This is the best design because each person’s permission is not limited by the physical location. Fortunately your office only has 5 floors so you can finish this task in some hours :) But just imagine if your company was bigger with 100-floor office and some VLANs needed to be added every month!Well, it will surely become a daunting task to add a new VLAN like this.VTP, a Cisco proprietary protocol, was designed by Cisco with the network engineer and administrator in mind, reducing the administration overhead and the possibility of error as described above in any switched network environment.When a new VLAN is created and configured on a switch without the VTP protocol enabled, this must be manually replicated to all switches on the network so they are all aware of the newly created VLAN.This information is then stored on each switch's NVRAM and any VLAN changes made to any switch must again be replicated manually on all switches.If the idea of manually updating all switches within your network doesn't scare you because your network is small, then imagine updating more than 15-20 switches a few times per week, so your network can respond to your organisation's needs...we got you thinking now?This topic describes the features that VLAN Trunking Protocol (VTP) offers to support VLANs.To help you understand the basic concept, this is a summary of what VTP is: “VTP allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network” VTP minimizes misconfigurations and configuration inconsistencies that can cause problems, such as duplicate VLAN names or incorrect VLAN-type specifications.
If you're responsible for a network of up to 4-6 switches that include a few VLANs, then you'll surely agree that it's usually a low overhead to administer them and periodically make changes - most engineers can live with that:) Ask now an engineer who's in charge of a medium to a large scale network and you will definately not receive the same answer, simply because these small changes can quickly become a nightmare and if you add the possibility of human error, then the result could be network outages and possibly downtime.Will there be an update on either switch, will SW1 wait for a Server advertisement or will something else happen all together? A few hours have passed, and we have had over 50 comments , ideas and theories.I appreciate you taking the time to work through this. SW1, will see that its configuration revision number is lower than SW2, and even though SW2 is a “client” SW1 will use the updated information in the VTP advertisement from SW2 to update to its VLAN database, and get in “sync” with the rest of the VTP domain, including knowing about VLAN 999.This chapter from Implementing Cisco IP Switched Networks (SWITCH) Foundation Learning Guide: (CCNP SWITCH 300-115) covers implementing VLANs and trunks in campus switched architecture, understanding the concept of VTP and its limitation and configurations, and implementing and configuring Ether Channel.This chapter covers the key concepts of VLANs, trunking, and Ether Channel to build the campus switched networks.