[c-nsp] Broadband Aggregation/Termination

[Shawn L]

We do "standard" DHCP, (no ppoe) on mostly DSL and fiber to the home subs.

 For older dslams that do ATM only we have cisco 7200 routers with ATM
interfaces that do the ATM to IP conversion (cheap, plenty of horsepower
for the task).

On the newer stuff that can take IP in directly we use cisco 3600 series
switches (we route to them for smaller sites), bring the traffic in on a
vlan with a DHCP Helper address configured.  That way we can have a couple
of DHCP serviers in our core that handle the requests from everywhere
instead of a DHCP server @ each site.

You can also use the router / switch as a DHCP server (which we've done at
small sites).  Also tried having centralized DHCP servers listening on
multiple vlans which works, but then you need to trunk all traffic back to
the core.  Not really idea.  We eventually settled on using DHCP Helper
addresses and a couple central dhcp servers.  Haven't really deployed much
IPv6 yet, but our thinking at the time was that this would also make that
easier.

We break everything down to a /24, so for sites that need more than one, we
configure a secondary ip on the interface and add another /24 to the DHCP
server.

We rate limit through profiles on the DSLAM itself instead of on the
network gear.

On Tue, Apr 18, 2017 at 7:23 PM, CBL <alandaluz at gmail.com> wrote:

> Hi guys,
>
> What are you doing for (ethernet) Broadband Aggregation and Termination?
> PPPoE, DHCP, Other?
>
> We've been doing PPPoE on some ASR1k's for years. Sure, it's fine, but
> customers with new routers have to be setup for PPPoE credentials where
> DHCP would work out of the box, and they never remember them requiring a
> call.
>
> We've been looking at DHCP, perhaps using Cisco's ISG. Does anybody run ISG
> now?
> How does it work with IPv6?    If you're not using ISG, what do you do to
> rate-limit customers and track usage?
>
> If you are using DHCP, how are you aggregating X number of VLANs, each with
> different subscriber counts so you don't have to have a matching X number
> of different sized DHCP pools to match your VLAN sub interfaces?  I love
> how I can just throw another /24 or two at a "nearing capacity" PPPoE pool
> on our ASR1k's and problem solved for a while.
>
> I'd love to pick the brains of this community to see how you're doing your
> customer termination, and what I'm doing wrong or could be doing better.
>
> Thanks,
>
> Cassidy
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