2.3.5 IP over Cable Data Network (ipcdn)

NOTE: This charter is a snapshot of the 41st IETF Meeting in Los Angeles, California. It may now be out-of-date. Last Modified: 18-Mar-98


Mike St. Johns <stjohns@corp.home.net>
Masuma Ahmed <masuma.ahmed@lmco.com>

Internet Area Director(s):

Jeffrey Burgan <burgan@home.net>
Thomas Narten <narten@raleigh.ibm.com>

Internet Area Advisor:

Jeffrey Burgan <burgan@home.net>

Mailing Lists:

General Discussion:ipcdn@terayon.com
To Subscribe: ipcdn-request@terayon.com
Archive: ftp://ftp.terayon.com/pub/ipcdn

Description of Working Group:

The goal of the IPCDN WG is to define how the Internet Protocol (IP) is to be supported on a Cable Television (CATV) Data Network. The working group will prepare a framework and requirements document describing a typical CATV infrastructure and how an IP based network might be architected to utilize this infrastructure. It will also address the service interface between IP and the CATV Data Network. The architecture document will discuss the technical details related to the differences between symmetric and asymmetric CATV Data Networks. A terms of reference document will also be published.

Currently, there are no standards available for supporting IP over a CATV Data Network. The IEEE 802.14 WG is chartered to specify the physical layer and data link layer protocols for the CATV Data Network. However, this does not address the issue of mapping higher level protocols onto the hybrid fiber coax (HFC) access networks. The IPCDN WG will define a specification of how IP is mapped onto HFC access networks. Both IPv4 and IPv6 will be addressed, although in separate documents. The following topics will be discussed:

multicast, broadcast, address mapping and resolution (for IPv4) and neighbor discovery (for IPv6).

The IPCDN WG will also address issues related to network management, especially as they concern HFC access networks. It is expected that other services (i.e. DHCP, RSVP, IPSEC, etc.) will operate unmodified. Also, depending on the capabilities provided by cable data network service, specific mappings of RSVP service classes to lower layer services might be desirable. If additional capabilities become necessary, these will be directed to the appropriate group.

The IPCDN WG will also keep informed on what other groups in the industry are doing as it relates to the work of this working group.

The WG is chartered to deliver the following set of documents:

- informational RFCs covering the framework, architecture, requirements and terms of reference for Cable Data Networks.

- an IPv4-over-HFC access network document covering the mapping of IP over RF channels, encapsulation and framing of IPv4 packets, IP to modem and/or PC address resolution, multicast, and broadcast.

- an IPv6-over-HFC access network document covering the mapping of IP over RF channels , encapsulation and framing of IPv6 packets, IP to modem and/or PC address resolution, neighbor discovery, multicast, and broadcast.

- a media-specific mib for managing HFC spectrum.

- a mib for managing cable data network service including management of IP over cable data network.

Goals and Milestones:

Sep 96


Post Internet-Draft on CATV data network architecture framework and terminology document.

Sep 96


Post Internet-Draft on IP over CATV data network service (IPC) document.

Dec 96


Meet at San Jose IETF meeting to review the two Internet-Drafts and finalize any changes to the architecture framework document.

Jan 97


Submit the architecture framework I-D to IESG for publication as an Informational RFC.

Feb 97


Post I-D on the cable data network MIB/architecture document.

Feb 97


Post I-D on the mailing list on the requirements document with pointers to the IETF standards.

Feb 97


Post I-D on the HFC spectrum management MIB/architecture document.

Apr 97


Begin the WG last call on the IP over CATV I-D.

Apr 97


Met at Memphis IETF to finalize review of the IP over CATV requirements, review the document on pointers to the IETF standards and the MIB/architecture documents.

Aug 97


Begin last call on the requirements document on pointer to the IETF standards and the MIB documents.

Aug 97


Submit the IP over CATV to IESG for publication as an RFC

Aug 97


Finalize review of the requirements document on pointers to the IETF standards and the MIBs.

Dec 97


Conclude Working Group.


No Request For Comments

Current Meeting Report

Minutes of the IP Over Cable Data Networks (ipcdn) Working Group

Chair: Mike StJohns
Mailing list: ipcdn@terayon.com
Requests: ipcdn-request@terayon.com

The IPCDN working group met for one session Wednesday night.

Mike StJohns talked briefly about a mechanism for managing multicast on cable modems which might also be applicable for use on ethernet (or other technology) switch ports. After discussion, it was agreed that the chair would discuss how to proceed with the area director.

Rich Woundy, American Internet, briefed on the structure of the Baseline Privacy MIB. This MIB should be handed over to the group shortly from the DOCSIS folks as a new contribution. Applicable documents describing the protocol can be found at http://www.cablemodem.com. [ipcdn-bpimib.ppt]

Jack Fijolek, 3Com, briefed the structure of the Telco Return MIB and also described the architecture of a cable modem system with telco return. This MIB has been published as an internet draft and will enter the work item queue for the group. [TRipcdn.ppt]

Mike Patrick, Motorola, brought the group up to date on the progress of a DOCSIS group working on QOS for the next point release of the cable modem standards. The new release will add substantial capability to providing differentiated services over a cable plant internet. [docsis_qos.ppt.pdf]

Mark Laubach, Com21, described the current progress of the 802.14 working group and indicated that it would probably be late this year until they complete their cable modem standard work item. Mark's draft on IP over 802.14 has been resubmitted to keep it active, but will be held in the queue pending 802.14 completing.

The chair reviewed the status of the active documents:

· The RF MIB has completed WG last call and will be submitted to become an RFC and proposed standard. [Note: Chair is working with document editor to resolve some editorial issues]
· The CM MIB is ready for WG last call. Chair to announce.
· The architecture document will be re-issued as an Internet Draft and the forwarded to become an Informational RFC.
· The IP over MCNS needs WG review, and will be forwarded by next IETF for WG last call.
· The IP over 802.14 is on hold pending 802.14 completing their work.
· The Telco Return and Baseline Privacy MIBs will enter the work queue for the working group.


DOCSIS CMTRI Architecture
Baseline Privacy Interface MIB

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