Access List Based VLAN Map Architecture and Modified 802.1q Frame Scheme for Addressing VTP Issues

Abstract

Cisco's VLAN Trunk Protocol reduces administration in a switched network. Not much research has been pursued in addressing in-depth complexities of VTP. VTP encounters intricate situations first, when we try to insert a VTP client or server with higher config revision number and second, when we insert a switch with different VTP domain name. Solutions to both of these issues involve considerable manual re-configuration which transcends from manually changing VTP modes, domain names to manually adding missing or deleting un-wanted VLANs. Amount of manual configuration cited as obvious solution to these VTP problems increases exponentially for a mid-size scalable switched network and moreover this might also add to network downtime and subsequently to network management cost. This paper explores different options of eliminating manual configuration by comprehensively automating the applicability of proposed innovative solutions when VTP encounters above specified issues. An access list based VLAN map architecture is proposed for addressing the first issue. Modification in 802.1q frame is proposed to address the second concern of inserting switch with different VTP domain. Comprehensive analysis of simulated network is pursued to demonstrate the repercussions of VTP issues and finally, applicability of proposed architectures are introspected as viable way-out.