[j-nsp] TCAM full on EX8200?

[Joel jaeggli]

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
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