Patch to reveal more information in SHOW ROUTE

[Chris Caputo]

As an option to "show route", I would use this.

Thanks,
Chris

On Thu, 22 Jan 2015, Andrew Francis wrote:
> Hi,
> 
> 
> 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 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