Re: [EFM] EFM-OAM frame fomat
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>