[c-nsp] 6500/7600 TCAM Usage

Saku Ytti saku at ytti.fi
Fri Jun 3 11:47:47 EDT 2016

On 3 June 2016 at 18:39, James Bensley <jwbensley at gmail.com> wrote:

>> Not all platforms use TCAMs. Lot of Juniper kit, like MX, QFX10k, PTX
>> use various types of DRAM solution, this makes FIB usually not your
>> bottleneck, search time to larger database becomes an issue too.
> If vendors switched to using hashed tables we would get consistent
> look up times irrelevant of table size.

Vendors are using all kind of algorithms and inventing new ones. It is
by far more complex than 'trie' or 'hash', particularly when using
DRAM memories, like Juniper is. I believe Juniper has done lot of
academic work on this, maybe partly procket  legacy. But I think it's
trade-secret not published work.


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