Title: IPv4 and IPv6 Infrastructure Addresses in MCAST-VPN Routes
Abstract: To provide Multicast VPN service, a provider edge router originates
MCAST-VPN BGP routes. These routes encode addresses from the
customer's space as well as addresses from the
provider's space. The customer's space may be
either IPv4 or IPv6. Independently, the provider's space
may be either IPv4 or IPv6. The MCAST-VPN BGP routes always contain
an address family field that specifies whether the customer
addresses are IPv4 addresses or whether they are IPv6 addresses.
However, there is no field that explicitly specifies whether the
provider addresses are IPv4 addresses or whether they are IPv6
addresses. The existing specifications do not explicitly say how to
determine whether a given provider is IPv4 or IPv6, and there
are differing precedents about the method used to encode IPv4
addresses in messages that also contain IPv6 addresses. This document
removes any ambiguity by specifying that MCAST-VPN routes always
encode provider IPv4 addresses as four-octet addresses, and that the
distinction between an IPv4 and an IPv6 is signaled
solely by the length of the field.
Publication Year: 2010
Publication Date: 2010-06-11
Language: en
Type: article
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