166 n Handbook of IPv4 to IPv6 Transition
8.3 IPv6 Operations Working Group:
Transition Scenarios for ISPs
As mentioned, this summary is based on [RFC4029]. Overall, the RFC contains
many similar issues to the NREN document. (Note that members of 6NET have
contributed to the RFC.) e RFC begins by describing stages of transition that an
ISP network may go through during transition and notes that an ISP may transi
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tion different elements of its network at different times (e.g., it may start by offering
IPv6 in IPv4 tunnels to early-adopter customers ahead of a full dual-stack service).
e RFC identifies four stages:
1: Launch: e ISP obtains an IPv6 SubTLA address.
2a: Backbone: e ISP upgrades its backbone to carry IPv6 traffic.
2b: Customer connec ...