[c-nsp] DOCSIS 3.0 & PPPoE/L2TP compatibility

[Brian Mengel]

We run a mix of Cisco and Arris CMTS in our network and have found
both to share the same feature set (at least for the features we
need).  If there is a problem with L2TP its not going to be the result
of the DOCSIS 3.0 upgrade but rather an issue with the Arris CMTS.  I
would recommend getting a technical contact at Arris from your partner
MSO and explaining your situation to them and seeing what they can
provide as a resolution.  Its possible that the Arris outright doesn't
support L2TP, but I suspect there may be other things going on.

On Sat, Jul 28, 2012 at 6:48 PM, iptech <iptech at northrock.bm> wrote:
> Hi,
>
> No takers?
>
> Would really appreciate some feedback/pointers.
>
> Thank you.
>
>
> On 7/27/2012 2:57 PM, iptech wrote:
>>
>> Hi,
>>
>> We are a small ISP and have a setup in place with the local cable company
>> for terminating their users via L2TP for Internet access. However they have
>> just announced to us that they are moving to a DOCSIS 3.0 compliant setup,
>> and this standard no longer supports PPPoE via L2TP, and can now only offer
>> PPTP for terminating with us.
>>
>> We have already begun replacing our Cisco 7206VXR LNS devices with Cisco
>> ASR 1Ks and as you will be aware the older 7206 can do both L2TP and PPTP,
>> whereas the ASR1k can do only L2TP.
>>
>> I do not have any experience in the cable arena, but from what I have read
>> in the DOCSIS standards, each version has maintained backwards
>> compatibility, therefore I am very surprised our CableCo has claimed they
>> cannot do PPPoE/L2TP anymore.
>>
>> The CMTS they are currently using is a Cisco, and now they are moving to a
>> new ARRIS CMTS. I have not been able to find any information on this device
>> and what it can do or not.
>>
>> With the ASR1K marked as the natural upgrade path for LNS functions,
>> therefore I cannot believe that it is not fully compatible with DOCSIS 3.0.
>>
>> From what I can tell the only way to accommodate the new CMTS PPTP
>> connections will be to terminate them on the legacy 7206VXR, which at the
>> end of the day is a backwards step.
>>
>> I would greatly appreciate if anyone can give me any pointers and/or
>> suggestions on this matter, so I can understand it and move it forward.
>>
>> FYI: The driver for the CMTS upgrades is to offer higher bandwidth access
>> speeds 15mb-20mb.
>>
>> Thank you.
>>
>> _______________________________________________
>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>>
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/