[j-nsp] J4300 Specs?

[info at beprojects.com]

Depends on packet size and what they are using it for.  I had a J4300 
and J2300 for testing and I spent a lot of time beating up my Juniper SE 
about it.

As far as memory, the J2300 and J4300 can only use 512M right now, but 
they are supposed to be certified with 1Gig at some point.  Running two 
full BGP feeds (140k routes each) will use up almost all of the 512M, so 
as of right now, neither one is useful for even two T1 BGP feeds (unless 
you get partial routes).  A J6300 can handle a gig of memory, so it will 
work.

As far as throughput, with 100 byte packets, we were pushing about 
30Mbps through the J4300 and about 20Mbps through the J2300 (neither cpu 
appeared to be taxed at all).  If you jumpt up to 250 byte packets, you 
can get 50-60Mpbs through the J4300.  One thing to keep in mind is that 
there are performance differences between the built-in ports and 
additional FE's (I can't remember which was which, but you'd get 
different numbers if you went from a built-in to an additional FE versus 
going between the built-in ones).

We didn't do much with filters and such, but according to Juniper, it 
isn't supposed to alter the numbers at all.  If you do get one, check 
the ping numbers to the box and through the box.  They are very goofy. 
There is a bug in the pings to the box that I've seen on Juniper's 
website, but nobody ever gave me a good explanation as to why pings 
through the box are slow, other than "ping isn't a good measure of 
performance".

Peder


Tom (UnitedLayer) wrote:
> I've heard lots of wild speculation about the 4300, and I'm looking for 
> someone who knows more than just myth :) I found an article that says a 
> J4300 is looking at something like 16Mbps thruput? Thats not really gonna 
> cut it heh.
> 
> I can't seem to find any PPS numbers on Juniper's website, and I have a 
> customer who's very interested in getting one.
> 
> I need a Lab/Testing router, so I might just be willing to trade my M5 in 
> for one :)
> 
> ---
> Tom Sparks                                                        UnitedLayer
> 24x7 NOC Support : 415-294-4111                                       AS23342
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