Understanding Vtp Pruning - Cisco 7604 Configuration Manual

Ios software configuration guide

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Understanding How VTP Works

Understanding VTP Pruning

VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as

broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth

by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate

network devices. By default, VTP pruning is disabled.

For VTP pruning to be effective, all devices in the management domain must support VTP pruning. On

devices that do not support VTP pruning, you must manually configure the VLANs allowed on trunks.

and port 2 on Switch 4 are assigned to the Red VLAN. A broadcast is sent from the host connected to

Switch 1. Switch 1 floods the broadcast, and every network device in the network receives it, even

though Switches 3, 5, and 6 have no ports in the Red VLAN.

You enable pruning globally on the Cisco 7600 series router (see the

Switching Port as a Trunk" section on page

Figure 13-1 Flooding Traffic without VTP Pruning

Catalyst series

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).

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

shows a switched network without VTP pruning enabled. Interface 1 on network Switch 1

13-7). You configure pruning on Layer 2 trunking LAN ports (see the

Catalyst series

Catalyst series

Catalyst series

shows the same switched network with VTP pruning enabled. The broadcast traffic from

Catalyst series

Configuring VTP

"Enabling VTP Pruning" section

"Configuring a Layer 2

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