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2. Changes Compared to RFC 5549

This document introduces two significant changes compared to [RFC5549]:

  • In [RFC5549], when AFI/SAFI <1/128> is used, the next-hop address is encoded as an IPv6 address with a length of 16 or 32 bytes. To accommodate all existing implementations and bring consistency with VPNv4oIPv4 and VPNv6oIPv6, this document modifies how the next-hop address is encoded. The next-hop address is now encoded as a VPN-IPv6 address with a length of 24 or 48 bytes (see Sections 3 and 6.2). This change addresses Erratum ID 5253 ([Err5253]). As all known and deployed implementations are interoperable today and use the new proposed encoding, the change does not break existing interoperability.

  • This document allows AFI/SAFI <1/129> (IPv4 multicast) to use an IPv6 underlay using similar encoding and procedures to AFI/SAFI <1/128> (see Sections 3 and 6.3).

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