<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div class="" id="yui_3_16_0_1_1444557033460_18602"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18604" class="">Dear Maurizio and Colin, <o:p id="yui_3_16_0_1_1444557033460_18606" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18602"><span style="font-family:"Times New Roman",serif" class=""><br></span></div><div class="" id="yui_3_16_0_1_1444557033460_18608"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18610" class="">Thank you for your responses. <o:p id="yui_3_16_0_1_1444557033460_18612" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18608"><span style="font-family:"Times New Roman",serif" class=""><br></span></div><div class="" id="yui_3_16_0_1_1444557033460_18614"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18616" class="">It was by mistake that I send an example where BGP messages are not coming from the same peer. All four messages in the example were supposed to have same peer, and announced IP address while different AS-PATH attribute.<o:p id="yui_3_16_0_1_1444557033460_18618" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18620"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18622" class="">In that case I would have three implicit withdrawals, right?<o:p id="yui_3_16_0_1_1444557033460_18624" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18620"><span style="font-family:"Times New Roman",serif" class=""><br></span></div><div class="" id="yui_3_16_0_1_1444557033460_18626"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18628" class="">Colin,<o:p id="yui_3_16_0_1_1444557033460_18630" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18632"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18634" class=""> </span></div><div class="" id="yui_3_16_0_1_1444557033460_18636"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18638" class="">Are you suggesting that if I look at five-days worth of BGP update messages and trying to count how many implicit withdrawals during that time I have that I need to check first appearance of every announced IP address and check if it is ‘truly’ new announcement or possibly an implicit withdrawal that happened prior to the time frame I am looking at? <o:p id="yui_3_16_0_1_1444557033460_18640" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18642"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18644" class="">Also, I was completely ignoring the state change messages. Are you referring to the messages below? I am not sure what to make out of those.<o:p id="yui_3_16_0_1_1444557033460_18646" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18648"><span style="font-family:"Times New Roman",serif" class=""><br></span></div><div class="" id="yui_3_16_0_1_1444557033460_18648"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18650" class="">Best regards,<o:p id="yui_3_16_0_1_1444557033460_18652" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18654"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18656" class="">Ado<o:p id="yui_3_16_0_1_1444557033460_18658" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18660"><span style="font-family:"Times New Roman",serif" class=""><br></span></div><div class="" id="yui_3_16_0_1_1444557033460_18660"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18662" class="">TIME: 2001-9-16 00:00:09<o:p id="yui_3_16_0_1_1444557033460_18664" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18666"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18668" class="">TYPE: BGP4MP/BGP4MP_STATE_CHANGE AFI_IP<o:p id="yui_3_16_0_1_1444557033460_18670" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18672"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18674" class="">FROM: 192.65.185.151<o:p id="yui_3_16_0_1_1444557033460_18676" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18678"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18680" class="">OLD STATE: 3 NEW STATE: 2<o:p id="yui_3_16_0_1_1444557033460_18682" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18684"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18686" class=""> </span></div><div class="" id="yui_3_16_0_1_1444557033460_18688"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18690" class="">TIME: 2001-9-16 00:00:09<o:p id="yui_3_16_0_1_1444557033460_18692" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18694"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18696" class="">TYPE: BGP4MP/BGP4MP_STATE_CHANGE AFI_IP<o:p id="yui_3_16_0_1_1444557033460_18698" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18700"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18702" class="">FROM: 192.65.185.151<o:p id="yui_3_16_0_1_1444557033460_18704" class=""></o:p></span></div><div class="" id="yui_3_16_0_1_1444557033460_18706"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18708" class="">OLD STATE: 2 NEW STATE: 3<o:p id="yui_3_16_0_1_1444557033460_18710" class=""></o:p></span></div><div id="yui_3_16_0_1_1444557033460_18594"> </div><div class="" dir="ltr" id="yui_3_16_0_1_1444557033460_18712"><span style="font-family:"Times New Roman",serif" id="yui_3_16_0_1_1444557033460_18714" class=""> </span></div></div></body></html>