[c-nsp] Broadband Aggregation/Termination

[Andrew Gambell]

Hi Cassidy,

Having run PPPoE and DHCP based ISG session on ASR1K (and other platforms) I would highly recommend sticking with PPPoE.

Session maintenance/timeout is a pain in the arse with DHCP with the only real option to rely on the DHCP lease, if you don’t use a low lease time this makes router maintenance or moving subscribers between devices a long outage for customers while waiting for CPE to request a new lease. Whereas with PPPoE we have keep alives at typically 30-60 seconds which means session tear down and come back quickly.

ISG IPv6 only allows IPv6 unclassified IP or PPP based IPv6 sessions, problem with unclassified IP is how do you reconcile that back to a subscriber account?

We also use PPPoE IA (Intermediate Agent) to insert a circuit id (much like option 82 for DHCP) which allows us to authenticate customers based on this circuit Id rather than username/password. (PPPoE IA insertion is supported on ME series switches and some Catalyst)

HTH

--Andrew Gambell




On 19/04/2017, 8:53 AM, "cisco-nsp on behalf of CBL" <cisco-nsp-bounces at puck.nether.net on behalf of 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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