[j-nsp] ME design from JNPR

[Alex Lemk]

Hi,

Our company is going to deploy ME  network for providing broadband
services for residential customers.  JNPR proposes the design with few
MX480 used as a core and E120 as a  BRASes.  This model looks like a
BRAS centric, because all customer ME rings will be connected to E120
and all traffic (including VoD,Multicast and Business) will flow
through the BRASes also.

During the design analyze I found  few possible issues, which were not
highlighted by JNPR:

- All customers are connected to four E120. There are not topology
redundancy, i.e. each ME access ring connected only to single E120. If
this E120 fails, then all connected customers will lost their
services. JNPR claims that they know how to make topology redundancy
with addinf second BRAS, but couldn't explain how to provision it :)
Has anybody seen such configuration before?

- Another question is ISSU support. JNPR claims again, that their
BRASes have a support of this feature, but I didn't find any mentions
about ISSU in JunOS documentation. Is it true ? Is it full ISSU with
upgrades between major releases ?

- Is there another well known weaks of such design ?

- I didn't find  public reports about MX480 and E120. Can somebody
unicast me about his experience with these boxes ?

====
Alex