On 05/16/2011 09:15 AM, Kevin Gross wrote:
All the stand-alone switches I've looked at recently either do not support
802.3x or support it in the (desireable) manner described in the last
paragraph of the linked blog post. I don't believe Ethernet flow control is
a factor in current LANs. I'd be interested to know the specifics if anyone
sees it differently.
Heh. Plug wireshark into current off the shelf cheap consumer switches
intended for the home. You won't like what you see. And you have no
way to manage them. I was quite surprised last fall when doing my home
experiments to see 802.3 frames; I had been blissfully unaware of its
existence, and had to go read up on it as a result.
I don't think any of the enterprise switches are so brain damaged. So i
suspect it's mostly lurking to cause trouble in home and small office
environments, exactly where no-one will know what's going on.
- Jim
My understanding is that 802.1au, "lossless Ethernet", was designed
primarily to allow Fibre Channel to be carried over 10 GbE so that SAN and
LAN can share a common infrastructure in datacenters. I don't believe anyone
intends for it to be enabled for traffic classes carrying TCP.
Kevin Gross
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jim Gettys
Sent: Monday, May 16, 2011 5:24 AM
To: [email protected]
Subject: Re: [Bloat] Jumbo frames and LAN buffers
Not necessarily out of knowledge or desire (since it isn't usually
controllable in the small switches you buy for home). It can cause
trouble even in small environments as your house.
http://virtualthreads.blogspot.com/2006/02/beware-ethernet-flow-control.html
I know I'm at least three consumer switches deep, and it's not by choice.
- Jim
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