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BGP Route Issues
- Subject: BGP Route Issues
- From: randy_94108 at yahoo.com (Randy)
- Date: Mon, 19 Aug 2013 07:09:22 -0700 (PDT)
- In-reply-to: <CAARHE5E4kwffSh_kVoCN-0K1zZuRYRS=F3oCo-OWkG+Zg7_z1w@mail.gmail.com>
- References: <[email protected]> <CAJvB4tnTX=5s7iu8jQixZ58bDPoLVf=c5NkFEaQ36z6LsHYaWw@mail.gmail.com> <[email protected]> <CAARHE5E4kwffSh_kVoCN-0K1zZuRYRS=F3oCo-OWkG+Zg7_z1w@mail.gmail.com>
yes of course..sorry for the typos
>________________________________
> From: Fakrul Alam Pappu <fakrulalam at gmail.com>
>To: Randy <randy_94108 at yahoo.com>
>Cc: Blake Dunlap <ikiris at gmail.com>; Christopher Karel <chris.karel at gmail.com>; "nanog at nanog.org" <nanog at nanog.org>
>Sent: Monday, August 19, 2013 5:27 AM
>Subject: Re: BGP Route Issues
>
>
>
>Won't it be backslash rather than forward slash?
>
>_([0-9]+) _\1_\1_\1_
>
>
>
>On Mon, Aug 19, 2013 at 9:51 AM, Randy <randy_94108 at yahoo.com> wrote:
>
>11 prepends is beyond-excessive besides being annoying.
>>filter please _([0-9]+) _/1_/1_/1_
>>
>>
>>
>>
>>>________________________________
>>> From: Blake Dunlap <ikiris at gmail.com>
>>>To: Christopher Karel <chris.karel at gmail.com>
>>>Cc: "nanog at nanog.org" <nanog at nanog.org>
>>>Sent: Sunday, August 18, 2013 7:42 PM
>>>Subject: Re: BGP Route Issues
>>
>>>
>>>
>>>Local Pref (which is common by the way to be set so customers > peers >
>>>transit). AS Path doesn't beat it.
>>>You can only request people follow the routes you want ingress, there's
>>>nothing you can do to force them to take a path to you short of
>>>deaggregation, and that only works until they notice it, and it irratates
>>>the rest of the world as well by using additional route slots.
>>>
>>>Poor routing is purely a viewpoint problem, not necessarily in agreement
>>>between all parties.
>>>
>>>-Blake
>>>
>>>
>>>On Sun, Aug 18, 2013 at 8:33 PM, Christopher Karel <chris.karel at gmail.com>wrote:
>>>
>>>>? ?Good evening,
>>>>
>>>>? ? ?I'm hoping you guys might be able to offer some advice or insight into
>>>> a BGP problem I've got.? I've noticed some strange routes between our
>>>> network, AS27270, and AS22943.? It looks like both our networks are dual
>>>> homed.? One ISP as the primary, and the other used as a backup, with path
>>>> prepending to prevent it from actually being used except in an outage.
>>>>? However, our route to 22943 appears to be using their backup link.? (27270
>>>> 4323 7018 22943 22943 22943 22943 22943 22943 22943 22943 22943 22943
>>>> 22943)? Which is strange, because we can reach their primary ISP without
>>>> any such rigmarole.
>>>>
>>>>? ? ?Playing around with Looking Glass servers indicates that Cogent
>>>> (AS174) has a similar backup route to our network.? (174 22402 27270 27270
>>>> 27270 27270 27270 27270)? Everywhere else I check seems perfectly sane.
>>>>? But since Cogent is essentially in-between the two networks I'm
>>>> troubleshooting, I would assume that the other network has a similar route.
>>>>? But Cogent won't talk with me about this, since I'm not a customer.
>>>>
>>>>? ? ?So as far as advice goes, is there a common issue that might result in
>>>> such poor routes in both directions?? Any further troubleshooting that I
>>>> should be doing?? Or any ideas on how to help remedy things that appear to
>>>> be outside our network/ISP?? Or are we doing something so wrong that this
>>>> is all my fault?
>>>>
>>>> I'd really appreciate any input on this.
>>>>
>>>>
>>>
>>>
>>>
>>
>
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