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Throughput calculation on MX

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  • 1.  Throughput calculation on MX

    Posted 07-04-2019 04:05
    Dear All, do you have an idea how the throughput is calculated for this platform cards? The values that are provided in datasheets are halfduplex or full duplex? Thanks in advance, Nicola


  • 2.  RE: Throughput calculation on MX
    Best Answer

     
    Posted 07-04-2019 04:13

    The throughput numbers are half-duplex. Eg. MX204's 400G throughput is 400G in one direction.

     

    Please be aware on MX240 and higher there can be fabric limiting scenarios where full capacity cannot be done between the MPCs. Please reach out if you need a more specific scenario analyzed.



  • 3.  RE: Throughput calculation on MX

     
    Posted 07-04-2019 04:15

    Hi Nicola,

     

    Throughput of the line card depends on the chipset it has thats how every different kind of line card has different capacity.

     

    Say if a card has capacity of 100Gbps then it can process 100 Gigabita of traffic per second, it can be ingress or egress traffic from the ports of this card, so yeah you can say that its half duplex.

     

    Hope it answers your questions, please let me know if you have any queries.

     

    Thanks



  • 4.  RE: Throughput calculation on MX

    Posted 07-04-2019 22:38

    Thank you guys for your answers,

     

    so if the same amount of traffic is received and transmitted at the same time by the same line card, and the throughput is 100 G, we could say that we process 50 G for each direction is'n it?

     

     



  • 5.  RE: Throughput calculation on MX

     
    Posted 07-04-2019 22:54

    Hi,

     

    Each card has multiple PFEs (0-3) so it depends on which PFE traffic is received for MX240 onwards series.

     

    There could be two scenarios:

     

    (1) say if traffic is received on PFE0 of the FPC 1 (ge-1/0/1) and egress is on PFE1 of FPC 1 (ge-1/1/1) then it will be going via fabric hence on MX240 and higher there can be fabric limiting scenarios where full capacity cannot be acheived.

     

    (2)  if ingress and egress ports are on the same line card say PFE0 of the FPC 1(ge-1/0/1) receives the traffic and egress is also PFE0 of FPC 1(ge-1/0/2) then yes it will be 50 Gig each because Fabric will not come into flow then.

     

    Thanks,

    Shina

     

     



  • 6.  RE: Throughput calculation on MX

    Posted 07-04-2019 23:13

    Thanks Shinam,

     

    your answer is what I was expecting!

     

    Thank you,

     

    Nicola



  • 7.  RE: Throughput calculation on MX

     
    Posted 07-04-2019 23:26

    Hi Nicola,

     

    Please notice that number of PFEs in a line card can be maximum four but it varies based on ASICs.

     

    some of the cards e.g MPC 3D 16&10GE  have 4 PFEs in one card however MPC2E has one PFE in the card.

     

    Number of  PFEs in a card can be checked w.r.t number of PICs you see in "show chassis fpc pic-status".

     

    Outputs for reference:

     

    MPC view.PNG

    Please let me know if you have any queries.

     

    Please Mark My Solution Accepted if it Helped. 

     

    Thanks,

    Shina