ISP IPv6 Deployment Scenarios in Broadband Access Networks

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RFC 4779          ISP IPv6 Deployment Scenarios in BB       January 2007


   In all the scenarios listed above, the tunnel selection process
   should consider the IPv6 multicast forwarding capabilities if such
   service is planned.  As an example, 6to4 tunnels do not support IPv6
   multicast traffic.

   The operation, capabilities, and deployment of various tunnel types
   have been discussed extensively in the documents referenced earlier
   as well as in [RFC4213] and [RFC3904].  Details of a tunnel-based
   deployment are offered in the next section of this document, which
   discusses the case of Cable Access, where the current Data Over Cable
   Service Interface Specification (DOCSIS 2.0) [RF-Interface] and prior
   specifications do not provide support for native IPv6 access.
   Although Sections 6, 7, 8, and 9 focus on a native IPv6 deployments
   over DSL, Fiber to the Home (FTTH), wireless, and PLC/BPL and because
   this approach is fully supported today, tunnel-based solutions are
   also possible in these cases based on the guidelines of this section
   and some of the recommendations provided in Section 5.

5.  Broadband Cable Networks

   This section describes the infrastructure that exists today in cable
   networks providing BB services to the home.  It also describes IPv6
   deployment options in these cable networks.

   DOCSIS standardizes and documents the operation of data over cable
   networks.  DOCSIS 2.0 and prior specifications have limitations that
   do not allow for a smooth implementation of native IPv6 transport.
   Some of these limitations are discussed in this section.  For this
   reason, the IPv6 deployment scenarios discussed in this section for
   the existing cable networks are tunnel based.  The tunneling examples
   presented here could also be applied to the other BB technologies
   described in Sections 6, 7, 8, and 9.

5.1.  Broadband Cable Network Elements

   Broadband cable networks are capable of transporting IP traffic to/
   from users to provide high speed Internet access and Voice over IP
   (VoIP) services.  The mechanism for transporting IP traffic over
   cable networks is outlined in the DOCSIS specification
   [RF-Interface].

   Here are some of the key elements of a cable network:

   Cable (HFC) Plant: Hybrid Fiber Coaxial plant, used as the underlying
   transport

   CMTS: Cable Modem Termination System (can be a Layer 2 bridging or
   Layer 3 routing CMTS)



Asadullah, et al.            Informational                      [Page 9]