From: Hobbs (deadheadblues@gmail.com)
Date: Thu Oct 23 2008 - 12:35:45 ARST
Well so far I haven't really found what I find was the "optimum" solution, I
don't even know if there is one. Even if it does display the AS_paths with 8
of the same AS, thats ALL I want. I don't want anything with 2 or 3 or 4 of
that AS...know what I mean? I also don't want paths with 8 AS made up of
different numbers. That's what I have been getting so far.
What I need is a plus sign + on steroids.
Victor, your command is interesting it's just not giving me any
output...example:
route-server>show ip bgp regexp ^([13332]+)(_\1)*$
route-server>
Could you explain what the \1 does ? I can't find any info on this
Nick, question marks wont work because they also match 0 instances...but I
will try with plus signs instead, maybe you have something there...
Thanks again everyone...maybe it would be easier to break it down like this:
Find all AS paths with a double occurrence of any number, example
500 500 100 200 300 ?
100 200 300 400 400 ?
But the regexp would have to take in account ALL possible numbers not just
400 or 500.
Then the regexp could be easily modified to look for 3 occurrences, then 4,
then 5, etc
On Wed, Oct 22, 2008 at 10:30 PM, Nick Matthews <matthn@gmail.com> wrote:
> I had actually thought about this before. I think you can do it with the ?
> operator.
>
> _(700)?(700)?(700)?(700)?
>
> May even be able to try nesting them for larger amounts, haven't tested:
>
> _(( (700)? (700)? ) ?)?
>
> I believe this would allow up to 8 times. If you can nest the ? then you
> can use powers to very quickly reach certain numbers. Unless you want some
> silly number like 37.
>
>
>
>
> Nick
>
>
> On Wed, Oct 22, 2008 at 11:05 PM, Joseph Brunner <joe@affirmedsystems.com>wrote:
>
>> So Victor are you studying for the Perl Certified Expert Programmer LOL
>>
>> You little PCEP
>>
>> LOL
>>
>> Thanks for the code snippet!
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> Victor Cappuccio
>> Sent: Wednesday, October 22, 2008 5:48 PM
>> To: deadheadblues@gmail.com
>> Cc: GS CCIE-Lab
>> Subject: Re: BGP regexp - how to find x number or more occurrences of an
>> AS
>> in the AS path
>>
>> hi, maybe something like
>> ^([0-9]+)(_\1)*$
>> also could help ??
>>
>>
>> R1(config-router)#do show ip bgp reg ^([0-9]+)(_\1)*$
>> BGP table version is 3, local router ID is 172.22.81.1
>> Status codes: s suppressed, d damped, h history, * valid, > best, i -
>> internal,
>> r RIB-failure, S Stale
>> Origin codes: i - IGP, e - EGP, ? - incomplete
>>
>> Network Next Hop Metric LocPrf Weight Path
>> *> 2.2.2.0/24 172.22.142.2 0 0 2 2 2 2 2 2
>> 2 2
>> 2 ?
>> R1(config-router)#do show ip bgp reg ^(2+)(_\1)*$
>> BGP table version is 3, local router ID is 172.22.81.1
>> Status codes: s suppressed, d damped, h history, * valid, > best, i -
>> internal,
>> r RIB-failure, S Stale
>> Origin codes: i - IGP, e - EGP, ? - incomplete
>>
>> Network Next Hop Metric LocPrf Weight Path
>> *> 2.2.2.0/24 172.22.142.2 0 0 2 2 2 2 2 2
>> 2 2
>> 2 ?
>> R1(config-router)#
>> Diapositiva 12
>> thanks,
>>
>>
>> On Wed, Oct 22, 2008 at 7:50 PM, Marko Milivojevic
>> <markom@markom.info>wrote:
>>
>> > > Suppose I wanted to find all routes that have the same AS number in a
>> > > row 8
>> > > or more times...is this possible using regexp?
>> >
>> > I don't think that IOS regex engine supports "match N occurences"
>> > syntax that more advanced regex engines (like the one in Perl, for
>> > example) do. If if did support it, it would look something like:
>> >
>> > _(12345){8,}
>> >
>> > If you want to match 8 times or more, where 8 is fixed, you could do
>> > something like (oh, ugly):
>> >
>> > _12345_12345_12345_12345_12345_12345_12345_12345_(12345)*
>> >
>> > --
>> > Marko
>> > CCIE #18427 (SP)
>> > My network blog: http://cisco.markom.info/
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
>> > Subscription information may be found at:
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> --
>> Victor Cappuccio
>> CCIE R/S# 20657
>> CCSI# 30452
>> www.anetworkerblog.com
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
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>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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