Patch to reveal more information in SHOW ROUTE

[Ondrej Filip]

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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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