© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Defining VLANs Propagating VLAN Configurations with VTP

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v The VTP Domain Group of switches that exchange VLAN information VLANs administered centrally at a chosen switch

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v The VTP Protocol Advertises VLAN configuration information Maintains VLAN configuration consistency throughout a common administrative domain Sends advertisements on trunk ports only

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v VTP Modes Client Cannot create, change, or delete VLANs Forwards advertisements Synchronizes VLAN configurations Does not save in NVRAM Transparent Creates, modifies, and deletes local VLANs Forwards advertisements Does not synchronize VLAN configurations Saves configuration in NVRAM Server (default mode) Creates, modifies, and deletes VLANs Sends and forwards advertisements Synchronizes VLAN configurations Saves configuration in NVRAM

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Pruning DisabledPruning Enabled VTP Pruning Uses bandwidth more efficiently by reducing unnecessary flooded traffic Example: Station A sends broadcast; broadcast flooded only toward any switch with ports assigned to the red VLAN

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v VTP Operation VTP advertisements are sent as multicast frames. VTP servers and clients are synchronized to the latest revision number. VTP advertisements are sent every 5 minutes or when there is a change.

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v VTP Configuration Commands Configuring VTP vtp domain vtp mode vtp password Verifying VTP show vtp status show vtp counters

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Configuring a VTP Management Domain Configure each switch in the following order to avoid dynamic learning of the domain name: VTP password VTP domain name (case sensitive) VTP mode (server mode is the default)

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Configuring and Verifying VTP Switch#show vlan brief Displays a list of current VLANs Switch(config)#vtp mode Sets the VTP mode to server, client, or transparent Switch(config)#vtp domain domain_name Sets the VTP domain name Switch# show vtp status Displays the current settings for VTP Sets the VTP password Switch(config)#vtp password password_string

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Verifying the VTP Configuration Switch#show vtp status VTP Version : 2 Configuration Revision : 28 Maximum VLANs supported locally : 1005 Number of existing VLANs : 17 VTP Operating Mode : Client VTP Domain Name : BCMSN VTP Pruning Mode : Enabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x45 0x52 0xB6 0xFD 0x63 0xC8 0x49 0x80 Configuration last modified by at :04:49 Switch# Switch#show vtp status

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Verifying the VTP Configuration (Cont.) Switch#show vtp counters VTP statistics: Summary advertisements received : 7 Subset advertisements received : 5 Request advertisements received : 0 Summary advertisements transmitted : 997 Subset advertisements transmitted : 13 Request advertisements transmitted : 3 Number of config revision errors : 0 Number of config digest errors : 0 Number of V1 summary errors : 0 VTP pruning statistics: Trunk Join Transmitted Join Received Summary advts received from non-pruning-capable device Fa5/ Switch#show vtp counters

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Adding a Switch to an Existing VTP Domain Ensure a new switch has VTP revision 0 before adding it to a network.

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v Summary Switches in a VTP domain share VLAN information. VTP advertises VLAN information. VTP operates in one of three modes: server, client, or transparent. VTP Pruning uses available bandwidth more efficiently. VTP uses a specific process to distribute and synchronize VLAN information between switches. Various commands are used to configure and verify VTP operation on a switch. VTP commands should be applied in a particular order. Specific steps should be followed when adding a new switch to an existing VTP domain.

© 2006 Cisco Systems, Inc. All rights reserved.BCMSN v