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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Route table growth and hardware limits...talk to the filter
On Mon, Sep 10, 2007 at 10:16:17AM -0500, Stephen Sprunk wrote: > > Thus spake "Jon Lewis" <[email protected]> > >The trouble is, it turns out there are a number of networks where > >CIDR isn't spoken. They get their IP space from their RIR, break > >it up into /24s, and announce those /24s (the ones they're using > >anyway) into BGP as /24s with no covering CIDR. > > IMHO, such networks are broken and they should be filtered. If people > doing this found themselves unable to reach the significant fraction of the > Net (or certain key sites), they would add the covering route even if they > were hoping people would accept their incompetent/TE /24s. well, your assumptio n about how prefixes are used might be tempered with the thought that some /24s are used for interconnecting ISP's at exchanges... and for that matter it seems a lazy ISP to pass the buck on "routability" to an org that runs no transit infrastructure. RIR's (Well ARIN anyway) has NEVER assured routability of a delegated prefix. Tracking /filters based on RIR delegation policy seems like a leap to me... --bill > > Stephen Sprunk "God does not play dice." --Albert Einstein
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