Hi Jeongwoo,
It is not as simple as that. Do you want to use hardware suppression or
software? Hardware is base on % of bandwidth and software is base on per
packet. I personally prefer hardware as it will continue to forward unicast
traffic and block multicast/broadcast traffic. Hardware base is only
available on selected models (enterprise class). Software will shut down
the port if amount of multicast/broadcast traffic reach the threshold.
Another thing to remember is the router, most routing protocol use
multicast to pass information. If you set a low threshold, the link will
keep flapping.
Does the customer use streaming video, multimedia server or any other
application that use multicast? Have a look at all these before you
implement the suppression. Explain the impact to the customer. Ask the
customer the reason for enabling broadcast suppression. The customer may
have heard of it and don't realize what is does.
Albert
"jeongwoo park" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
>
> I have a customer who wished to enable broadcast
> suppression for a new network we're building.
>
> Generally I've never used it - I normally like to keep
> switch configurations as simple as possible. However I
> have no reason to tell him not to. It's a good
> feature, and broadcast suppresion is one of the
> reasons I recommend keeping VLANs smaller rather than
> bigger (where possible - lots of other things
> ocnsidered of course).
>
> However I am wondering what's a good limit. Years ago,
> it was said 100 broadcasts per second was a good value
> - this equates to about 12% of Ethernet if the
> broadcast are full length packets.
>
> These days things are a bit different with Pentium
> processors on hosts, and FastEthernet.
>
> I was thinking of simply setting all ports to 15% as
> the broadcast threshold, however if some ports are
> 100Meg and another 10Meg, then 15% of 100Meg will kill
> the 10Meg ports.
>
> Therefore I would be looking at seting 15% on 10Meg
> ports, and 1.5% on 100Meg ports.
>
>
> This is the sort of thing I wanted to avoid -
> differenting settings on different ports etc.
>
>
> Any advise - any horror stories I should perhaps know
> about.
>
> Thanks
>
>
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