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Title : BGP Community for PA Multihoming
Author(s) : I. van Beijnum
Filename : draft-van-beijnum-v6ops-pa-mhome-community-00.txt
Pages : 8
Date : 2006-9-11
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 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.
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