It is an OSPF design principle. Essentially, current-generation routing protocols (i.e., without traffic engineering) are incapable of doing other than hop-by-hop load sharing, which may lead to extremely poor end-to-end utilization.
The IETF consensus is that when you need to optimize utilization, conserve resources, etc., you need traffic engineering. Routing is intended for topology discovery rather than traffic optimization. In other words, I consider, and I think most routing authorities would agree, that the unequal cost load balancing of IGRP and EIGRP really is a blind alley in protocol development. >You can read RFC 2328 or John T Moy's OSPF Anatomy of a Routing Protocol to >find that answer. I'll dig through them and see if I can find you an answer >if no one else comes up with one sooner. > >HTH, >Chris > >-----Original Message----- >From: Cisco Breaker [mailto:[EMAIL PROTECTED]] >Sent: Monday, November 26, 2001 10:08 AM >To: [EMAIL PROTECTED] >Subject: Re: OSPF Unequal load balancing? [7:27311] > > >As I said before I implemented equal load balancing on Motorola and Cisco >what I want to know is, Is it possible to configure OSPF unequal load >balancing ? You are saying that OSPF unequal load balancing can not be done >on cisco I know that. The reason why I asked the question is cause I know >that cisco can not do but is it the OSPF behaviour not to implement unequal >load balancing or is it belong to Cisco's OSPF implementation? >My guess is OSPF. > >Best regards, > > >""Ralph Fudamak"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> I don't know how Motorola implements OSPF, but with Cisco's >> implementation you can not do unequal cost load balancing with OSPF. This >> is not to say that you can't manually change the metrics on the links to >> appear to be equal cost. Keep in mind that this load balancing is *equal* >> then. Your slow link will get as much traffic as your fast one, which >could >> cause a bottleneck. See if there is some command to set a default cost on >> the link, then set them both the same. >> >> Hope this helps >> >> ""Cisco Breaker"" wrote in message >> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> > I implemented OSPF load balancing but never done unequal load balancing. >> My >> > customer wants Unequal loadbalancing on Motorola routers. As I know >> Unequal >> > load balancing cant be implemented on Cisco without policy-map? Any >> > suggestions or any info? >> > >> > Best regards, Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=27347&t=27311 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
