nanog mailing list archives
Re: filtering /48 is going to be necessary
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Mon, 12 Mar 2012 15:17:46 +0900
William Herrin wrote:
C) Big iron is either using massively parallel FIBs (many copies of the radix tree) or they're using TCAM instead of DRAM, a specialized tristate version of SRAM. In either case, you're talking 10 to 100 times the cost, ten times the power consumption and ten times the heat versus DRAM.
TCAM is a specialized version of CAM. CAM is much worse than SRAM.
A router handling 10M routes is achievable today if we're willing to go back to $20k as the minimum cost BGP box. That's an order of magnitude more than we have now and three orders of magnitude short of where we need to be before we can stop sweating the prefix count.
For 16M routes, we only need /24. With /24 aggregation, route look up is trivially easy with a 16M entry single chip SRAM every 3ns consuming 1W. That's why IPv4 or original IPv6 proposal with 8B address is much better than the current IPv6. Masataka Ohta
Current thread:
- RE: filtering /48 is going to be necessary, (continued)
- RE: filtering /48 is going to be necessary Leo Vegoda (Mar 09)
- Re: filtering /48 is going to be necessary Owen DeLong (Mar 09)
- Re: filtering /48 is going to be necessary Joel jaeggli (Mar 09)
- Re: filtering /48 is going to be necessary Randy Bush (Mar 09)
- RE: filtering /48 is going to be necessary George Bonser (Mar 09)
- Re: filtering /48 is going to be necessary Joel jaeggli (Mar 09)
- RE: filtering /48 is going to be necessary George Bonser (Mar 09)
- Re: filtering /48 is going to be necessary Jimmy Hess (Mar 10)
- Re: filtering /48 is going to be necessary Sven Olaf Kamphuis (Mar 10)
- Re: filtering /48 is going to be necessary William Herrin (Mar 10)
- Re: filtering /48 is going to be necessary Masataka Ohta (Mar 11)
- Re: filtering /48 is going to be necessary Seth Mattinen (Mar 10)
- Re: filtering /48 is going to be necessary Joel jaeggli (Mar 10)
- Re: filtering /48 is going to be necessary Owen DeLong (Mar 10)
- Re: filtering /48 is going to be necessary Sven Olaf Kamphuis (Mar 10)
- Re: filtering /48 is going to be necessary Jared Mauch (Mar 12)
- Re: filtering /48 is going to be necessary Sven Olaf Kamphuis (Mar 10)
- Re: filtering /48 is going to be necessary Owen DeLong (Mar 10)
- Re: filtering /48 is going to be necessary Jimmy Hess (Mar 09)
- RE: filtering /48 is going to be necessary George Bonser (Mar 09)
- Re: filtering /48 is going to be necessary Sascha Lenz (Mar 10)