[j-nsp] Adaptive services(1)

[Richard A Steenbergen]

On Mon, Sep 25, 2006 at 09:36:40PM +0200, Jonas Frey wrote:
> Speaking of E-FPC's, anyone got a link to a list regarding differences
> between E-FPC and FPC? I once a page with details but it seems i lost
> the link.
> I know there are differences on QoS queues and memory, but i dont recall
> the details.

Besides the obvious published difference of more QoS queues supported, the 
other differences I've run across are:

* You need FPC-E to support certain types of PICs period. For example I 
  have a 1GE-SFP-QPP which will only run on an FPC-E (well, it will run 
  on an FPC, but it can't RECEIVE .1q tagged trafic properly, tx and 
  untagged seems to work, and the offical documentation position is that 
  it requires FPC-E).

* As the code and features have grown over the years, the microcode space 
  on the original FPC has run low. The FPC-E's have more space to let you 
  run "all combinations" of PICs (ATM, SONET, Ethernet, AS etc) on a 
  single FPC.

* The change between B-Chip 2.0 and 3.0 increased the amount of packet 
  header that can be rewritten. For example on FPC non-E if you run an 
  MPLS l2circuit OVER a .1q tagged circuit and leave control-word on, you 
  will exceed the L2RW capacity and the router will crash and burn (on 
  M160 it corrupts the FIB royally :P).

And probably a great many more. If there isn't a comprehensive list of 
changes published on Juniper's website (and somehow I doubt they will ever 
publish the feature differences in the B-Chip versions etc), I'd really 
like to get this onto a juniper.cluepon.net page. Perhaps other people can 
add to this list, or someone from Juniper can describe the changes in more 
detail.

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)