And then you need MACFF to overcome the split-horizon to that customers in the same subnet can talk to each other. =) Frank -----Original Message----- From: Mark Tinka [mailto:mark.tinka@seacom.mu] Sent: Thursday, February 06, 2014 8:09 AM To: nanog@nanog.org Subject: Re: SIP on FTTH systems On Thursday, February 06, 2014 03:51:51 PM Anders Löwinger wrote:
This is a deep hole, and basically does not work with IPv6.
You need a bunch of stuff, proxy ND, proxy DAD, DHCPv6 inspection, RA guard and more. One VLAN per customer and a separate multicast is much simpler.
If you have a reasonably intelligent AN (like some of today's Active-E devices), you can create so-called split horizons on the same bridge domain (VLAN, really) where customers will only communicate via the upstream BNG at Layer 3. At Layer 2, even though they are all sitting on the same VLAN, there is no inter-communication between them. I've also know Huawei OLT's support these split horizons too.
Or do something bold, run L3 at the edge :)
BNG's are too big to distributed that deeply, even in distributed BNG designs. This would get costly. Cheap switches that have decent IP/MPLS support are mostly geared toward Metro-E deployments, i.e., business-grade services. So they are quite poor with regard to susbcriber management features and capabilities. Mark.