[c-nsp] Migrating to a 7200 for DSL aggregation

[Frank Bulk]

You haven't mentioned current and anticipated PPS requirement.  If it's
really just one DS3 then a 7200VXR with NPE-G2 should be fine, otherwise if
your needs were 100+ Mbps and growing, the ASR1K, I'm told, is a good box.

We use 12.2(31)SB18 -- the latest in that series, but only because of a
resource bug that TAC said *may* be resolved in the latest release.  Came
across as "just try". ;)

I haven't implemented any MLPPP myself, but as your research in the archives
has shown, it's not all roses.  I'm guessing ADSL2+ pair bonding or VDSL2
aren't options?

Frank

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Andy Dills
Sent: Tuesday, August 17, 2010 2:03 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Migrating to a 7200 for DSL aggregation


For the last decade, we've been using a Redback SMS 500 to terminate our 
DSL customers, delivered via ATM DS3.

Recently, however, a few customers (as well as the partners of the 
company) have expressed a desire to bond 2 DSL circuits.

Unfortunately, we've discovered that the customers who have Comtrend 
modems cannot negotiate LCP with the Redback when ppp multilink is 
enabled...after working through this with Comtrend, they demonstrated that 
the Redback is violating RFC 1990, and because of this and the fact that 
the Comtrend modem didn't support MP, it was unable to negotiate LCP.

At the same time, we're starting to get a little nervous about relying on 
Redback as a platform, given that all the equipment we currently use is 
EOL and Redback has long since been acquired. We have spares, but clearly 
it's a deadend.

So, we're investigating migrating to a 7200(VXR) platform for DSL 
aggregation.

I was curious about a couple of things:

1) Given that Verizon delivers all of the DSL connections on a 
region-based series of UBR PVCs, what is the best way to bond two DSL 
circuits, given that they would not be on private PVCs? Is MLPPP possible 
in that configuration? Or would I need to do CEF per-packet? Given the 
archives on this list, I'm leaning toward per-packet CEF via radius 
assigned routes. I know we won't get ideal performance, but it should be 
an improvement over a single DSL connection nonetheless.

2) What IOS do people suggest for ATM DSL aggregation...the router won't 
be doing anything else other than OSPF.

Thanks,
Andy

---
Andy Dills
Xecunet, Inc.
www.xecu.net
301-682-9972
---
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