an IEEE standard that is implemented by multiple vendors and is functionally similar to CDP. Several other manufacturers, including Dell and Netgear have used the brand-neutral name Industry Standard Discovery Protocol (ISDP) to refer to their implementations of a CDP-compatible protocol. CDP was the abbreviation used by Cabletron who wrote the RFC 2641 for the discovery protocol. Cabletron's VlanHello Protocol Specification Version 4 See also CDP Spoofing References External links Breakdown and explanation of a CDP packet by Wireshark packet sniffer. cdp-tools FOSS GPL limited set of tools last updated 2007. Cisco Discovery Protocol Configuration Guide, Cisco IOS Release 15M&T CDP Cisco protocols Device discovery protocols