[rbak-nsp] strange BGP printouts...
Marcin Kuczera
marcin at leon.pl
Sun Jan 15 07:34:51 EST 2012
Christopher O'Shea wrote:
> Hi Marcin,
>
> What does router map look like.
!
route-map direct-peering-rix-in permit 10
set community 13000:9998 13000:9999
set local-preference 600
!
route-map direct-peering-rix-out permit 5
match as-path-list AS13000-only
route-map direct-peering-rix-out permit 10
match community-list kdi-full-bgp
route-map direct-peering-rix-out permit 11
match community-list rix-peering
!
!
community-list kdi-full-bgp
seq 10 permit 13000:9900
!
community-list rix-peering
seq 10 permit 13000:9998
!
!
as-path-list AS13000-only
seq 10 permit ^$
!
Regards,
Marcin
>
> Chris O'Shea
>
>
>
> On Sun, Jan 15, 2012 at 10:24 AM, Marcin Kuczera <marcin at leon.pl
> <mailto:marcin at leon.pl>> wrote:
>
> ripleyron at gmail.com <mailto:ripleyron at gmail.com> wrote:
>
> 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.
>
> if you have two eBGP sessions with two different upstream
> providers, you'll likely see differences in as-path etc.
>
>
> 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 ;)
>
> However look at printouts of advertised routes copied fom below:
>
> >>>> [bgp1]R0_SE600#show bgp route neighbor 91.195.159.6 advertised
> >>>> Address Family: ipv4 unicast
> >>>> BGP table version is 24923469, local router ID is 195.66.73.250
> >>>> Status codes: d damped, h history, > best, i internal
> >>>> Origin codes: i - IGP, e - EGP, ? - incomplete
> >>>>
> >>>> Network Next Hop Metric LocPrf
> Weight Path
> >>>>> 31.11.128.0/17 <http://31.11.128.0/17> 91.195.159.5
> 0 600 100 i
> >>>>> 37.8.192.0/18 <http://37.8.192.0/18> 91.195.159.5
> 0 600 100 i
> >>>> [bgp1]R0_SE600#show bgp route neighbor 91.195.159.10 advertised
> >>>> Address Family: ipv4 unicast
> >>>> BGP table version is 24923504, local router ID is 195.66.73.250
> >>>> Status codes: d damped, h history, > best, i internal
> >>>> Origin codes: i - IGP, e - EGP, ? - incomplete
> >>>>
> >>>> Network Next Hop Metric LocPrf
> Weight Path
> >>>>> 31.11.128.0/17 <http://31.11.128.0/17> 91.195.159.9
> 0 600 100 13000 29314 i
> >>>>> 37.8.192.0/18 <http://37.8.192.0/18> 91.195.159.9
> 0 600 100 13000 29314 i
>
> Our AS is 13000.
> same routes, learned from same peer (external, AS29314) - advertised
> to 2 external peers with IDENTICAL route maps...
> First one is not showing AS patch at all....
>
> This is in my opinion some kind of a bug...
>
> Regards,
> Marcin
>
>
>
>
>
> Ron
>
> Sent from my BlackBerry device on the Rogers Wireless Network
>
> -----Original Message-----
> From: Marcin Kuczera <marcin at leon.pl <mailto:marcin at leon.pl>>
> Date: Sat, 14 Jan 2012 10:55:05 To: Ron
> Ripley<ripleyron at gmail.com <mailto:ripleyron at gmail.com>>
> Cc: Ronald Voermans<r.voermans at global-__datacenter.nl
> <mailto:r.voermans at global-datacenter.nl>>;
> redback-nsp at puck.nether.net
> <mailto:redback-nsp at puck.nether.net><re__dback-nsp at puck.nether.net
> <mailto:redback-nsp at puck.nether.net>>
> Subject: Re: [rbak-nsp] strange BGP printouts...
>
> Ron Ripley wrote:
>
> Hi,
>
> 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
>
>
> So still printouts are faulty, because all routes from printout
> below are from EGP (external BGP).
>
> Regards,
> Marcin
>
>
> Ron
>
> On 2012-01-13, at 5:58 AM, Ronald Voermans wrote:
>
> Hi Marcin,
>
> the first one is seen as an internal neighbour (ibgp),
> hence the 'i' in the path. No as-path is neccessary with
> ibgp!
>
> Regards,
> Ronald
>
> Op 13 jan. 2012, om 13:53 heeft Marcin Kuczera het
> volgende geschreven:
>
> look here, I have 2 peers with exacly the same
> route-maps
>
> Neighbor AS MsgRcvd MsgSent TblVer
> InQ OutQ Rst Up/Down PfxRcvd/Sent RstNeeded
> 91.195.159.6 30799 91 102 24923197
> 0 0 1 01:24:59 4 274 No
> 91.195.159.10 196858 18964 18991 24923213
> 0 0 2 1w6d 3 272 No
>
>
> Now, look at example of advertised routes:
>
>
> [bgp1]R0_SE600#show bgp route neighbor 91.195.159.6
> advertised
> Address Family: ipv4 unicast
> BGP table version is 24923469, local router ID is
> 195.66.73.250
> Status codes: d damped, h history, > best, i internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric
> LocPrf Weight Path
>
> 31.11.128.0/17 <http://31.11.128.0/17>
> 91.195.159.5 0 600 100 i
> 37.8.192.0/18 <http://37.8.192.0/18>
> 91.195.159.5 0 600 100 i
> 77.222.224.0/21 <http://77.222.224.0/21>
> 91.195.159.5 0 600 100 i
> 77.222.232.0/21 <http://77.222.232.0/21>
> 91.195.159.5 0 600 100 i
> 77.222.240.0/20 <http://77.222.240.0/20>
> 91.195.159.5 0 600 100 i
> 78.31.136.0/21 <http://78.31.136.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.0.0/20 <http://78.88.0.0/20>
> 91.195.159.5 0 600 100 i
> 78.88.16.0/22 <http://78.88.16.0/22>
> 91.195.159.5 0 600 100 i
> 78.88.20.0/23 <http://78.88.20.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.22.0/23 <http://78.88.22.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.24.0/21 <http://78.88.24.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.32.0/21 <http://78.88.32.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.40.0/23 <http://78.88.40.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.43.0/24 <http://78.88.43.0/24>
> 91.195.159.5 0 600 100 i
> 78.88.48.0/21 <http://78.88.48.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.56.0/21 <http://78.88.56.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.64.0/21 <http://78.88.64.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.72.0/21 <http://78.88.72.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.80.0/22 <http://78.88.80.0/22>
> 91.195.159.5 0 600 100 i
> 78.88.84.0/22 <http://78.88.84.0/22>
> 91.195.159.5 0 600 100 i
> 78.88.88.0/23 <http://78.88.88.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.90.0/23 <http://78.88.90.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.92.0/24 <http://78.88.92.0/24>
> 91.195.159.5 0 600 100 i
> 78.88.93.0/24 <http://78.88.93.0/24>
> 91.195.159.5 0 600 100 i
> 78.88.96.0/21 <http://78.88.96.0/21>
> 91.195.159.5 0 600 100 i
> 78.88.106.0/23 <http://78.88.106.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.108.0/24 <http://78.88.108.0/24>
> 91.195.159.5 0 600 100 i
> 78.88.109.0/24 <http://78.88.109.0/24>
> 91.195.159.5 0 600 100 i
> 78.88.110.0/23 <http://78.88.110.0/23>
> 91.195.159.5 0 600 100 i
> 78.88.112.0/21 <http://78.88.112.0/21>
> 91.195.159.5 0 600 100 i
>
> [bgp1]R0_SE600#show bgp route neighbor 91.195.159.10
> advertised
> Address Family: ipv4 unicast
> BGP table version is 24923504, local router ID is
> 195.66.73.250
> Status codes: d damped, h history, > best, i internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric
> LocPrf Weight Path
>
> 31.11.128.0/17 <http://31.11.128.0/17>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 37.8.192.0/18 <http://37.8.192.0/18>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 77.222.224.0/21 <http://77.222.224.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 77.222.232.0/21 <http://77.222.232.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 77.222.240.0/20 <http://77.222.240.0/20>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.31.136.0/21 <http://78.31.136.0/21>
> 91.195.159.9 0 600 100
> 13000 44124 i
> 78.88.0.0/20 <http://78.88.0.0/20>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.16.0/22 <http://78.88.16.0/22>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.20.0/23 <http://78.88.20.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.22.0/23 <http://78.88.22.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.24.0/21 <http://78.88.24.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.32.0/21 <http://78.88.32.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.40.0/23 <http://78.88.40.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.43.0/24 <http://78.88.43.0/24>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.48.0/21 <http://78.88.48.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.56.0/21 <http://78.88.56.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.64.0/21 <http://78.88.64.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.72.0/21 <http://78.88.72.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.80.0/22 <http://78.88.80.0/22>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.84.0/22 <http://78.88.84.0/22>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.88.0/23 <http://78.88.88.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.90.0/23 <http://78.88.90.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.92.0/24 <http://78.88.92.0/24>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.93.0/24 <http://78.88.93.0/24>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.96.0/21 <http://78.88.96.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.106.0/23 <http://78.88.106.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.108.0/24 <http://78.88.108.0/24>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.109.0/24 <http://78.88.109.0/24>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.110.0/23 <http://78.88.110.0/23>
> 91.195.159.9 0 600 100
> 13000 29314 i
> 78.88.112.0/21 <http://78.88.112.0/21>
> 91.195.159.9 0 600 100
> 13000 29314 i
>
> [bgp1]R0_SE600#
>
>
> the first one is strange, because it looks like AS
> path is missing.
> Is it a random bug ?
>
> Regards,
> Marcin
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