[c-nsp] Router for wholesale DSL aggregation over L2TP

[Ross Halliday]

If you're running those subscribers on an NPE-G1 right now then you should be fine. If you scale up you have the option of dumping an NPE-G2 in there. No idea about licensing. As far as configuration goes there should be a pile of examples out there on how to build an L2TP LNS. Here I've only dealt with L2TP in a LAC role as our Redback routers handle the final step.

If you weren't already aware, your Ethernet path will need to be able to accommodate a higher MTU for the L2TP-encapsulated stuff. This won't be a problem with the NPE-Gx's onboard ports.

Are you running PPPoE for your wireless subs as well?

Cheers
Ross
(Independent ISP that grew a little bigger)


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Scott Lambert
> Sent: Wednesday, January 16, 2013 1:28 PM
> To: cisco-nsp
> Subject: [c-nsp] Router for wholesale DSL aggregation over L2TP
> 
> Windstream is changing us over from our ATM DS3 to ethernet handoff
> for DSL aggregation.
> 
> We are looking to get a different router to take the ethernet handoff
> in another location.  Our current router is a 7204VXR with NPE-G1.
> 
> I've been looking at what might be available inexpensively.  It
> looks like a 3845 is specified to handle 1200 or so L2TP connections.
> We have around 800 DSL subscribers.  We can add more subscribers
> after we get the additional bandwidth available on the ethernet
> handoff.  But we don't expect to grow the DSL side of the business
> very much.  We are mostly focused on fixed point wireless at this
> point.  I believe we will only need 50 to 100Mbps of Internet,
> no dynamic routing protocols.
> 
> For less than $1000, there are 3845s available on eBay.   If the
> 3845 will do the trick, I can get a spare.
> 
> The 3945 is around $5000 - $7000 on eBay.  That's not what we call
> inexpensive.  It's tough being a small independent ISP.  I just
> haven't been able to google up the rated L2TP specs for the 3900
> series.
> 
> Am I even looking at the correct range of hardware for our wholesale
> DSL aggregation?
> 
> We have not done the L2TP handoff before.  Do I need to be careful
> to make sure the software is licensed for a particular feature set?
> 
> Should I just do it on my 7204VXR?  We could afford to call a
> maintenance window for the hour or two necessary to transport it
> to the new location if needed.  Everything would need to go perfectly
> and that never happens... :-)
> 
> --
> Scott Lambert                    KC5MLE                       Unix
> SysAdmin
> lambert at lambertfam.org
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