> The 2320 fits the bill perfectly (although has an extensive feature
> list most of which we will never use in this setting) - and can be
> upgraded to 16 additional ethernet ports as well. How I missed it is
> utterly beyond me. I might have glossed over it as as having "only"
> four ethernet ports.

It seems everything Juniper on the low-end is software(and something + a router) - so Juniper's product lines get pretty muddled in terms of distinguishing factors(and you don't need what few there are).  It also doesn't help that everything you want to look at is contained in monolithic pdf datasheets which seem to randomize the location of things between lines.  Anyway, something like an SRX240 might do as well($2,600ish), although those are "geared" more towards security and don't have the port expansion options(but come with 16 fixed ports).  
 
The only reasons I bring it up are that an SRX240 includes the ports you need out of the box for less than a J-Series + PIM, and the SRX240 is actually rated at 200K pps(64K packets) versus the J2320 which is 175K pps.  You might be able to get more out of the J2320 by switching it into packet-mode, but I'm not positive on that so whether that 200K pps figure is a hard limit for you or not probably factors in as does whether you need future expansion options.  I'd talk to a Juniper sales engineer or at least ask on their forums before pulling the trigger on anything.
 
> We'll likely end up using a pair of Juniper EX3200 switches, as has
> been suggested to me off list.

 
I'm curious to hear how the EX3200s do and how they stack up against, say, Cisco 3560-X's if you'll have both and wouldn't mind mailing me off-list.  I may find myself in need of some fixed-port switches next-year, but I'm still a little paranoid about switching to Juniper for that, as much as I love their routers.

--Nick

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