Hi Frank, that is correct: there is no TCAM. SRAM access speeds are lower than TCAM, but the tradeoff is that lookups have variable search latency. What you probably care about most, is that both the MLX and CER can forward Layer 3 at wire-speed for 64 byte frames regardless of the type of memory that is used.
You can have a look at a presentation I gave recently if you want more details on memory architectures (slides 7 and 8): https://ripe64.ripe.net/presentations/18-ripe-64-router-architecture-challenges.pdf Greg -- Greg Hankins <[email protected]> -----Original Message----- Date: Wed, 03 Oct 2012 21:58:07 +0200 From: Frank Louwers <[email protected]> To: Greg Hankins <[email protected]> CC: [email protected] Subject: Re: [f-nsp] CER FIB capacity > Greg Hankins wrote: >> Hi Rob, the CER routers use SRAM for the IPv4/v6 FIB instead of CAM, so >> for the CES/CER/CER-RT platforms the scalability is dynamic for all IP >> routes in the FIB (vs the MLX CAM architecture where we have to choose >> fixed partition sizes which can support a maximum number). > > > So there is no TCAM in the CER (not even the -RT)? How much slower is an > SRAM lookup than a TCAM lookup? > > Frank > -- > > Frank Louwers > COO Openminds > http://www.openminds.be/ > > Schrijf je in op onze nieuwsbrief: http://openminds.be/nieuwsbrief _______________________________________________ foundry-nsp mailing list [email protected] http://puck.nether.net/mailman/listinfo/foundry-nsp
