RE: [EFM] EFM-OAM frame fomat
Geoff,
Would an editorial note help in capturing this rationale for
the benefit of readers and future developers?
DVJ
David V. James
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>> -----Original Message-----
>> From: owner-stds-802-3-efm@majordomo.ieee.org
>> [mailto:owner-stds-802-3-efm@majordomo.ieee.org]On Behalf Of Geoff
>> Thompson
>> Sent: Thursday, September 18, 2003 3:13 AM
>> To: Matt Squire
>> Cc: Alan Weissberger; Shahram Davari; stds-802-3-efm@ieee.org
>> Subject: Re: [EFM] EFM-OAM frame fomat
>>
>>
>>
>> Matt-
>>
>> I believe that you are incorrect.
>> The reason for the "Slow Protocol" being differentiated from the
>> original
>> MAC Control Frame used for "PAUSE" is that PAUSE Frames have to
>> be caught
>> in hardware, Slow Protocol frames are candidates for software handling.
>>
>> Geoff
>>
>>
>> At 07:27 PM 9/15/2003 -0400, Matt Squire wrote:
>>
>>
>> >Just to second Alan, the slow protocols cannot be LLC encapsulated or
>> >802.3Q encapsulated or anything else. They are a native
>> ethernet protocol
>> >with a single encapsulation intended for (some) potential processing in
>> >hardware.
>> >
>> >- Matt
>> >
>> >
>> >-----Original Message-----
>> >From: Alan Weissberger <ajwdct@technologist.com>
>> >Sent: Sep 15, 2003 1:33 PM
>> >To: Shahram Davari <Shahram_Davari@pmc-sierra.com>,
>> stds-802-3-efm@ieee.org
>> >Subject: Re: [EFM] EFM-OAM frame fomat
>> >
>> >
>> ><P>Shahram</P>
>> ><P>I don't believe an Ethernet OAM frame can be sent with LLC
>> >embedded. My understanding is that the Type field= Slow
>> protocol frame,
>> >which precludes carrying embedded LLC PDU. In other words, the
>> OAM PDU is
>> >self contained and there is no LLC or higher layer carried
>> within the user
>> >data field</P>
>> ><P>Hence, it is not possible to have the last 2 Ethernet frame formats
>> >carry an OAM frame:</P>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>-
>> 802.3 + LLC
>> >(802.2)</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>-
>> 802.3 + LLC
>> >+SNAP</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> >class=015465616-15092003>Rgds</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> >class=015465616-15092003>alan</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003><PRE>Alan
>> >Weissberger</PRE><PRE>DCT
>> >2013 Acacia Ct
>> >Santa Clara, CA 95050-3482
>> >1 408 863 6042 voice
>> >1 408 863 6099 fax</PRE></SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><P><BR><BR>----- Original Message -----<BR>From: Shahram Davari
>> ><SHAHRAM_DAVARI@PMC-SIERRA.COM><BR>Date: Mon, 15 Sep 2003 10:02:33
>> >-0700<<BR>To: stds-802-3-efm@ieee.org<BR>Subject: [EFM] EFM-OAM frame
>> >fomat<BR><BR></P>
>> ><META content="MSHTML 6.00.2800.1106" name=GENERATOR>
>> ><DIV><FONT face=Arial size=2><SPAN
>> >class=015465616-15092003>Hi,</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>As you know
>> >there are 4 Ethernet frame formats:</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>- Ethernet
>> >v2</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>-
>> >802.3</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>-
>> 802.3 + LLC
>> >(802.2)</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>-
>> 802.3 + LLC
>> >+SNAP</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>It
>> seems that
>> >the currently defined EFM-OAM frame format is based </SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN class=015465616-15092003>on Ethernet
>> >v2. What is the EFM-OAM frame format for other Ethernet
>> >frame</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> >class=015465616-15092003>types?</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> class=015465616-15092003></SPAN></FONT>
>> ></DIV>
>> ><DIV><FONT face=Arial size=2><SPAN
>> >class=015465616-15092003>Thanks,</SPAN></FONT></DIV>
>> ><DIV><FONT face=Arial><SPAN
>> class=015465616-15092003></SPAN></FONT><FONT
>> >face=Arial size=2><SPAN
>> class=015465616-15092003>-Shahram</SPAN></FONT></DIV>
>> ><DIV> </DIV><PRE> </PRE>
>> >
>> >
>>