At 08:43 AM 8/19/99 -0700, you wrote:
>On Thu, 19 Aug 1999, Jeff Mcadams wrote:
>
>> While I basically agree with you...a few points to correct.
>>
>> Thus spake Harry McGregor
>> >out), and you get 50Mbytes/sec of useable bandwidth. That is
>> >400Mbits/sec, or almost the speed of 10 DS3 lines, or 4 100Mbit full
>> >duplex network cards.
>>
>> 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.
Dennis
>
>Yep, I was thinking that my original halving of bandwidth would account
>for it, but realized soon after posting that it would not
>
>esentialy this is what you have
>
>Incoming ======800Kbit/sec pipe========= outgoing
>outgoing ======same pipe================ incoming.
>
>Hopefully we will soon have some GOOD implimentations of PCI 64Bit, and
>even PCI 66MHz (requires 3.3v bus instead of the current 5v 33MHz).
>
>64bit @ 66MHz would be 528Mbytes/sec of bandwidth (again drop a bit for
>over head, and make it 500). That would give you 4Gbit/sec of bandwidth.
>
>I am not trying to say that LRP beats any CISCO product, but it does do
>very well for the lowerend (do not try to compair a 75K+ bit of hardware
>to a 1-3K PC!) routers from cisco, etc.
>
>Once the PC hardware gets to the point it should have been at 2 years ago,
>things will do much better.
>
>> >The cisco 7xxx series is mostly impliment in hardware (I think), and is
>> >not a "software" router.
>>
>> No, the 7xxx series is a "software" based router (ie, there aren't ASICs
>> doing the routing and switching), but it does (at least on the 75xx's)
>> use distributed processing. Meaning the RSP card (which is the main CPU
>> card) does the processing of routing protcol information, building a
>> routing table, building a forwarding table and all that (processing CLI
>> logins, etc.), but that large parts, or possibly (depending on the
>> configuration) all of the actual route selection and switching of the
>> packets can be offloaded to the Interface Processor cards (VIP cards).
>
>Thanks for the correction. What routers do you know of (under 250K) that
>use custom ASICs?
>
>
>> --
>> Jeff McAdams Email: [EMAIL PROTECTED]
>> Head Network Administrator Voice: (502) 966-3848
>> IgLou Internet Services (800) 436-4456
>>
>
> Harry
>
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