Reposting what I sent earlier. Never saw it posted. One more tidbit: A link-state protocol runs the shortest path first (Dijkstra) algorithm. (EIGRP, on the other hand, develops a routing table using distance-vector info.)
For more info on the shortest path first algorithm, see this URL. Near the bottom, be sure to check out the animation. Very cool. http://ciips.ee.uwa.edu.au/~morris/Year2/PLDS210/dijkstra.html Priscilla At 06:42 PM 5/13/02, Rick wrote: >Priscilla, >I hate to differ with you on this Hybrid or not but the source says >it is considered a Hybrid routing Protocol. check the link for yourself >http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/en_igrp.htm Nope, the source is wrong too. I know Cisco likes to use that silly term and I suppose they can if they want to. But it's misleading. EIGRP does not have link-state behavior. Did you look up what that actually means on Google? You'll find lots of information on the actual computer-science meaning for the term. It's pretty cool. You have to remember that Cisco came out with EIGRP during a time of political/marketing battles about which was better, distance-vector versus link-state. That might explain their silly "hybrid" thing, but it's technically not accurate and the more advanced exams won't make you know it (hopefully)! >I myself am not a fan Lammle, but on this one he is right No, he's not. Although I know he is just quoting some Cisco material, so what can you expect? > and you are wrong >and YES I said you are wrong! Wouldn't be the first time, but I'm not wrong in this case. >EIGRP is as much Link-State as it is Distance >Vector. Nonsense. In what way is it link-state? Try to actually convince me! ;-) Priscilla >Rick > >""Priscilla Oppenheimer"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > At 04:13 PM 5/13/02, Mike Mandulak wrote: > > >Lammle refers to EIGRP as being a Hybrid of distance-vector and link >state. > > > > That's wrong. EIGRP is not link-state in any way. EIGRP calculates a flat > > routing table that lists networks, distance, and next hop (distance > > vectors). If the list contains multiple entries for a destination (because > > there are multiple ways to reach the destination), the entries are sorted > > by metric and the one with the lowest metric is selected. This is very > > different than how a link-state protocol functions. > > > > A link-state routing protocol creates a mathematical graph that depicts >the > > network. A link-state protocol implements a sophisticated process, called > > the Dijkstra algorithm, to determine the shortest path to all points in >the > > graph when the nodes and links in the graph are known. Link-state has a > > specific meaning to computer scientists. You'll find a lot of good stuff > > about it if you search with Google. A lot of it is not related to routing > > protocols. > > > > EIGRP does have some features that make it different from other > > distance-vector protocols. Although EIGRP still sends vectors with >distance > > information, the updates are non-periodic, partial, and bounded. > > Non-periodic means that updates are sent only when a metric changes rather > > than at regular intervals. Partial means that updates include only routes > > that have changed, not every entry in the routing table. Bounded means >that > > updates are sent only to affected routers. These behaviors mean that EIGRP > > uses very little bandwidth. > > > > EIGRP also determines a feasible successor, which other distance-vector > > protocols don't do. Its complex metric is also a feature not found in many > > other distance-vector algorithms, (except IGRP of course). > > > > Please do not send messages to me directly, especially not to quote Lammle > > CCNA fluff. > > > > Priscilla > > ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=44186&t=43994 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
