What are the correct Forwarding and Switching capacity of the switch S6720-50L-HI-48S?

Created: Jul 26, 2019 05:39:36Latest reply: Jul 29, 2019 09:20:49 188 3 1 1
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What are the correct Forwarding and Switching capacity of the switch  S6720-50L-HI-48S?8S?


Following the Datasheet the values are like below in an image:


181402sl77l9x559smjm0j.png?image.png

Is there another way to calculate this value different from the example below?


Example:


PACKETS: 84 bytes - MTU


As seen in figure below, a packet will occupy at least 84 bytes on the wire. So taking the example of a 1G port we first have to convert the speed into bytes:


1Gbps = 1,000,000,000 bits/s = (1,000,000,000 bits/s) / (8 bits/byte)= 125,000,000 bytes/s


Then we can calculate how many packets per second need to be processed if the port is to transmit at wire speed:


PPS = (125,000,000 bytes/s) / (84 bytes/packet) = 1,488,095 pps.


Similarly this same calculation can be extended to different port speeds:

 

182434sk0r4gv7v4buu97n.png?image.png

If we consider this example the Forwarding performance the switch S6720-50L-HI-48S will have another value:


Ports - S6720-50L-HI-48S: 48 x 10 Gig SFP+, 6 x 40 Gig QSFP+ or 44 x 10 Gig SFP+, 4 x 40 Gig QSFP+, 2 x 100 Gig QSFP28


> 44 x 10 Gig SFP+ = 44 x 14.880,952

> 4 x 40 Gig QSFP+ = 4 x 59.523,80

> 2 x 100 Gig QSFP28 = 2 x 148,809,524


The final Forwarding performance summing all Port Values is 1.190 MPPS.


Is it correct my calculation? or are there another way to calculate?





  • x
  • convention:

Featured Answers
Admin Created Jul 26, 2019 11:06:29 Helpful(1) Helpful(1)

Hello@daniellima
Formula: Maximum number of GE (GE) ports in full configuration *1.488+ Number of 100 Mbit/s ports in full configuration *0.1488 (Unit: Mpps)
  • x
  • convention:

All Answers
jason_hu Admin Created Jul 26, 2019 11:06:29 Helpful(1) Helpful(1)

Hello@daniellima
Formula: Maximum number of GE (GE) ports in full configuration *1.488+ Number of 100 Mbit/s ports in full configuration *0.1488 (Unit: Mpps)
  • x
  • convention:

umaryaqub MVE Created Jul 28, 2019 01:07:10 Helpful(0) Helpful(0)

Here is a general formula bto calculate, multiply ports with the highest speed available on switches and multiply it by 2 as ports speed in calculated in half-duplex and to make it full deuplex, we multiply it by 2

((48*10)+(6*40)+(100*2))*2 = 1840 gbps
This is the speed on SI image but to upgrade it as per the OS needs, additional switching performance is added depending on the EI or HI and it all depends on the new added programmable chips.
  • x
  • convention:

chenhui Admin Created Jul 29, 2019 09:20:49 Helpful(0) Helpful(0)

@daniellima Hi,
For some switch models, the switching capability and forwarding performance is based on the real ability of the switching chip, not the result based on the formula.

In addition, we usually use 1.5Mpps to calculate the forwarding permance, so that we could get an integer result.
  • x
  • convention:

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