31 Days Before Your CCNA Exam

102 31 Days Before Your CCNA ExamS3#show vtp statusVTP Version : 2Configuration Revision : 8Maximum VLANs supported locally : 64Number of existing VLANs : 9VTP Operating Mode: ClientVTP Domain Name: CCNAVTP Pruning Mode: DisabledVTP V2 Mode: DisabledVTP Traps Generation: DisabledMD5 digest: 0x43 0x68 0xD5 0x3B 0x58 0x79 0x68 0x0EConfiguration last modified by 172.17.99.31 at 3-1-93 00:33:01S3#Note Although configuring VTP does help manage the VLAN configuration in your networks,it is not required to create VLANs. In addition, VTP does not assign VLANs to switchports. You must manually assign VLANs to switch ports on each switch.To avoid using VTP on a switch, configure it to use transparent mode:Switch(config)#vtp mode transparentThe switch will not update its VLAN database from VTP messages but will still forward the VTPmessages out trunk interfaces. In addition, you can configure local VLANs on a switch in VTPtransparent mode.VTP TroubleshootingAlthough VTP provides a level of efficiency to your switched network by allowing you to configureyour VLAN database on a VTP server, VTP also has the potential to cause serious problems.To combat the misuse of VTP in production networks, Cisco created the following training tutorialon Cisco.com, which you should review as part of your preparation for the CCNA exam:http://www.cisco.com/warp/public/473/vtp_flash/The following steps are a systematic way to determine why VTP is not currently working asexpected.Step 1Step 2Step 3Confirm the switch names, topology (including which interfaces connect which switches),and switch VTP modes.Identify sets of two neighboring switches that should be either VTP clients or serverswhose VLAN databases differ with the show vlan command.On each pair of two neighboring switches whose databases differ, verify the following:a. At least one operational trunk should exist between the two switches (use the showinterfaces trunk, show interfaces switchport, or show cdp neighbors command).