In the paper below we give an example that shows that regardless of the
weights you assign to links in OSPF the possible gap between MPLS TE capabilities
and OSPF which equally splits the traffic among multiple paths in as high
as can be.
In other words, weight setting for OSPF cannot replace MPLS as
a traffic engineering tool.
Yuval
http://www.eng.tau.ac.il/~shavitt/pub/DIMACS01-17.ps
>
> Our work is basically a theoretical result with an attemp to find some
> practical applications.
> I agree that it is too early to say how ready or how ususful it can be for
> real world networks.
> I am aware of some of its limitations. One of them is that it sometimes
> needs to split traffic
> unequally between two or more equal weight shortest paths in order to
> achieve the optimal
> traffic engineering which is doable by MPLS (uneqal split between two LSPs
> between the same
> source-destination) but for some reason difficult to do by OSPF at present
> time. Another is that
> we may be able to set appropriate link weights to optimize the long term
> network performance in the
> statistical sense, but we don't want to change link weights dynamically
> reacting to traffic
> fluctuations in real time. I welcome critics or sugegstions to make it more
> practical.
>
-- Yuval Shavitt Dept. of Electrical Engineering - Systems Tel Aviv University, Tel Aviv 69978, Israel Tel: +972 3 640 8659 Fax: +972 3 640 7095 URL: http://www.eng.tau.ac.il/~shavittNetworking Research Center, Bell Labs, Lucent Technologies Holmdel, NJ 07733 URL: http://www.cs.bell-labs.com/~shavitt
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