Re: Looking for switch recommendations ...

From: Bakul Shah (bakul_at_BitBlocks.com)
Date: 03/26/04

  • Next message: Per Engelbrecht: "Re: Looking for switch recommendations ..." 
    To: "Marc G. Fournier" <scrappy@hub.org>
Date: Fri, 26 Mar 2004 11:08:47 -0800

    > What is the difference between Layer2 and Layer3, and what does that
    > affect?

    Layer3 == routing (based on IP destination address)
    Layer2 == switching (based on enet dest. address)

    Layer3 is probably not important for you.

    > HP:
    > Throughput: 2650 - 10.1 mpps (64-byte packets) 2626 - 6.6 mpps (64-byte packe
    > ts)
    > Switching capacity: 2650 - 13.6 Gbps 2626 - 9.6 Gbps
    >
    > Dell:
    > Switch Fabric Capacity 8.8 Gb/s
    > Forwarding Rate 6.5 Mpps
    >
    > So, in both cases, the HP is faster, but ... is that 6.6mpps "per port"
    > (ie. the pp?) ... right now, I'm seeing max of around 3Mps going out a
    > server, with average being well below 1 ... so I can't see hitting that
    > high any time soon ...

    For 100Mbps ports, the max packet rate in one direction is
    10^8/672 == 148809 pps (packets per sec) per port. So for 24
    port full duplex ports you get an aggregate maximum
    throughput of 148809*24*2 = 7738068 = 7.14Mpps (Million pps).
    For a 48 port switch it is 14.29Mpps.

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  • Next message: Per Engelbrecht: "Re: Looking for switch recommendations ..."

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