On 10/14/11 03:08 , Phil Mayers wrote: > On 13/10/11 20:21, Richard A Steenbergen wrote: > >> EX8200 uses SRAM for forwarding lookups, and TCAM for firewall >> filtering. SRAM is perfectly capable of doing lookups at these speeds, >> and infact is a lot more flexible than TCAM, whereas TCAM is actually >> much better suited for doing high speed packet filtering. > > On that topic; I'm familiar with how TCAM can be used to accelerate > routing lookups, but less so with SRAM. Is the SRAM used to implement a > "simple" lookup table/tree, or does SRAM have some special properties > that enable it to do fast routing lookups?
Tree based longest match... one such discussion (by a vendor that uses tcam for the most part) http://www.nanog.org/meetings/nanog39/presentations/fib-hankins.pdf and it's not just sram of course RL-DRAM2 is also used (by for example the MX) > Just curious, if anyone has any pointers to how SRAM is actually used > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp