Re: autonegotiation protocol

This is actually what I was referring to. It only makes mention of
10GBASE-T (10G over copper) which as far as I know doesn't (or barely)
exist yet. This is to allow the copper nic's to negotiate down to a
different speed. There is still no auto-neg for 10GBASE-R (the only
widespread implementation) and 1G-BASE-SX/LX.

10GBASE-T makes extensive use of the management functions provided by the
MII Management Interface (see
22.2.4), and the communication and self-configuration functions provided
by Auto-Negotiation (Clause 28.)

55.X.1 Support for Auto-Negotiation
All 10GBASE-T PHYs shall provide support for Auto-Negotiation (Clause 28)
and shall be capable of operating as
MASTER or SLAVE.
Auto-Negotiation is performed as part of the initial set-up of the link,
and allows the PHYs at each end to advertise
their capabilities (speed, PHY type, half or full duplex) and to
automatically select the operating mode for
communication on the link. Auto-negotiation signaling is used for the
following two primary purposes for
10GBASE-T:
a) To negotiate that the PHY is capable of supporting 10GBASE-T
transmission.
b) To determine the MASTER-SLAVE relationship between the PHYs at each end
of the link. This relationship is
necessary for establishing the timing control of each PHY. The 10GBASE-T
MASTER PHY is clocked from a local
source. The SLAVE PHY uses loop timing where the clock is recovered from
the received data stream.

Keegan Holley b* Jr. Network Architect b* SunGard Availability Services
b* 401 North Broad St. Philadelphia, PA 19108 b* (215) 446-1242 b*
keegan.holley_at_sungard.com Keeping People and Information ConnectedB. b*
http://www.availability.sungard.com/
 
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From:
Steve Di Bias <sdibias_at_pacbell.net>
To:
David Prall <dcp_at_dcptech.com>, Keegan.Holley_at_sungard.com, Cisco Fanatic
<ebay_products_at_hotmail.com>
Cc:
ccielab_at_groupstudy.com, nobody_at_groupstudy.com
Date:
12/27/2009 10:56 AM
Subject:
Re: autonegotiation protocol
Sent by:
<nobody_at_groupstudy.com>

For 10GBASE-T this is true per the auto-negotiation clause 28 - good stuff
to read if you need some sleep!

http://www.ieee802.org/3/an/public/jul04/lynskey_2_0704.pdf

________________________________
From: David Prall <dcp_at_dcptech.com>
To: Keegan.Holley_at_sungard.com; Cisco Fanatic <ebay_products_at_hotmail.com>
Cc: ccielab_at_groupstudy.com; nobody_at_groupstudy.com
Sent: Sat, December 26, 2009 2:42:15 PM
Subject: RE: autonegotiation protocol

Actually there is negotiation done during link up status with both GE and
10GE Fiber connections. It can be disabled but isn't recommended. This is
per the IEEE 802.3z (1000 Mbps) standard of negotiating with its remote
partner to establish a network connection.

Here's an article on 10/100/1000 auto-negotiation which is completely
different:
http://www.ethermanage.com/ethernet/pdf/dell-auto-neg.pdf

--
http://dcp.dcptech.com
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Keegan.Holley_at_sungard.com
> Sent: Saturday, December 26, 2009 5:08 PM
> To: Cisco Fanatic
> Cc: ccielab_at_groupstudy.com; nobody_at_groupstudy.com
> Subject: Re: autonegotiation protocol
> 
> There's nothing to negotiate.  There is no such thing as a
> 10/100/1000/10000 interface or a 10GE interface capable of anything
> else
> but 10G and there is no half duplex 10G or even 1G.  It may make an
> appearance whenever 10G over copper becomes commonplace. possibly..
> 
> 
> 
> 
> From:
> Cisco Fanatic <ebay_products_at_hotmail.com>
> To:
> <ccielab_at_groupstudy.com>
> Date:
> 12/23/2009 07:57 PM
> Subject:
> autonegotiation protocol
> Sent by:
> <nobody_at_groupstudy.com>
> 
> 
> 
> All,
> 
> Is autonegotiation protocol supported on 10GE? I know it is supported
> on
> 10/100/1000 MB, but not sure on 10GE?
> 
> Can
> someone please conform?
> 
> -Yuri
> 
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