Greater than 30% Ethernet Utilization no longer means slow network???

It has been said that Ethernet networks start becoming inefficient once
network traffic goes above 30% network utilization. I explained this to my
manager while looking for potential bottlenecks on some servers and he
replied that we run a fully-switched and routed Ethernet network with all
network cards in the servers, switches and routers running at 100mbs/Full
duplex, so that can't be the issue. He said if the network cards were set
at half-duplex he'd agree with me.

Gurus, what are your thoughts?

Unlike hubs, switches both pause and map packets before retransmitting them
to the next hop, which effectively eliminates collisions, which are likely
where the Ethernet 30% limitation idea comes from.

I'm not a guru and you probably know more about this than me,
Jon


"Spin" <(E-Mail Removed)> wrote in message
news:c5k8tb$2mmeh$(E-Mail Removed)...
> It has been said that Ethernet networks start becoming inefficient once
> network traffic goes above 30% network utilization. I explained this to
my
> manager while looking for potential bottlenecks on some servers and he
> replied that we run a fully-switched and routed Ethernet network with all
> network cards in the servers, switches and routers running at 100mbs/Full
> duplex, so that can't be the issue. He said if the network cards were set
> at half-duplex he'd agree with me.
>
> Gurus, what are your thoughts?
>
>

I think you can get a bit over 50% with that setup before you notice
anything. I'm not sure at what % it really starrts to get bad. It also
varied with how well it is segmented to keep down broadcasts.

So your manager is probably accuarte.

--

Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com


"Spin" <(E-Mail Removed)> wrote in message
news:c5k8tb$2mmeh$(E-Mail Removed)...
> It has been said that Ethernet networks start becoming inefficient once
> network traffic goes above 30% network utilization. I explained this to
my
> manager while looking for potential bottlenecks on some servers and he
> replied that we run a fully-switched and routed Ethernet network with all
> network cards in the servers, switches and routers running at 100mbs/Full
> duplex, so that can't be the issue. He said if the network cards were set
> at half-duplex he'd agree with me.
>
> Gurus, what are your thoughts?
>
>