Abstract: When an organization wants to connect to the internet using two or
more Internet Service Providers (multihoming), this is usually done by
setting up BGP routing between the organization in question and each
of its ISPs. For this, the multihomed organization needs a block of
address space. This can either be a provider independent (PI) address
block that belongs to the organization, or a block out of the provider
aggregatable (PA) address space of one its ISPs. With IPv4, an
address block of at least /24 will generally be suitable for
multihoming, whether its origin is PI or PA. However, until now, ISPs
were encouraged to only accept /32 and shorter prefixes from IPv6 PA
space, while end-users generally receive a /48. This makes multihoming
with PA address space in IPv6 very difficult. This memo describes a
new well-known BGP community attribute for tagging prefixes used for
multihoming with PA space in order to facilitate filtering, rather
than filter based on prefix length alone.
Publication Year: 2006
Publication Date: 2006-09-28
Language: en
Type: article
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