[j-nsp] Separate internet transit network versus converged

[Adam Vitkovsky]

> Saku Ytti [mailto:saku at ytti.fi]
> Sent: Monday, March 28, 2016 12:24 PM
>
> On 28 March 2016 at 13:32, Adam Vitkovsky
> <Adam.Vitkovsky at gamma.co.uk> wrote:
>
> > Public means exposed to whims of the wild Internet, that is in both data
> rates (DDoS) and updates (Malformed BGP updates) something you can't
> control.
> > Private means very good control over traffic rates and control plane
> > (number of updates,...)
>
> QoS should guarantee that Internet DDoS does not hurt L3 MPLS VPN. And
> BGP free core should guarantee that core does not core(SIC) on random BGP
> UPDATE.
>
Hey Saku,

Yes please, with BGP free core one usually relies on RRs and my point is that it's a good practice to run separate BGP process/RR (or at least sessions) for public control plane so malformed update that would god forbid cause iBGP session reset won't affect private control-plane sessions.

With regards to QOS,
In my opinion QOS is just a small piece in the puzzle (as a meter of fact it's not even the first thing that matters when a packet hits the box) and I think that one has to be well versed with how an ideal data-plane architecture looks like in order to be able to assess the HW capabilities and all the chokepoints across the chassis at hand correctly. Only then one can tell whether a particular HW fits the design requirements. There are cases were one doesn't need to bother but designing a converged network is not one of them.

That said, I'd like to encourage all folks on the list to get educated in how routers work, it's fun trust me. I find it striking how much we know about how control-plane works (SR, BGP, ISIS ...) but so little about a life of a packet through the data-plane, even though a great deal of info is available online (though don't expect any fancy certificates for knowing this stuff). Every time I ask a data-plane question on the list I get little relevant info and Saku is basically the only one whom I may discuss these topics with except the vendor folks.

adam











        Adam Vitkovsky
        IP Engineer

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E:      Adam.Vitkovsky at gamma.co.uk
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