Re: Bottlenecks and link upgrades

[Etienne-Victor Depasquale <edepa () ieee org>]

+1

You can't foresee everything, but no plan means foreseeing nothing, =
blindfold.

Cheers,

Etienne

On Sat, Aug 15, 2020 at 12:29 PM Radu-Adrian Feurdean <
nanog () radu-adrian feurdean net> wrote:

> On Sat, Aug 15, 2020, at 11:35, Baldur Norddahl wrote:
> > No plan survives contact with the enemy. Your careful made growth
> > projection was fine until the brass made a deal with some major
> > customer, which caused a traffic spike.
>
> Capacity planning also includes keeping an eye on what is being sold and
> what is being prepared.
> Having the traffic more than double within a 48h timespan (until day X
> peak at N Gbps, after days X+2, peaks at 2.5*N Gbps) -> done with success
> when the correct information ("partner X will change delivery system")
> arrived 4 months in advance.
>
> Having multiple 200 Mbps and 500 Mbps connections over an already-used 1
> Gbps port and pretending that "everything's gonna be allright" , in that
> case you should confront your enemy.
>
> > Or any infinite other events that could and eventually will happen to
> you.
>
> Among which you try to protect yourself against the most realistic ones.
>
> > One hard thing, that almost everyone will get wrong at some point, is
> > simulating load in the event multiple outages takes some links out,
> > causing excessive traffic to reroute unto links that previously seemed
> > fine.
>
> You should scale the network to absorb a certain degree of
> "surprise"/damage, and clearly explain that beyond that certain level,
> service will be degraded (or even absent) and there is nothing that can and
> nothing that will be done immediately.
>
> Every network fails at a certain moment in time. You just need to make
> sure you know how to make it working again, within a reasonable time frame.
> Or have a good run-away plan (sometimes this is the best solution).


-- 
Ing. Etienne-Victor Depasquale
Assistant Lecturer
Department of Communications & Computer Engineering
Faculty of Information & Communication Technology
University of Malta
Web. https://www.um.edu.mt/profile/etiennedepasquale