At 03:54 PM 3/7/2003 +0000, The Long and Winding Road wrote: >""Peter van Oene"" wrote in message >news:[EMAIL PROTECTED] > > At 12:11 PM 3/7/2003 +0000, Johan Bornman wrote: > > >Is EIGRP a Hybrid or Distance Vector protocol? > > > > Cisco calls it Hybrid. It looks pretty distance vector to me though. > >in what way? the hop count is pretty well hidden in the dark interior of the >code. all those cost numbers, the ( also somewhat hidden ) topology table, >and the ( somewaht hidden ) successor table certainly give it the appearance >of link state.
In a link state algorithm, a router builds a complete topology table for the bounded area in which it operates and then uses a spanning tree like algorithm (dijkstra in most cases) to calculate loop free paths. EIGRP simply does not do this. Primary and secondary paths in EIGRP are calculated based upon indirect information relayed by direct neighbors only using an advanced distance vector algorithm (DUAL). I think Cisco likes to call it Hybrid since many folks feel distance vector routing is inferior to link state and thus by labelling EIGRP as the best of both approaches, Cisco has put a positive spin on the protocol. This is typical marketing garbage from one of the best spin companies on the planet (in a neck and neck race with Microsoft and Harley Davidson for that matter) Pete >Chuck >who considers all this stuff a kind of magic > > > > >A hello mechanism and adjacencies does not a link state one make. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=64732&t=64707 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
