[j-nsp] Rate selectability on MPC7E-MRATE

[Vincentz Petzholtz]

Hi Tobias,

Clearly our last beer together happened too long ago ;-)
I haven’t referred to the kb article or anything … I just wanted to mention that you can use 100G and 40G ports on the same pic
as long as you don’t go above 240G per pic. Of course setting $whatever to 100G only will not work.

But this
set chassis fpc 1 pic 0 port 0 speed 40g
set chassis fpc 1 pic 0 port 2 speed 100g
set chassis fpc 1 pic 0 port 5 speed 100g
set chassis fpc 1 pic 1 port 0 speed 40g
set chassis fpc 1 pic 1 port 2 speed 100g
set chassis fpc 1 pic 1 port 5 speed 100g
works fine.

Just my 2 cents.

Best regards,
Vincentz

> Am 06.05.2020 um 20:40 schrieb Tobias Heister <lists at tobias-heister.de>:
> 
> Hi,
> 
> On 06.05.2020 20:15, Vincentz Petzholtz wrote:
>> That’s not true and you sad it yourself. You have 240G per PIC.
>> With 2x100G ports enabled you can still set one remaining port to 40G on the same pic.
>> And it also works just fine.
> 
> Which part of my last mail is not true? Maybe i did not make myself clear enough?
> 
> If you configure the PIC in per port mode/level, you can different modes per port and hence have 2x100GE and 1x40/4x10GE on the same PIC. See the first part of my last mail.
> https://www.juniper.net/documentation/en_US/junos/topics/topic-map/rate-selectability-configuring.html#id-configuring-rate-selectability-at-port-level
> 
> If you configure the PIC in PIC speed mode/level 100GE you will only have 2x100GE and nothing else per pic, as described in the second part of my last mail
> https://www.juniper.net/documentation/en_US/junos/topics/topic-map/rate-selectability-configuring.html#id-configuring-rate-selectability-at-pic-level
> 
> The later could make sense if you use e.g. SCBE2 and want 2+1/1+1 mode and not 3+0/2+0 to reduce the level of card to fabric/slot "oversub"as you only get up to 480G per Slot on that SCBE2 if all boards are active at the same time.
> 
> --
> Kind Regards
> Tobias Heister

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