Thus spake Dennis
>>> Try 2. 100Mbps full duplex fast ethernet card is dealing with 200Mbps
>>> of data total.
>HSSI/T3 is 88Mb/s (full duplex)...but a HSSI card is pretty useless without
>an ethernet. We think that 2 HSSIs and 2 Ethernets is about all you can
>safely use. Remember that each routed packet requires 2 bus transfers, so
>you have to double the bus utilization. If you dont have any
>ethernet-ethernet traffic it makes things more workable.
Well...but I was accounting for that...since I was considering full
duplex for each fast ethernet card (same would go for hssi, or t1 cards,
or whatever)...the packet hits the bus on the way in from the card, and
then hits the bus again on the way out the other card...so the full
duplex figure I was quoting up there accounts for that. So you might be
just a bit over conservative there. I'd rather be over conservative in
this type of thing than oversell what the box could do though. :) That
does, however, illuminate one of the advantages of the cisco type
boxes...they only hit the PCI bus (or whatever bus they use...many are
PCI based) only once typically in switching a packet since in most
situations, the packet is read directly from the incoming interface's
packet buffer onto the outgoing interface.
--
Jeff McAdams Email: [EMAIL PROTECTED]
Head Network Administrator Voice: (502) 966-3848
IgLou Internet Services (800) 436-4456
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