible. VLAN 1 is always pruning
ineligible; traffic from VLAN 1 cannot be pruned.
To make a VLAN pruning ineligible, enter the clear vtp pruneeligible command. To make a VLAN
pruning eligible again, enter the set vtp pruneeligible command. You can set VLAN pruning eligibility
regardless of whether VTP pruning is enabled or disabled for the domain. Pruning eligibility always
applies to the local device only, not for the entire VTP domain.
Figure 10-2
Flooded traffic
is pruned.
Switch 6
Default VTP Version 1 and Version 2 Configuration
Table 10-1
Table 10-1
Feature
VTP domain name
VTP mode
VTP version 2 enable state
VTP password
VTP pruning
VTP Version 1 and Version 2 Configuration Guidelines
This section describes the guidelines for implementing VTP in your network:
OL-8978-04
shows the same switched network with VTP pruning enabled. The broadcast traffic from
Flooding Traffic with VTP Pruning
Switch 4
Port 2
Port
4
Switch 2
Switch 5
Port
5
Switch 3
Switch 1
shows the default VTP configuration.
VTP Default Configuration
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Default VTP Version 1 and Version 2 Configuration
Red
VLAN
Port 1
Default Value
Null
Server
Version 1 is enabled (version 2 is disabled)
None
Disabled
10-5
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