Re: [j-nsp] Enhanced MX480 Midplane?

[Tobias Heister]

Hi,

Am 15.11.2017 um 09:13 schrieb Sebastian Becker:

that’s not right. You need to differ between redundancy and non-redundancy-mode:

With Fabric Redundancy in MX960 (SCBEs: 2 active, 1 spare):

Premium2 Chassis (non-enhanced midplane):
MPC5E205G
MPC7E400G

Premium3 Chassis (enhanced midplane):
MPC5E240G
MPC7E480G

In the non-redundant mode (so all three SCBEs are online and active) you will 
not suffer from any limitation as long as all three are online. But if one dies 
you will have the limitations in a Premium2 chassis. So it depends on the model 
you want to use. We need a full redundant switching fabric so we have to 
calculate with these limitations.


At least according to my information there is no difference in enhanced/non 
enhanced for MPC7 on SCBE2 in any MX.
There is no way to get full 480G with 2+1 with SCBE2. You can get 480 in 3+0 
mode. (both on MX960)

The first SCB* with 2+1 and Linerate for MPC7 will be SCBE3.

But hey, your version would make more sense but all my documents and 
information since the release of MPC7 say otherwise.
On the other hand there are not many customers in DE who would/should know 
better :)

--
Kind Regards
Tobias Heister
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Re: [j-nsp] Enhanced MX480 Midplane?

[Sebastian Becker]

Hi Tobias,

that’s not right. You need to differ between redundancy and non-redundancy-mode:

With Fabric Redundancy in MX960 (SCBEs: 2 active, 1 spare):

Premium2 Chassis (non-enhanced midplane):
MPC5E   205G
MPC7E   400G

Premium3 Chassis (enhanced midplane):
MPC5E   240G
MPC7E   480G

In the non-redundant mode (so all three SCBEs are online and active) you will 
not suffer from any limitation as long as all three are online. But if one dies 
you will have the limitations in a Premium2 chassis. So it depends on the model 
you want to use. We need a full redundant switching fabric so we have to 
calculate with these limitations.

— 
Sebastian Becker

> Am 14.11.2017 um 23:35 schrieb Tobias Heister :
> 
> 
> Hi,
> 
> Am 14.11.2017 um 13:27 schrieb Sebastian Becker:
>> The enhanced midplane allows you already to use higher bandwidth with 
>> redundancy at least on the MX960. 205G per slot (not > enhanced) against 
>> 240G per slot (enhanced) So if you want to use a MPC5E-100G10G and populate 
>> every port (2x100G plus 4x10G) > you need the enhanced midplane and the 
>> SCBE2. Same for the MPC5E-40G10G and the Q-Versions of these cards. 
>> Otherwise you > overbook the midplane.
> 
> Funny enough the MPC7 has no reduced Bandwidth with the non enhanced 
> Midplane, so for now only MPC4/5 suffer from that old midplane. I always 
> wondered why that is the case. Might be a combination of PFE/Trio Generation 
> and frequency/speed per Serdes to Fabric connectivity. If somebody knows the 
> details i am eager to know.
> 
> We will see what SCBE3 might bring there (other than allowing us to run MPC7 
> at full speed with redundancy and pave the way for future MPC)
> 
> -- 
> Kind Regards
> Tobias Heister
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