The MPLS WG Archive

[Jing Shen <jshen@cad.zju.edu.cn>]

>   What I don't agree - "Just because MPLS is connection oriented
>   and simple/fast label lookup doesn't mean that we shouldn't do
>   load balancing. There is no requirement that we must do
>   load balancing using constraint based routing".
> 
>   You can do load balancing using plain old IP routing and signaling
>   protocols which uses that routing (like LDP).
> 

Although someone has presented that by optimizing path weight load
balancing across
ISP network could be achieved, its ability is limited by its
prerequirement of determining
traffic matrix before computing. As network usage increase
exponentially, such method 
has the drawback of computing load. That is why I think we should find
new way to
do with TE requirement. LDP using shortest-path first algorithm could
not solve
the problem, while CR-LDP with source routing could be a solution but
perhaps multipath
routing is the best one. 

But, there has not been much research done with multipath routing esp.
under the 
situation of self-similar traffic load, and how to provide monitoring
and debugging
ability in multipath routing system is another open problem. 




>   Are you expecting that all connection-oriented protocols must
>   assure ordered delivery ? In the interest of end-to-end Internet
>   design, I expect all transport/session layer protocols will take
>   care of ordered delivery of packets to applications.
> 

Although it has been showed that out-of-order has little effect on e2e
performance, high-speed access speed will enlarge that effect when 
more and more UDP based application is employed in current network which 
is the trends of current multimedia application. So, I think the to
avoid such
problem, stream based load balancing should be preferred. 



-- 
Jing Shen



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