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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE I Chapter 6 1

Implementing: VTP

VLAN Trunking Protocol

LAN Switching and Wireless

Chapter 4

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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 2

VTP (VLAN Trunking Protocol)

VTP is a Cisco proprietary protocol used to exchangeVLAN information across trunk links.

A switch can be in one of 3 VTP operating modesClient

Cannot create, modify or delete VLAN

Server

Can create, modify & delete VLAN

Transparent

Can create, modify, & delete LOCAL VLAN

Forwards VTP advertisements.

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VTP (VLANTrunking Protocol)

VTP pruning

Limits unnecessary dissemination of VLAN information.

Verify VTP configuration

Show VTP status

Show interfaces trunk

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Objectives

Explain the role of VTP in a converged switchednetwork

Describe the operation of VTP:

VTP domains,

VTP Modes,

VTP Advertisements,

VTP Pruning.

Configure VTP on Catalyst switches.

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What is VTP?

VTP allows a network manager to configure a switch sothat it will propagate VLAN configurations to otherswitches in the network.

VTP only learns about normal-rangeVLANs (VLAN IDs1 to 1005).

Extended-rangeVLANs (IDs greater than 1005) are notsupported by VTP.

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VTP Benefits

VTP provides:

VLAN configuration consistency across the network

Accurate tracking and monitoring of VLANs

Dynamic reporting of added VLANs across a network

Dynamic trunk configuration when VLANs are added to

the network

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7/23 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 7

VTP Components

VTPDomain-Consists of one or more interconnectedswitches.

All switches in a domain share VLAN configuration

details using VTP advertisements.

A router or Layer 3 switch defines the boundary of eachdomain.

VTPAdvertisements-VTP uses a hierarchy ofadvertisements to distribute and synchronize VLANconfigurations across the network.

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VTP Components

VTP Modes-A switch can be configured in one of threemodes: server, client, or transparent.

VTP Server-VTP servers advertise the VTP domainVLAN information to other VTP-enabled switches in thesame VTP domain.

VTP servers store the VLAN information for the entire

domainin NVRAM.The server is where VLANs can be created, deleted, orrenamed for the domain.

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VTP Components

VTPClient-VTP clients function the same way as VTPservers, but you cannot create, change, or deleteVLANs on a VTP client.

A VTP client only stores the VLAN information for theentire domainwhile the switch is on.

A switch reset deletes the VLAN information. You mustconfigure VTP client mode on a switch.

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VTP Components

VTPTransparent-Transparent switches forward VTPadvertisements to VTP clients and VTP servers.

Transparent switches do not participate in VTP.

VLANs that are created, renamed, or deleted ontransparent switches are local to that switch only.

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VTP Components

VTPPruning-VTP pruning increases network availablebandwidth by restricting flooded traffic to those trunklinks that the traffic must use to reach the destinationdevices.

Without VTP pruning, a switch floods broadcast,multicast, and unknown unicast traffic across all trunklinks within a VTP domain even though receivingswitches might discard them.

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Explain the Role of VTP in a ConvergedSwitched Network

Explain the role of VTP in a multi-switch network

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Describe the Operation of VTP

Describe the importance of the default VTPconfiguration

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Explain the role of domains in VTP

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Describe how VTP exchanges domain and VLANinformation between switches in the same VTP domain

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Configure VTP on the Switches in aConverged Network

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Summary

VTP is a Cisco proprietary protocol used to exchangeVLAN information across trunk links.

A switch can be in one of 3 VTP operating modes

Client

Cannot create, modify or delete VLAN

Server

Can create, modify & delete VLAN

Transparent

Can create, modify, & delete LOCAL VLAN

Forwards VTP advertisements.

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Summary

VTP pruning

Limits unnecessary dissemination of VLAN information.

Verify VTP configuration

Show VTP status

Show interfaces trunk

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End Chapter 4

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