Re: Broadcasting switches
From: Stuart Dunn (Stuart.Dunn@yacht_no@spam_interact.com.nospam)
Date: 04/19/03
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- In reply to: David H. Lipman: "Re: Broadcasting switches"
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From: "Stuart Dunn" <Stuart.Dunn@yacht_no@spam_interact.com.nospam> Date: Fri, 18 Apr 2003 23:06:42 +0100
"David H. Lipman" <DLipman~nospam~@Verizon.Net> wrote in message
news:PGmna.23896$Gb1.5305@nwrdny01.gnilink.net...
> Peter:
>
> Unless you use VLANs or Routers, all ports on switches are on the same
Broadcast
> domain.
> Switches break up collision domains to one collision domain per switched
port.
>
That wasn't the question he asked.
Several things to consider.
1. Have to disabled learn mode on the switches?
2. Are your Mac users using the finder a lot. That piece of crap broadcasts
like there is no tomorrow. I have personally seen 40 Macs bring a switched
network to its knees. I won't deal with them now unless they are on their
own subnet. Also older versions of the OS/hardware used to have problems
with ARP caching on Ethernet so that a few Macs could create broadcast
storms larger than 100's of PCs. Basically finder -> broadcasts. ARP cache
would overflow on the macs -> all would broadcast to replace needed
translations -> more broadcasts-> you get the idea. They could easaly
generate 1000+ broadcasts a sec when they got going. Appletalk is the
worst...
3. Use a protocol analyser to see what is actually being sent. An NIC may
have a problem and has become chatty.
4. You have a worm on your network and it is coping itself between all your
computers.
5. The guy who sold you your "switches" was good at ye old sticky label
trick :)
- Previous message: marky: "ISS Advisor Update"
- In reply to: David H. Lipman: "Re: Broadcasting switches"
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