<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV><DIV>I'm suspecting that the customers problem was BGP Flap Damping (or Dampening) and that somehow the explanation got lost in translation somewhere (I've tried explaining it to some non-engineers sometimes and it is a tricky concept for many to grasp for some reason...)</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Whether its "normal" or a good idea or who does / doesn't do it is a topic fraught with religion....</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Warren</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>On Oct 29, 2007, at 2:15 PM, Jim McBurnett wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV class="Section1"><P class="MsoNormal"><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; ">Hello,</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; "></O:P></P><P class="MsoNormal"><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; ">Recently I have been told that some ISP’s are automatically or maybe manually modifying their BGP inbound prefix listing after a network is not advertised to them for a period of time.</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; "></O:P></P><P class="MsoNormal"><O:P style="font-family: Calibri; font-size: 14.6667px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; "> </SPAN></O:P></P><P class="MsoNormal"><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; ">So the questions I pose to the group:</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; "></O:P></P><P class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN style="mso-list:Ignore; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">1.</SPAN><SPAN style="font:7.0pt " times="" new="" roman";="" font-family:="" roman;="" font-size:="" 9.33333px;="" text-indent:="" -24px;=""><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 9.33333px; text-indent: -24px; "> </SPAN></SPAN></SPAN><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">Is this normal?</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "></O:P></P><P class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN style="mso-list:Ignore; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">2.</SPAN><SPAN style="font:7.0pt " times="" new="" roman";="" font-family:="" roman;="" font-size:="" 9.33333px;="" text-indent:="" -24px;=""><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 9.33333px; text-indent: -24px; "> </SPAN></SPAN></SPAN><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">Can anyone share your policies?</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "></O:P></P><P class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN style="mso-list:Ignore; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">3.</SPAN><SPAN style="font:7.0pt " times="" new="" roman";="" font-family:="" roman;="" font-size:="" 9.33333px;="" text-indent:="" -24px;=""><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 9.33333px; text-indent: -24px; "> </SPAN></SPAN></SPAN><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">Who does it?</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "></O:P></P><P class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN style="mso-list:Ignore; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">4.</SPAN><SPAN style="font:7.0pt " times="" new="" roman";="" font-family:="" roman;="" font-size:="" 9.33333px;="" text-indent:="" -24px;=""><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 9.33333px; text-indent: -24px; "> </SPAN></SPAN></SPAN><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">How often?</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "></O:P></P><P class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN style="mso-list:Ignore; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">5.</SPAN><SPAN style="font:7.0pt " times="" new="" roman";="" font-family:="" roman;="" font-size:="" 9.33333px;="" text-indent:="" -24px;=""><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 9.33333px; text-indent: -24px; "> </SPAN></SPAN></SPAN><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">Is it automagic? Or the dirty work slaved off to the junior engineer in the corner somewhere?</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "></O:P></P><P class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in; mso-list:l0 level2 lfo1; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN style="mso-list:Ignore; font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">a.</SPAN><SPAN style="font:7.0pt " times="" new="" roman";="" font-family:="" roman;="" font-size:="" 9.33333px;="" text-indent:="" -24px;=""><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 9.33333px; text-indent: -24px; "> </SPAN></SPAN></SPAN><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; ">I know you probably won’t trust that junior engineer, but some do….</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; text-indent: -24px; "></O:P></P><P class="MsoNormal"><O:P style="font-family: Calibri; font-size: 14.6667px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; "> </SPAN></O:P></P><P class="MsoNormal"><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; ">Anyway just a little research after a small problem a customer recently had.</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; "></O:P></P><P class="MsoNormal"><O:P style="font-family: Calibri; font-size: 14.6667px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; "> </SPAN></O:P></P><P class="MsoNormal"><O:P style="font-family: Calibri; font-size: 14.6667px; "><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; "> </SPAN></O:P></P><P class="MsoNormal"><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; ">Thanks,</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; "></O:P></P><P class="MsoNormal"><SPAN class="Apple-style-span" style="font-family: Calibri; font-size: 14.6667px; ">Jim</SPAN><O:P style="font-family: Calibri; font-size: 14.6667px; "></O:P></P></DIV><BR class="Apple-interchange-newline"></SPAN></BLOCKQUOTE></DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>--</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">She'd even given herself a middle initial - X - which stood for "someone who has a cool and exciting middle name".</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "> <SPAN class="Apple-converted-space"> </SPAN>-- (Terry Pratchett, Maskerade)</DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></BODY></HTML>