[j-nsp] MPC3E oversubscribe rate with two 10x10GE MICs

[louis.poncin at orange.com]

Nope. If you have enough "bandwidth" available you can use both 1x100G+2x10G mics linerate (same for 10x10G+20x1G). Yet what may make the difference is rather the packet size and pps. If you have a high rate of 64bytes packets you may encounter drops on the 1x100G mic. Yet I am not sure of this. This is what happens on MPC4E combo cards for the port 4x10G and 1x100G that share the same ASIC (See David Roy's web site "junosandme" for further explanations)


Envoyé depuis mon Radiocom 3000


-------- Message d'origine --------
De : Tom Storey <tom at snnap.net>
Date :
A : Olivier Benghozi <olivier.benghozi at wifirst.fr>
Cc : juniper-nsp at puck.nether.net
Objet : Re: [j-nsp] MPC3E oversubscribe rate with two 10x10GE MICs


As I understand it, it is still split 50/50% wise. Two active MIC slots
arbitrate equally for packet processing resources, regardless of how much
bandwidth they could potentially (or not) use. A 20x1G MIC will essentially
"waste" 40G of throughput. Yeah. :-/

On 5 December 2014 at 19:10, Olivier Benghozi <olivier.benghozi at wifirst.fr>
wrote:

> If you use one 10x10GE MIC and one 20x1GE, on the paper 120 Gb/s would
> mean no oversubscribing, but how the capacity will be really divided?
>
> > Tom Storey <tom at snnap.net> wrote :
> >
> > As was explained to me a while back, the MPC3E has ~120gbit of capacity.
> >
> > But the devil was in how that capcity is shared between the two MIC
> slots.
> >
> > When you have two active MICs that capacity is divided equally between
> the
> > two MICs: 50/50% or ~60/60gbps. It is NOT a case of operate one card at
> > full whack and only use a couple of ports on the other.
> >
> > If you plan to put in a second 10x10 MIC then you'll have to shuffle your
> > circuits around to balance them across the two MICs too.
> >
> > And if you need all wire speed ports then you need the 16x10G MPC3, and
> > only use 3 ports of each PIC.
> >
> > On 30 November 2014 at 23:22, Robert Hass <robhass at gmail.com> wrote:
> >
> >> Hi
> >> I'm currently using MPC3E with one 10x10GE MICs in my MX480 and MX960
> >> routers.
> >>
> >> I need to add 10GE ports, if I will put second 10x10GE MIC in existing
> >> MPC3E what will be oversubscribe rate ? I'm not sure but docs says about
> >> 200Gbps for MPC3E then It should be wire-speed if docs claims
> full-duplex
> >> or 1:2 if docs claims half-duplex.
> >>
> >> What is best solution (from price point of view) to have 16 x 10GE in 1
> >> slot on MX480/MX960 ? MPC3E + 10x10GE MICs or something different ?
>
>
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