>I'll have to disagree, and someone else please correct me if I'm >wrong. OSPF only understands intra-area, inter-area and external >route types. OSPF route preference is based upon route types and >within the same route type, costs. If there're equal cost routes >within the same route type, then load balance is automatic. Sure >you can look at same cost as hop counts. If I make the cost of two >paths to the same destination, say 100, you certainly can view that >as 100 hops. But load balance will happen.
If interface cost is set to 1, however, hop count becomes the path metric of the route. The routes will load-balance only if they are the same type (intra-area, inter-area, external type 1, or external type 2). >If there're no equal cost paths to the same destination, fast switch >will not put packets on the higher cost path, period. Correct. > >Tom > >>From: Hansang Bae >>Reply-To: Hansang Bae >>To: [EMAIL PROTECTED] >>Subject: Re: OSPF Load Balance >>Date: Sat, 17 Nov 2001 20:14:20 -0500 >> >>>>From: Hansang Bae >>>>I don't think you accomplished what you wanted to do. Setting all the >>>>costs to be the same causes OSPF to act like RIP. That is, the metric now >>>>becomes a hop count. So unless you have the same number of hops, it won't >>>>work. >>>>Even then, route-cache will cause per destination load-balancing. >> >> >>At 10:17 AM 11/17/2001 -0600, tom cheung wrote: >>>Correct me if I'm wrong. By default, OSPF load balances up to a max of 4 >>>equal cost, equal path-type routes. OSPF does not take into consideration >>>of hop counts. >> >> >> >>All correct. *Except*, that the original poster made all the interface >>costs to be the same. So basically, the metric acts just like hop counts. >>And while load balancing works across 4 links (w/o using maximum-paths), >>the route-cache (fast processing) makes the router use one link for a >>particular destination. This isn't unique to OSPF, it's just the way fast >>processing works (w/o using CEF etc.) >> >>hsb >_________________________________________________________________ >Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=26621&t=26621 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
