This from Cisco:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/1216ea2/scg/swgp orts.htm
" receive on (or desired) and send on: Flow control operates in both directions; both the local and the remote devices can send pause frames to show link congestion.
receive on (or desired) and send desired: The port can receive pause frames and can send pause frames if the attached device supports flow control.
receive on (or desired) and send off: The port cannot send pause frames but can operate with an attached device that is required to or can send pause frames; the port can receive pause frames.
receive off and send on: The port sends pause frames if the remote device supports flow control but cannot receive pause frames from the remote device.
receive off and send desired: The port cannot receive pause frames but can send pause frames if the attached device supports flow control.
receive off and send off: Flow control does not operate in either direction. In case of congestion, no indication is given to the link partner, and no pause frames are sent or received by either device. "
Eff Norwood
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com]On Behalf Of nick.mayrath@webmd.net Sent: Tuesday, April 02, 2002 3:27 PM To: Eff Norwood Cc: kevin.noll@cgey.com; mlelstv@xlink.net; toasters@mathworks.com Subject: RE: FLOW CONTROL
What kind of benefit does setting 'receive' to 'desired' bring?
"Eff Norwood" <effrem.norwood@cyn To:mlelstv@xlink.net, "Noll, Kevin" kevin.noll@cgey.com aptic.com> cc: "'Toasters (E-mail)'" toasters@mathworks.com Sent by: Subject: RE: FLOW CONTROL owner-toasters@math
works.com 04/02/2002 02:14 PMBy default Cisco sets flow control to enable on the send side only. To enable flowcontrol in both directions as desired:
set port flowcontrol 2/1-12 send desired set port flowcontrol 2/1-12 receive desired
If you are going to make these kinds of changes to other switches in your network, do the far ends first so you don't get dropped.
Eff Norwood
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com]On Behalf Of Michael van Elst Sent: Tuesday, April 02, 2002 11:32 AM To: Noll, Kevin Cc: 'mlelstv@xlink.net'; 'Toasters (E-mail)' Subject: Re: FLOW CONTROL
On Tue, Apr 02, 2002 at 02:19:59PM +0100, Noll, Kevin wrote:
Sorry, are you refering to the desired and off, or are you
saying that it
should be enabled?
I am referring to the combination:
send desired receive off
Greetings, Michael van Elst
Thanks
-----Original Message----- From: Michael van Elst [mailto:mlelstv@xlink.net] Sent: 02 April 2002 14:21 To: Noll, Kevin Cc: 'Toasters (E-mail)' Subject: Re: FLOW CONTROL
On Tue, Apr 02, 2002 at 01:21:24PM +0100, Noll, Kevin wrote:
Hi All
We are standardized with Sun and Cisco equipment. All
equipment on our
Database Vlans are using Gig Ethernet. Flow control on our
sun servers
are
set to on. However, on our Cisco Switches, the settings are
as follows.
set port flowcontrol 2/1-12 send desired
set port flowcontrol 2/1-12 receive off
I am not a cisco engineer, but would like to know if this is
correct. I
believe it should be both on.
This is the configuration that was necessary on our site (and the same with IOS-based switches). It was also recommended by our local NetApp people.
I guess this makes it as 'correct' as possible.
Greetings,
i.A. Michael van Elst / phone: +49
721 9652 330
Xlink - Network Information Centre / fax: +49
721 9652 349
Emmy-Noether-Strasse 9 /\ link http://nic.xlink.net/ D-76131 Karlsruhe, Germany /_______ email:
hostmaster@xlink.net
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