Enabling Vtp Pruning; Monitoring Vtp; Vlans In The Vtp Database - Cisco Catalyst 2950 Software Manual

Chapter 8 Configuring VLANs

Enabling VTP Pruning

Pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic
must use to access the destination devices. You enable VTP pruning on a switch in VTP server mode.
Pruning is supported with VTP version 1 and version 2. If you enable pruning on the VTP server, it is
enabled for the entire VTP domain.
Only VLANs included in the pruning-eligible list can be pruned. By default, VLANs 2 through 1001 are
pruning-eligible on Catalyst 2950 trunk ports. For information, see the
List" section on page
Beginning in privileged EXEC mode, follow these steps to enable VTP pruning:
Command
Step 1
vlan database
Step 2
vtp pruning
Step 3
exit
Step 4 show vtp status

Monitoring VTP

You monitor VTP by displaying its configuration information: the domain name, the current VTP
revision, and the number of VLANs. You can also display statistics about the advertisements sent and
received by the switch.
Beginning in privileged EXEC mode, follow these steps to monitor VTP activity:
Command
Step 1 show vtp status
Step 2
show vtp counters

VLANs in the VTP Database

You can set these parameters when you add a new VLAN to or modify an existing VLAN in the VTP
database:
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Purpose
Enter VLAN configuration mode.
Enable pruning in the VTP administrative domain.
By default, pruning is disabled. You only need to enable pruning on one switch
in VTP server mode.
Update the VLAN database, propagate it throughout the administrative domain,
and return to privileged EXEC mode.
Verify your entries.
In the display, check the VTP Pruning Mode field.
Purpose
Display the VTP switch configuration information.
Display counters about VTP messages that have been sent and received.
VLAN ID
VLAN name
VLAN type (Ethernet, Fiber Distributed Data Interface [FDDI], FDDI network entity title [NET],
TRBRF or TRCRF, Token Ring, Token Ring-Net)
VLAN state (active or suspended)
Maximum transmission unit (MTU) for the VLAN
Catalyst 2950 Desktop Switch Software Configuration Guide
VLANs in the VTP Database
"Changing the Pruning-Eligible
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