Joe Abley wrote:
There are two working options for multi-homing in IPv6 today:
1. Obtain PI IPv6 space, and do what you do with IPv4 PI space. This option is open to all ISPs, per current APNIC policies. This doesn't apply to end-sites in the APNIC region, though (ARIN policies differ), which is what you're talking about. I mention it for completeness.
Fortunately, there is a policy proposal under action with APNIC right now to allow for /48 assignments for multihoming. http://www.apnic.net/docs/drafts/draft-ipv6-address-policy-v004.txt (in particular, section 5.8.1). http://www.apnic.net/docs/policy/proposals/prop-035-v002.html for the proposal status.
2. Take one PA assignment from each of your upstreams, assign an address from each of those PA blocks to each customer, and let the customers decide which address to use. This is the current IETF- blessed multihoming approach.
There work going on at the IETF to provide additional multihoming mechanisms, principally because operators were underwhelmed with (2) above, and because there are scaling concerns with (1). However, I don't think it's accurate to say that there's no effective end-site multi-homing in IPv6.
"Underwhelmed" is the polite way of putting it. aj.