>in OSPF, each router has a link state database so it knows of all >paths and doesnt have the need for split horizon > >At 06:40 AM 5/10/2002 +0900, Jenkins, Buddy wrote: >>Read Doyle Chapter 11. Read the questions at the end of the >>chapter. RIP/IGRP use split horizon. OSPF does not. That is the >>only documented explanation I can find. Instead of saying "I >>think" or "I guess" can someone come up with some more documented >>references for this type of redistribution behavior. >> >>Buddy
Alex Zinin's _Cisco IP Routing_. Addison-Wesley, ISBN 0201604736; Reading the RIP RFC itself gives the best description I know of split horizon within a protocol. As I posted earlier, to understand what is going on in redistribution "split horizon" is the imposition of the logical effect of split horizon BETWEEN protocols, not the split horizon effect OF a specific protocol. There's a redistribution tutorial by Ron Trunk at CertificationZone, available to members. You can also get some insight by reading about Routing Policy Specification Language and related things (www.radb.net). This is much deeper, and is more concerned with exterior routing, but understanding how you specify what is properly called "importing" and "exporting" routing information among sources is something I found very helpful. "Redistribution" itself is an awkward word that more or less means importing, but it's not as precise as describing the abstract routing protocol behavior with respect to export and import policy, and the scope of propagation of routing information. -- "What Problem are you trying to solve?" ***send Cisco questions to the list, so all can benefit -- not directly to me*** ******************************************************************************** Howard C. Berkowitz [EMAIL PROTECTED] Chief Technology Officer, GettLab/Gett Communications http://www.gettlabs.com Technical Director, CertificationZone.com http://www.certificationzone.com "retired" Certified Cisco Systems Instructor (CID) #93005 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=43794&t=43794 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
