-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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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