[j-nsp] Difference MX DPC-R / DPCE-R

[Richard A Steenbergen]

On Mon, Dec 12, 2011 at 05:05:20PM +0100, Nicolaj Kamensek wrote:
> Hello list,
> 
> can anyone name the major differences between those modules? DPC are 
> becoming available in the used market for small money and I am wondering 
> if a DPC non-E is good enough for a classical access router environment 
> with 30.000+ ARP entries and a growing number of IPv6 neighbours but 
> nothing fancy overall.
> Since it's hard to find any facts about this:
> 
> - does it matter memory-wise if the requirements above are applied to 
> just one routed port or to multiple switched/routed ports?
> - do bundled links still double the amount of memory required?

Well since nobody has answered this one correctly I guess I'll do it... 
The only difference between DPC and DPCE is the size of the microcode on 
the EZChip ASIC used for L2 framing (1.5KB vs 6KB instruction space). 

Almost no features require the larger microcode space, so you should be 
pretty safe... When the DPCs first came out, almost nothing used the 
EZChips at all, and even over the last couple years the only thing I've 
seen that doesn't like running on the Rev A's is PBB (Provider Backbone 
Bridging). Maybe you can get someone from Juniper to provide a more 
extensive list, but it's pretty safe to assume that nothing about the 
config you mentioned above will be impacted by DPC non-E's at all.

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
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