On Tue, 08 Sep 2015 19:40:44 -0000, Josh Moore said: > The question becomes manageability. Unique VLAN per customer is not always > scalable. For example, only ~4000 VLAN tags. What happens when you have more > than that many customers?
If you're hanging 4K customers off the same switch, you probably have bigger issues than running out of VLAN tags... > We are talking very, very, small customers here. SOHO to say the most. > /64 should be more than sufficient for their CPE router. A Linksys WNDR3800 running CeroWRT (and probably OpenWRT by now) will prefer to create multiple /64's - one for the 4 wired ports, one for private access on the 2.4G radio, one for guest access on the 2.4, and another private/guest pair on the 5G radio. So there is CPE gear out there now that can blow through 5 /64s by default, and more if you enable VLANs. A /56 allocated via DHCPv6-PD would be a *minimum*. And prefixes are cheap, so you may as well hand them a /48, just in case they have a second WNDR3800 at the other end of the building for coverage - because that one will then ask the upstream one for a -PD allocation. So if you give the CPE a /48, it can keep a /56 for itself, and hand the downstream a /56, and they can each allocate /64s as needed. And remember - prefixes are cheap and plentiful, so don't bother with /52 or /60, just split on 8-bit boundaries to make life easier for yourself...
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