@online{ slideshare:vtpchap4,
    author = "Hector Camba Lainez",
    title = "Cap4 implementing vtp",
    year = "2010",
    url = {https://www.slideshare.net/lucky0679/cap4-implementing-vtp},
    note = "[Online; accessed 22-May-2017]"
}

@misc{ web:SP_Tiers,
   author = "Orhan Ergun",
   title = "{Tier 1,Tier 2 and Tier 3 Service Providers - Tier and BGP Peering} --- Orhanergun.net",
   year = "2017",
   howpublished = {\url{https://orhanergun.net/2017/01/tier-1-tier-2-tier-3-service-providers/}},
   note = "[Online; accessed 17-June-2017]"
}