Patch to reveal more information in SHOW ROUTE

[Andrew Francis]

Thanks Ondrej,

That query does seem to return all the routes of interest, but it takes a
long time (many seconds per query). I'm guessing it's not FIB accelerated?

One of the things we're doing is script-driven bulk data collection, so we
probably want something faster. (We have about 50 million routes.)

Thanks



Andrew Francis   |   *Twitch* <http://www.twitch.tv/>   |   Engineering   |
  415 430 8612


On Fri, Jan 23, 2015 at 3:09 AM, Ondrej Filip <feela at network.cz> wrote:

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> On 23.1.2015 06:40, Andrew Francis wrote:
> > Hi,
> >
>
> Hi Andrew,
> thank you for your e-mail. But isn't this command doing what you
> require:
>
> bird> show route where 192.168.168.168 ~ net
>
> ?
>
>                 Ondrej
>
>
>
>
> >
> > Twitch's network operations department uses BIRD as a
> > centralized looking glass. It's a BGP route reflector that is
> > peered with all our border routers. Staff use the route reflector
> > to inspect how a destination network can be reached from our
> > different points-of-presence.
> >
> >
> > Some peers will advertise the same IP as part of different
> > prefix lengths, likely due to aggregation or filtering. For
> > instance, one provider advertises 117.120.24.0/22
> > <http://117.120.24.0/22> to us, but all others only advertise a
> > /21.
> >
> >
> > Querying SHOW ROUTE on the looking glass shows the /22 on one
> > border router, and hides the /21's. This makes sense as a routing
> > decision from the location of the looking glass, but doesn't give
> > us the global visibility we want.
> >
> >
> > I have a patch which adds an option to SHOW ROUTE to reveal all
> > prefixes, regardless of length / best-match, covering a
> > particular IP.
> >
> >
> > This produces tons of output. I am also working on an option to
> > print the single best prefix for each unique BGP.next_hop /
> > BGP.originator_id. This gives us exactly what we want: the route
> > taken to a particular IP from each border router.
> >
> >
> > Would the community be interested in integrating this feature? If
> > so, I'll start the process here to get a patch released
> > publicly.
> >
> >
> > Thanks
> >
> >
> >
> > Andrew Francis   |   *Twitch* <http://www.twitch.tv/>   |
> > Engineering
> >
>
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