The primary attraction to using provider independent space is that an organization is not tied to a specific provider. An organization that is using provider independent space can change providers without having to go through and renumber its entire network when the provider address space changes. Provider independent (PI) space also allows an organization to connect to multiple service providers with a single IPv6 address block. These multiple connections provide resiliency and redundancy in case a particular service provider network has issues.The PI model also allows an organization to deploy and manage a single block of address space without worrying about potential source address selection issues. If an organization was multihomed and used the provider assigned (PA) model, it would have to manage two address blocks at a minimum. The end systems would get assigned multiple addresses (for instance, one from each service provider (SP) block), which could lead to higher address manag
http://www.ebrahma.com/2013/09/ipv6-multi-homing-with-provider-independent-addressing/Labels: eBrahma