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

[Christopher E. Brown]

In the datasheets for the 16XGE since release Juniper specifically called out 120G due to
bus limit with SCB.

Not in the sheet but actual is guaranteed 30G per bank of 4.

We used first 4 of each bank in heavy core use and behavior is as specified.

With change to SCBE this limit is removed and _all_ 16 ports are line rate capable at same
time.

The 30Gbit nominal (actual 31.7 or greater) limit per trio applies to the MPC1 and 2 cards
but the quad trio interconnect in the 16XGE is wired up diff with additional helpers and
can do the full 40G per bank.

There is no increase in usable capacity with the MPC1-3D and MPC2-3D cards with the SCBE
though, still 30G.


I did not have gear for a 16XGE full test, but after SCBE upgrade I did specifically test
at full duplex line rate on all 4 ports in a bank on one card to all 4 ports in a bank on
a second card in the same chassis.

On 1/14/2016 2:13 PM, Adam Vitkovsky wrote:
>> Christopher E. Brown
>> Sent: Thursday, January 14, 2016 10:20 PM
>> To: juniper-nsp at puck.nether.net
>> Subject: Re: [j-nsp] MX960 with 3 RE's?
>>
>>
>> It is 120Gbit agg in a SCB system as the limit is 120G/slot.
>>
>> This is in the form of 30Gbit per TRIO and 1 TRIO per 4 ports.
>>
>> So, use 3 of 4 in each bank if you want 100% line rate.
>>
>> SCBE increases this to 160Gbit or better (depending on age of chassis)
>> allowing for line rate on all 16.
>>
> So the 16XGE cards don’t have the limitation of max 38Gbps between Trio and Fabric please?
> 
> 
> adam
> 
> 
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>         IP Engineer
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Christopher E. Brown   <chris.brown at acsalaska.net>   desk (907) 550-8393
                                                     cell (907) 632-8492
IP Engineer - ACS
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