Hi Marcin,<br><br>What does router map look like. <br><br clear="all">Chris O'Shea<br><br>
<br><br><div class="gmail_quote">On Sun, Jan 15, 2012 at 10:24 AM, Marcin Kuczera <span dir="ltr"><<a href="mailto:marcin@leon.pl">marcin@leon.pl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im"><a href="mailto:ripleyron@gmail.com" target="_blank">ripleyron@gmail.com</a> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Not really, the originator of the route comes from an igp, this is pretty much all the time, it' advertised to the world and you receive it via your external eBGP session, but the initial origin of the route is preserved in the AS-PATH.<br>
<br>
if you have two eBGP sessions with two different upstream providers, you'll likely see differences in as-path etc.<br>
</blockquote>
<br></div>
Ok, prefix is allways sources by some IGP - maybe except quagga where "network 'prefix'" doesn't require IGP to put this prefix in routing table ;)<br>
<br>
However look at printouts of advertised routes copied fom below:<div class="im"><br>
>>>> [bgp1]R0_SE600#show bgp route neighbor 91.195.159.6 advertised<br>
>>>> Address Family: ipv4 unicast<br>
>>>> BGP table version is 24923469, local router ID is 195.66.73.250<br>
>>>> Status codes: d damped, h history, > best, i internal<br>
>>>> Origin codes: i - IGP, e - EGP, ? - incomplete<br>
>>>><br>
>>>> Network Next Hop Metric LocPrf Weight Path<br>
>>>>> <a href="http://31.11.128.0/17" target="_blank">31.11.128.0/17</a> 91.195.159.5 0 600 100 i<br>
>>>>> <a href="http://37.8.192.0/18" target="_blank">37.8.192.0/18</a> 91.195.159.5 0 600 100 i<br></div><div class="im">
>>>> [bgp1]R0_SE600#show bgp route neighbor 91.195.159.10 advertised<br>
>>>> Address Family: ipv4 unicast<br>
>>>> BGP table version is 24923504, local router ID is 195.66.73.250<br>
>>>> Status codes: d damped, h history, > best, i internal<br>
>>>> Origin codes: i - IGP, e - EGP, ? - incomplete<br>
>>>><br>
>>>> Network Next Hop Metric LocPrf Weight Path<br>
>>>>> <a href="http://31.11.128.0/17" target="_blank">31.11.128.0/17</a> 91.195.159.9 0 600 100 13000 29314 i<br>
>>>>> <a href="http://37.8.192.0/18" target="_blank">37.8.192.0/18</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<br></div>
Our AS is 13000.<br>
same routes, learned from same peer (external, AS29314) - advertised to 2 external peers with IDENTICAL route maps...<br>
First one is not showing AS patch at all....<br>
<br>
This is in my opinion some kind of a bug...<br>
<br>
Regards,<br>
Marcin<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Ron<br>
<br>
Sent from my BlackBerry device on the Rogers Wireless Network<br>
<br>
-----Original Message-----<br>
From: Marcin Kuczera <<a href="mailto:marcin@leon.pl" target="_blank">marcin@leon.pl</a>><br>
Date: Sat, 14 Jan 2012 10:55:05 To: Ron Ripley<<a href="mailto:ripleyron@gmail.com" target="_blank">ripleyron@gmail.com</a>><br>
Cc: Ronald Voermans<<a href="mailto:r.voermans@global-datacenter.nl" target="_blank">r.voermans@global-<u></u>datacenter.nl</a>>; <a href="mailto:redback-nsp@puck.nether.net" target="_blank">redback-nsp@puck.nether.net</a><<a href="mailto:redback-nsp@puck.nether.net" target="_blank">re<u></u>dback-nsp@puck.nether.net</a>><br>
Subject: Re: [rbak-nsp] strange BGP printouts...<br>
<br>
Ron Ripley wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
The "i" at the end of the AS Path; refers to the origin of an IGP, not iBGP. Origin codes: i - IGP, e - EGP, ? - incomplete<br>
<br>
</blockquote>
<br>
So still printouts are faulty, because all routes from printout below are from EGP (external BGP).<br>
<br>
Regards,<br>
Marcin<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Ron<br>
<br>
On 2012-01-13, at 5:58 AM, Ronald Voermans wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Marcin,<br>
<br>
the first one is seen as an internal neighbour (ibgp), hence the 'i' in the path. No as-path is neccessary with ibgp!<br>
<br>
Regards,<br>
Ronald<br>
<br>
Op 13 jan. 2012, om 13:53 heeft Marcin Kuczera het volgende geschreven:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
look here, I have 2 peers with exacly the same route-maps<br>
<br>
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Rst Up/Down PfxRcvd/Sent RstNeeded<br>
91.195.159.6 30799 91 102 24923197 0 0 1 01:24:59 4 274 No<br>
91.195.159.10 196858 18964 18991 24923213 0 0 2 1w6d 3 272 No<br>
<br>
<br>
Now, look at example of advertised routes:<br>
<br>
<br>
[bgp1]R0_SE600#show bgp route neighbor 91.195.159.6 advertised<br>
Address Family: ipv4 unicast<br>
BGP table version is 24923469, local router ID is 195.66.73.250<br>
Status codes: d damped, h history, > best, i internal<br>
Origin codes: i - IGP, e - EGP, ? - incomplete<br>
<br>
Network Next Hop Metric LocPrf Weight Path<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<a href="http://31.11.128.0/17" target="_blank">31.11.128.0/17</a> 91.195.159.5 0 600 100 i<br>
<a href="http://37.8.192.0/18" target="_blank">37.8.192.0/18</a> 91.195.159.5 0 600 100 i<br>
<a href="http://77.222.224.0/21" target="_blank">77.222.224.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://77.222.232.0/21" target="_blank">77.222.232.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://77.222.240.0/20" target="_blank">77.222.240.0/20</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.31.136.0/21" target="_blank">78.31.136.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.0.0/20" target="_blank">78.88.0.0/20</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.16.0/22" target="_blank">78.88.16.0/22</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.20.0/23" target="_blank">78.88.20.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.22.0/23" target="_blank">78.88.22.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.24.0/21" target="_blank">78.88.24.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.32.0/21" target="_blank">78.88.32.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.40.0/23" target="_blank">78.88.40.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.43.0/24" target="_blank">78.88.43.0/24</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.48.0/21" target="_blank">78.88.48.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.56.0/21" target="_blank">78.88.56.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.64.0/21" target="_blank">78.88.64.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.72.0/21" target="_blank">78.88.72.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.80.0/22" target="_blank">78.88.80.0/22</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.84.0/22" target="_blank">78.88.84.0/22</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.88.0/23" target="_blank">78.88.88.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.90.0/23" target="_blank">78.88.90.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.92.0/24" target="_blank">78.88.92.0/24</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.93.0/24" target="_blank">78.88.93.0/24</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.96.0/21" target="_blank">78.88.96.0/21</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.106.0/23" target="_blank">78.88.106.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.108.0/24" target="_blank">78.88.108.0/24</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.109.0/24" target="_blank">78.88.109.0/24</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.110.0/23" target="_blank">78.88.110.0/23</a> 91.195.159.5 0 600 100 i<br>
<a href="http://78.88.112.0/21" target="_blank">78.88.112.0/21</a> 91.195.159.5 0 600 100 i<br>
</blockquote>
[bgp1]R0_SE600#show bgp route neighbor 91.195.159.10 advertised<br>
Address Family: ipv4 unicast<br>
BGP table version is 24923504, local router ID is 195.66.73.250<br>
Status codes: d damped, h history, > best, i internal<br>
Origin codes: i - IGP, e - EGP, ? - incomplete<br>
<br>
Network Next Hop Metric LocPrf Weight Path<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<a href="http://31.11.128.0/17" target="_blank">31.11.128.0/17</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://37.8.192.0/18" target="_blank">37.8.192.0/18</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://77.222.224.0/21" target="_blank">77.222.224.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://77.222.232.0/21" target="_blank">77.222.232.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://77.222.240.0/20" target="_blank">77.222.240.0/20</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.31.136.0/21" target="_blank">78.31.136.0/21</a> 91.195.159.9 0 600 100 13000 44124 i<br>
<a href="http://78.88.0.0/20" target="_blank">78.88.0.0/20</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.16.0/22" target="_blank">78.88.16.0/22</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.20.0/23" target="_blank">78.88.20.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.22.0/23" target="_blank">78.88.22.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.24.0/21" target="_blank">78.88.24.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.32.0/21" target="_blank">78.88.32.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.40.0/23" target="_blank">78.88.40.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.43.0/24" target="_blank">78.88.43.0/24</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.48.0/21" target="_blank">78.88.48.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.56.0/21" target="_blank">78.88.56.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.64.0/21" target="_blank">78.88.64.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.72.0/21" target="_blank">78.88.72.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.80.0/22" target="_blank">78.88.80.0/22</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.84.0/22" target="_blank">78.88.84.0/22</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.88.0/23" target="_blank">78.88.88.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.90.0/23" target="_blank">78.88.90.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.92.0/24" target="_blank">78.88.92.0/24</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.93.0/24" target="_blank">78.88.93.0/24</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.96.0/21" target="_blank">78.88.96.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.106.0/23" target="_blank">78.88.106.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.108.0/24" target="_blank">78.88.108.0/24</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.109.0/24" target="_blank">78.88.109.0/24</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.110.0/23" target="_blank">78.88.110.0/23</a> 91.195.159.9 0 600 100 13000 29314 i<br>
<a href="http://78.88.112.0/21" target="_blank">78.88.112.0/21</a> 91.195.159.9 0 600 100 13000 29314 i<br>
</blockquote>
[bgp1]R0_SE600#<br>
<br>
<br>
the first one is strange, because it looks like AS path is missing.<br>
Is it a random bug ?<br>
<br>
Regards,<br>
Marcin<br>
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