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draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 Judgement of IPv4/IPv6 sites Whether the sites is IPv6 can be identified by the address of the interface between CE and PE, then PE can set the related fields in If-V6-Site attribute when distributing the VPN routes across backbone, and whether the remote site is IPv6 can be identified by If-V6-Site attribute attached to VPN routes received. If-V6-Site (TLV) Extended Community Attribute 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |T| length | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+-+-+-+| | IPv6 Route1… | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- | IPv6 Routen… | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |