Hi Matthias
We are using the following approach: ip as-path access-list limit-to-100 deny
^([0-9]+ ){99,}[0-9]+$
Cheers
Andreas
On Fri, Sep 08, 2017 at 04:52:47PM +0200, Matthias Ferdinand wrote:
> Hi,
>
> Cisco IOS seems to have a nice configuration setting
>
> bgp maxas-path <num>
>
> https://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfbgp1.html#wp1254976
>
> which apparently quagga does not have.
>
> So I set up an as-path access-list like so:
>
> ip as-path access-list maxas-limit75 deny
> _[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+
> ip as-path access-list maxas-limit75 permit .
>
> which seems to work, but is not nice to read. I tried to use counting
> regexes with braces ([0-9]{0,75}) without success. Is there a more
> elegant way to do it than above?
>
> Regards
> Matthias Ferdinand
--
andreas jaggi
lead engineer network services
open systems ag
raeffelstrasse 29
ch-8045 zurich
t: +41 58 100 10 10
f: +41 58 100 10 11
a...@open.ch
http://www.open.ch
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