<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.E-MailFormatvorlage17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi list,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>i have three SAS-R6/R12 connect thru 10G links WAN, mpls, ospf. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I just configured one epipe <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>from location A, 1G port as access-SAP, default MTU 1514 ,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>to location B, 1G port as access-dotq-SAP therefore MTU 1518,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Service-mtu 1514. Everything looks good.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>But after some time, we realized a paket-lost of 20-25%.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Looking at the counters (after synchronized “clear” commands),<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>We can see that the packet count of the SDP on device B incoming<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is equal to the packet count of SDP in device A outgoing <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is equal to the packet count of SAP/PORT on device A incoming.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>But the packet Count of SAP/PORT on device B outgoing reflects the loss.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>We can not find any error/drop/… counters !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>WAN is not overbooked and should result in SDP-in on B being lower than SDP-out on A .<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Too-Big Pakets should be dropped on A PORT/SAP incoming,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>So should not get transmitted thru MPLS to B.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Setting all MTUs the the system Maximum solves this Problem ,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>So I have a workaround.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Any ideas what is going wrong ?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you for your help,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Juergen.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>