Re: First step of network optimization

[Joe Shen]

Thanks for the response.

> 
> You want to optimize for the lowest monetary cost
> network that still allows you
> to meet all the SLA's you've negotiated.  And this
> depends on what you
> negotiated - for instance, if the SLA specifies 3
> 9's of reliability, spending
> money to build a 4 9's network is cutting into your
> profits.  Of course, if the
> SLA's are biased towards latency or bandwidth,
> you'll have to consider those.

There is always someone claims his network could reach
availability 99.9% or so, but I don't understand how a
network availability should be measured or figured
out. Is there any paper on this?

Focusing on SLA of a network, ISP network or PoP site
should not carry only one type of business traffic (
e.g. broadband access, MPLS-VPN, L2 VPN etc.), if we
consider it simply by taking network as a single
system optimization will surely be of no usage.

Looking at PoP site , is there any recommendation on
its design? a layer-2 access model is better than
router based system?

Joe



> 
> And remember that there usually isn't one right
> answer for anything but the
> most simple problems - almost always, some
> constraint will be placed on the
> solution. Often it's of the form "The salesdroid
> just promised XYZ", also known
> as the "Don't let your mouth write no check your
> router can't cash" syndrome.
> If it isn't that, it's a financial issue inside the
> company - there's always the
> network you *want* to build, which is almost never
> the network that your
> revenue stream will allow you to build....
> 
> 



		
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