Here is one such loop scenario ;-) http://ccietobe.blogspot.com/2009/02/how-ospf-transmit-capability-can.html
On Mon, Jul 27, 2009 at 10:25 PM, Dale Shaw <[email protected]<dale.shaw%[email protected]> > wrote: > Hi, > > On Tue, Jul 28, 2009 at 1:43 PM, Taqdir > Singh<[email protected]> wrote: > > > > Could anyone please explain in **detail** how OSPF is loop free. I have > read > > somewhere OSPF even doesn't use Split horizon but its alogorithm makes > its > > loop free. > > If you /really/ want the details, you'll need to dig right into > Dijkstra's SPF algorithm and in terms of the implementation of the > algorithm in OSPF (generically and in IOS), the book "Routing TCP/IP > volume 1" (Jeff Doyle) covers it well. Aside from that, the OSPFv2 RFC > [1] may help illuminate things for you.[2] > > At 10,000 feet though, OSPF is loop free because every router in the > area runs the same algorithm across the same set of data, coming to > the same conclusion about the best way to reach a particular > destination. It's high improbable that permanent routing loops will > form, unless something else is going haywire in the network or a > device has been misconfigured (OSPF doesn't protect you against > yourself :-)) > > cheers, > Dale > > [1] http://www.ietf.org/rfc/rfc2328.txt > [2] I've never bothered to read it. > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
