[AusNOG] Whats peoples BCP for Unused IP Space on Routers ?

[Luke Iggleden]

Blackhole/Null route your aggregates & announce aggregate to transit.

This has an added ability to announce more specifics to IX's that accept 
it, eg PIPE. (upto /29) which get's around other providers trying to 
engineer traffic towards you. :)  (something that AS path-prepend can't 
deliver for example)




On 3/12/12 10:55 AM, Shaun Deans wrote:
> Morning Noggers ?
>
> I'm looking for some quick feedback on what peoples BCP (Best Common
> Practice) is when it comes to unused ip space. For example if you have
> the ip range 1.2.3.0/24 and you only have 1.2.3.0/25 active/routed
> what do you do with 1.2.3.128/25.
>
> I have seen many techniques including:
> - ACLs (Bad IMHO as it requires CPU cycles)
> - Tying to a Loopback (Bad: Leaves ip's open on router which require acls/cpu)
> - Null routing ( would be my pick)
> - Nothing at all (Very Bad as it would bubble up causing routing loops)
>
> Gave it a google and there were no real BCP's that stood out so im
> interested to hear what everyone else does ?
>
> Cheers
>
> S
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