[j-nsp] MX960 with 3 RE's?

[Kevin Wormington]

So what are any bandwidth limitations of an all DPCE-R system with original SCB?

Thanks,

Kevin


> On Jan 15, 2016, at 6:59 AM, Christopher E. Brown <chris.brown at acsalaska.net> wrote:
> 
> 
> The MPC2-Q is an advanced per unit queueing card and has QX, it also
> runs against the lower/original fabric rate.
> 
> The 16XGE rate is a port mode card with no QX, and it supports the first
> of the fabric speed increases.
> 
> The published capacity of the MPC2-Q is 30G per MIC with a supplied by
> Juniper actual worst-case figure of 31.7G, climbing to about 39G with
> larger frames.
> 
> This matches with my own test results and it does not change with SCB model.
> 
> 
> On 1/15/16 03:47, Adam Vitkovsky wrote:
>>> From: Saku Ytti [mailto:saku at ytti.fi]
>>> Sent: Friday, January 15, 2016 10:18 AM
>>> On 15 January 2016 at 03:13, Christopher E. Brown
>>> <chris.brown at acsalaska.net> wrote:
>>>> When the same folks were asked about the 16XGE card and the 120G (and
>>>> later 160G) performance it was indicated that there was an additional
>>>> layer of logic/asics used to tie all 4 trios in the 16XGE to the bus
>>>> and that these ASICs offloaded some of the bus related overhead
>>>> handling from the TRIOs, freeing up enough capacity to allow each TRIO in
>>> the 16XGE to provide a full 40G duplex after jcell/etc overhead.
>>> 
>>> 
>>> Sorry Christopher for being suspicious, but I think you must have done some
>>> mistake in your testing.
>>> 
>>> Only difference that I can think of, on top of the multicast replication, is that
>>> 16XGE does not have TCAM. But that does not matter, as the TCAM isn't
>>> used for anything in MPC1/MPC2, it's just sitting there.
>>> MPC1/MPC2 can be bought without QX. You specifically metnion '3D-Q'.
>>> If you were testing with QX enabled, then it's wholly different thing.
>>> QX was never dimensioned to push all traffic in every port via QX, it's very
>>> very much underdimensioned for this. If MQ can do maybe ~70Gbps
>>> memory BW, QX can't do anywhere near 40Gbps. So if you enable QX or
>>> ingress+egress, you're gonna have very very limited performance.
>>> 
>> Saku is right, if you do the math then 40.960Gbps is a theoretical maximum for QX as a whole.
>> 
>> adam
>> 
>> 
>> 
>>        Adam Vitkovsky
>>        IP Engineer
>> 
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> 
> 
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