VTP Crib Notes

These are my ‘crib notes’ that I’ve made to serve as a last minute refresher. Please forgive the grammer / spelling as I did not develop these notes with publishing in mind.


*** Theory ***

  • VTP Domain – Switch can be in 1 domain only. All switches in that domain participate in VTP (case sensitive),
  • VTP Mode
    • Server – can create, delete, modify etc (default)
    • Client – Listen to VTP Advertisement
    • Transparent – Locally significant. Does not save only passes VTP advertisements
    • VTP Version for Transparent mode
      • V1 – Will forward VTP ad only if domain and version number is same as downstream
      • V2 – will forward VTP add over it trunk port regardless of domain name. Supports token ring vlan and switching
      • VTP Advertisements: are multicasts, sent over trunk ports only. Every server change increases the revision by 1. Switch ignores VTP advertisement with lower rev number than itself. Sent after every change and summary sent every 5 minutes
      • VTP Password – case password put in secure mode. Visible. Used to protect from intruder switch as some switches can pull the domain name from null status
      • New switches – Make sure it rev is 0, otherwise if it the highest, all switch will use this vlan database even if new sw is client or server!
      • Reset revision number – Change switch to transparent and back to server or change domain to a non existant name then back to the original
      • Clients – If VLAN database becomes corrupt, it sends client advertisement request. VTP server responds with summary and subsets
      • VTP Pruning – confines broadcast (&multicast treated as broadcast) over trunk ports as trunks are members of all vlans. If SW1 has vlan ports 2-11 and SW2 has vlan 10-19, they have 10 and 11 in common. No point switches receiving broadcasts for vlan members they do not have. Enable this on VTP server only
      • Vlan.dat – delete this IN FLASH  with write erase otherwise it wont delete it as it not in NVRAM

*** Commands ***

  • Show VTP status: Version, revision, no. Of vlans, operating mode

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