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NCAB VTP presentation

NCAB VTP presentation. Jeff Custard NCAR Network Engineering and Telecommunications Section. What is VTP?. VLAN-Virtual Local Area Network VTP-VLAN Trunking Protocol A protocol Cisco created to maintain VLAN configuration consistency throughout the network. What does NETS do now?.

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NCAB VTP presentation

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  1. NCAB VTP presentation Jeff Custard NCAR Network Engineering and Telecommunications Section

  2. What is VTP? • VLAN-Virtual Local Area Network • VTP-VLAN Trunking Protocol • A protocol Cisco created to maintain VLAN configuration consistency throughout the network

  3. What does NETS do now? • We currently do NOT implement VTP • Manual entry for each added VLAN • The “edge switch” where the port needed the particular VLAN is • Plus each of the “core switches” • Relies heavily on “manual entry consistency”

  4. Why are we looking at VTP? • VLAN configuration consistency • Accurate VLAN tracking and monitoring • Dynamic reporting of added VLANs • “Plug-and-play” configuration when adding new VLANs

  5. Why haven’t we used VTP before? • Potential for distribution of “bad” network information • Configuration database has a revision number that is notification+1 (N+1) • A higher CRN indicates more current VLAN information • A higher CRN causes the stored VLAN information to be overwritten with the new info from the VTP update

  6. VTP Operation • “VTP Domain” defines VTP boundaries • Each switch advertises the following on its trunk ports: • Management domain • Configuration revision number (CRN) • Known VLANs and their specific parameters

  7. VTP Modes of operation • Server • Client • Transparent

  8. VTP Pruning • Reduces unnecessary flooded traffic • Broadcast; Multicast; Unknown; Flooded unicast packets • Doesn’t change STP characteristics • Increases available bandwidth by restricting flooded traffic to only trunk links that must carry it • Enabling VTP pruning allows pruning for the entire management domain

  9. Flooded traffic WITHOUT VTP Pruning

  10. Flooded traffic WITH VTP Pruning

  11. For more information • Cisco Press book "Building Cisco Multilayer Switched Networks" by Karen Webb • These Cisco web pages: • Understanding and Configuring VLAN Trunk Protocol (VTP) • Configuring VTP

  12. Questions?

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