
<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body><div style="font-family:Helvetica,Arial;font-size:13px"><p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">Hi all!</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue";min-height:16px"><br></p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">I use bird2 (2.0.9) as RS for BGP prefix aggregation - several peers send me their prefixes, I aggregate them and send the result to the system.</p><p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue""><br></p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">But there is an obvious issue - when peers send me the same prefix, BGP selects the best one and sends only that one. In this case, if prefixes had different communities, the result loses all but one.</p><p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue""><br></p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">For example:</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">peer 1: <span style="color:#52adf7"><a href="http://1.1.1.1/32">1.1.1.1/32</a></span> 1:100</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">peer 2: <span style="color:#52adf7"><a href="http://1.1.1.1/32">1.1.1.1/32</a></span> 2:200</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">peer 3: <span style="color:#52adf7"><a href="http://1.1.1.1/32">1.1.1.1/32</a></span> 3:300</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue""><br></p><p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">If the last one was chosen, the result is <span style="color:#52adf7"><a href="http://1.1.1.1/32">1.1.1.1/32</a></span> 3:300</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue";min-height:16px"><br></p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">If there is any way to collect all communities and attach them to the chosen prefix (like this: <span style="color:#52adf7"><a href="http://1.1.1.1/32">1.1.1.1/32</a></span> 1:100,2:200,3:300), would anyone please tell me how to do that?</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue";min-height:16px"><br></p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">Thank you,</p>

<p style="margin:0px;font-stretch:normal;font-size:14px;line-height:normal;font-family:"Helvetica Neue"">Valery</p></div><br><div class="gmail_signature"></div></body></html>