[rbak-nsp] strange BGP printouts...
Christopher O'Shea
casper.oshea at gmail.com
Sun Jan 15 03:20:02 EST 2012
Hi Marcin,
What does router map look like.
Chris O'Shea
On Sun, Jan 15, 2012 at 10:24 AM, Marcin Kuczera <marcin at leon.pl> wrote:
> 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 91.195.159.5 0 600 100 i
> >>>>> 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 91.195.159.9 0 600 100
> 13000 29314 i
> >>>>> 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>
>> Date: Sat, 14 Jan 2012 10:55:05 To: Ron Ripley<ripleyron at gmail.com>
>> Cc: Ronald Voermans<r.voermans at global-**datacenter.nl<r.voermans at global-datacenter.nl>>;
>> redback-nsp at puck.nether.net<re**dback-nsp at puck.nether.net<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 91.195.159.5 0 600 100 i
>>>>>> 37.8.192.0/18 91.195.159.5 0 600 100 i
>>>>>> 77.222.224.0/21 91.195.159.5 0 600 100 i
>>>>>> 77.222.232.0/21 91.195.159.5 0 600 100 i
>>>>>> 77.222.240.0/20 91.195.159.5 0 600 100 i
>>>>>> 78.31.136.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.0.0/20 91.195.159.5 0 600 100 i
>>>>>> 78.88.16.0/22 91.195.159.5 0 600 100 i
>>>>>> 78.88.20.0/23 91.195.159.5 0 600 100 i
>>>>>> 78.88.22.0/23 91.195.159.5 0 600 100 i
>>>>>> 78.88.24.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.32.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.40.0/23 91.195.159.5 0 600 100 i
>>>>>> 78.88.43.0/24 91.195.159.5 0 600 100 i
>>>>>> 78.88.48.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.56.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.64.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.72.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.80.0/22 91.195.159.5 0 600 100 i
>>>>>> 78.88.84.0/22 91.195.159.5 0 600 100 i
>>>>>> 78.88.88.0/23 91.195.159.5 0 600 100 i
>>>>>> 78.88.90.0/23 91.195.159.5 0 600 100 i
>>>>>> 78.88.92.0/24 91.195.159.5 0 600 100 i
>>>>>> 78.88.93.0/24 91.195.159.5 0 600 100 i
>>>>>> 78.88.96.0/21 91.195.159.5 0 600 100 i
>>>>>> 78.88.106.0/23 91.195.159.5 0 600 100 i
>>>>>> 78.88.108.0/24 91.195.159.5 0 600 100 i
>>>>>> 78.88.109.0/24 91.195.159.5 0 600 100 i
>>>>>> 78.88.110.0/23 91.195.159.5 0 600 100 i
>>>>>> 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 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 37.8.192.0/18 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 77.222.224.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 77.222.232.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 77.222.240.0/20 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.31.136.0/21 91.195.159.9 0 600 100
>>>>>> 13000 44124 i
>>>>>> 78.88.0.0/20 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.16.0/22 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.20.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.22.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.24.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.32.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.40.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.43.0/24 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.48.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.56.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.64.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.72.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.80.0/22 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.84.0/22 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.88.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.90.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.92.0/24 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.93.0/24 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.96.0/21 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.106.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.108.0/24 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.109.0/24 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 78.88.110.0/23 91.195.159.9 0 600 100
>>>>>> 13000 29314 i
>>>>>> 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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>>>>>
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>>>
>>>
>>
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