2.3.13 Internetworking Over NBMA (ion)

NOTE: This charter is a snapshot of the 40th IETF Meeting in Washington, DC. It may now be out-of-date. Last Modified: 24-Oct-97


A. Malis <malis@casc.com>
George Swallow <swallow@cisco.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:ion@nexen.com
To Subscribe: ion-request@nexen.com
In Body: In Body: subscribe
Archive: ftp://ftp.nexen.com/pub/ion

Description of Working Group:

Note: This Working Group is jointly chartered by the Routing Area. The Routing Area Director: Joel Halpern (jhalpern@newbridge.com)


The Internetworking Over NBMA Working Group was formed to combine the work of two previous working groups, IP Over ATM (ipatm) and Routing Over Large Clouds (rolc), because these two groups were often working very closely together on similar, if not identical, problems and solutions. The group will be evolutionary, not revolutionary; it will continue the work in the previous groups on the NBMA Next Hop Resolution Protocol (NHRP), IPv4 over ATM, and IPv6 over ATM.


This WG will focus on the issues involved in internetworking network layer protocols over NBMA (non-broadcast multiple access) subnetwork technologies, such as ATM, Frame Relay, SMDS, and X.25 private and public networks. The group will endeavor to make all its solutions applicable to the entire range of network layer protocols and NBMA subnetworks. We recognize, however, that there will be cases where specific optimizations to IPv4, IPv6, and particular subnetwork technologies will result in better service to the user.

The group will focus on protocols for encapsulation, multicasting, addressing, address resolution and neighbor discovery, interactions with and optimization of internetworking-layer routing protocols when run over NBMA subnetworks, and protocol-specific network management support, as appropriate. The working group will submit these protocols for standardization.

The working group may also produce experimental and informational documents, including "Best Current Practices" guidelines, as required.

For ATM, the WG will continue the ipatm WG's transition from the LIS model described in RFC 1577 to the generalized NHRP model developed by the rolc WG, including a transition plan for existing networks.

The working group will coordinate its activities with the following other working groups:

1) Integrated Services over Specific Lower Layers (issll), for coordinating Quality of Service (QoS) issues and the implementation of IP integrated services capabilities (RSVP, the service models, etc.) over NBMA networks.

2) IP Next Generation (ipng), for IPv6 over ATM coordination.

The working group will also coordinate its work with other relevant standards bodies (e.g., ATM Forum, Frame Relay Forum, ANSI T1S1, ITU-T) and make recommendations to these organizations regarding the requirements for IP internetworking where the current published subnetwork standards, practices, or functionality do not meet the needs of internetworking.

The working group will not develop subnetwork layer standards.

Goals and Milestones:

May 96


Begin work on internetworking over Frame Relay SVCs (RFC 1490 extension), using NHRP for address resolution.

Jun 96


Revise drafts on NHRP, 1577 revisions, server synchronization (applicable to both NHRP and ATMARP), multicast server and broadcast for ATM, IPv6 neighbor discovery, ATM UNI 4.0 signaling (RFC 1755 update), Classical IP and NHRP MIBs, NHRP applicability, ATMARP to NHRP transition plan, and router-router NHRP.

Sep 96


IAB and IESG review of WG Status, and plans. This meeting will be scheduled to occur during SIGCOMM '96.

Dec 96


Submit NHRP, RFC 1577 revisions, and server synchronization to the IESG as a Proposed Standard, complete the ATMARP to NHRP transition plan and NHRP applicability statement, revise drafts on multicast server and broadcast for ATM, IPv6 neighbor discovery, classical IP and NHRP MIBs, router-router NHRP, ATM UNI 4.0 signaling (RFC 1755 update)

Mar 97


Submit IPv6 neighbor discovery, classical IP and NHRP MIBs, router-router NHRP, ATM UNI 4.0 signaling (RFC 1755 update), multicast server and broadcast for ATM, and NHRP for Frame Relay SVCs to the IESG.



Publish the IP over ATM Framework document (now RFC 1932), submit the MARS draft to IESG as a Proposed Standard.


Request For Comments:







Issues affecting MARS Cluster Size



Multicast Server Architectures for MARS-based ATM multicasting.



Management Information Base for Frame Relay DTEs Using SMIv2



IP Broadcast over ATM Networks

Current Meeting Report

Minutes of the Internetworking over NBMA (ion) WG

Internetworking over Non-broadcast Multiple Access Networks (ION) met Wednesday, December 10th, from 9:00 to 11:30. The meeting was chaired by Andy Malis and George Swallow. There were 157 in attendance.

I. Administrative

The ION list has moved. The new host is Sun Microsystems. The mailing list information is now:

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II. Status and Work Plan

Andy Malis presented the status of new RFCs and all ION drafts. This lead into a discussion of the current work plan. The discussion resulted in an updated work plan.

For the minutes are captured the status of all documents which have passed Working Group last call, followed by the updated work plan.

New RFCs (since Munich):

RFC 2115, Management Information Base for Frame Relay DTEs, Caralyn Brown, Fred Baker, 9/16/97 (Draft Standard)

RFC 2191, VENUS - Very Extensive Non-Unicast Service, Grenville Armitage, 9/10/97 (Informational)

RFC 2226, IP Broadcast over ATM Networks, Timothy Smith, Grenville Armitage, 10/28/97 (Proposed Standard)

Awaiting RFC publication:

draft-ietf-ion-ipatm-classic2-03.txt, Classical IP and ARP over ATM, 10/16/97 (Proposed Standard) Reason: Awaiting the Classical IP MIB

draft-ietf-ion-sig-uni4.0-05.txt, ATM Signaling Support for IP over ATM - UNI Signaling 4.0 Update, 11/12/97 (Proposed Standard)

Drafts in IESG Review:

draft-ietf-ion-fr-update-03.txt, Multiprotocol Interconnect over Frame Relay, 5/8/97 (Standard) Awaiting implementation report and new security section

draft-ietf-ion-inarp-update-01.txt, Inverse Address Resolution Protocol, 5/8/97 (Draft Standard) Awaiting implementation report and new security section

draft-ietf-ion-mars-mib-04.txt, Definitions of Managed Objects for Multicast over UNI, 12/2/97 (Proposed Standard)

draft-ietf-ion-mib-04.txt, Definitions of Managed Objects for Classical IP and ARP Over ATM Using SMIv2, 7/15/97 (Proposed Standard) Completed IETF Last Call on 11/10/97

draft-ietf-ion-nhrp-appl-02.txt, NHRP Protocol Applicability Statement, 7/25/97 (Proposed Standard) Completed IETF Last Call on 11/20/97

draft-ietf-ion-scsp-02.txt, Server Cache Synchronization Protocol (SCSP), 10/30/97 (Proposed Standard) Completed IETF Last Call on 11/20/97

draft-ietf-ion-scsp-nhrp-02.txt, A Distributed NHRP Service Using SCSP, 10/29/97 (Proposed Standard) Completed IETF Last Call on 11/20/97

draft-ietf-ion-transition-02.txt, Classical IP to NHRP Transition, 7/3/97, (Informational) Completed IETF Last Call on 11/20/97

draft-ietf-rolc-nhrp-12.txt, NBMA Next Hop Resolution Protocol (NHRP), 10/30/97 (Proposed Standard) Completed IETF Last Call on 11/20/97

Updated ION Work Plan (by submission date):

Dec 97 Using the MARS model in non-ATM NBMA networks (Informational)

Jan 98 Update for RFC1490 (Standard)
Update for RFC1293 (Draft Standard)
Intra-LIS IP multicast among routers over ATM using Sparse Mode PIM (Proposed Standard)
Distributed MARS Service Using SCSP (Informational)

Feb 98 Submit IPv6 over NBMA, ATM, and FR drafts (PS)

Mar 98 NHRP MIB (Proposed Standard)
ILMI-Based Server Discovery for ATMARP (Proposed Standard)
ILMI-Based Server Discovery for MARS (Proposed Standard)
ILMI-Based Server Discovery for NHRP (Proposed Standard)
ION security (PS)

May 98 SCSP for ATMARP (Proposed Standard)

Dec 98 Close Down Working Group

III. Open Issues

Items with final dates which are TBD, but by end of 1998...

IV. Presentations

ITU-T Study Group 11 liaison, Muneyoshi Suzuki

Acting as a liaison from ITU-T, M. Suzuki presented his draft, "The Assignment of the Information Field and Protocol Identifier in the Q.2941 Generic Identifier and Q.2957 User-to-user Signaling for the Internet Protocol".

Study Group 11 has been extending the BISDN signaling capabilities in ways which they hope will be of benefit to IP protocols. The purpose of this presentation was to apprise the working group of their efforts and to share their specification.

Their document specifies the assignment of the information field and protocol identifier in the Q.2941 Generic Identifier and Q.2957 User-to-user Signaling for the Internet protocol.

SG11 has set a goal of Q3 98 to identify internet services which don't need further signaling enhancements, and Q1 99 for those that do.

A large portion of the code space has been set aside for administration by IANA.

All members of the WG are encouraged to read the draft and consider how it may be employed. The Chairs thanked Mr. Suzuki and the SG 11 for providing this mechanism and sharing it with the ION WG.

Updates to the OSPF Address Resolution Advertisement and Intra-area IP Unicast drafts, Juha Heinanen <draft-ietf-ospf-ara-01.txt> <draft-ietf-ion-intra-area-unicast-01.txt>

Rob Coltun updated the group on the above drafts. Most of the technical updates pertain to OSPF, so this presentation was largely informational. Rob has added some sub-community capabilities to the opaque LSA.

George Swallow and Rob discussed using cached OSPF metric information to determine when it is safe to continue to use an SVC indicated by an old route while an SVC to support a new (better) route is being established.

Updates to the ION security drafts, Grenville Armitage
<draft-armitage-ion-sec-arp-00.txt> <draft-armitage-ion-security-01.txt>

These were introduced in order to call them to the working groups attention. They will be updated prior to the March meeting. Working group members are encouraged to read and comment.

Updates to the IPv6 over NBMA and ATM drafts, Grenville Armitage
<draft-ietf-ion-ipv6-00.txt> <draft-ietf-ion-ipv6-atm-00.txt>

The primary technical change to this document is that the IPv6 Flow label is used to adjudicate shortcut attempts. Only flows with a flow label of zero are candidates for short cuts. This will be presented to the IPNG WG. The results will be discussed on the mail list.

IPv6 over Frame Relay and IPv6 Inverse Neighbor Discovery drafts, Alex Conta
<draft-conta-ion-ipv6-fr-00.txt> <draft-conta-ion-ipv6-ind-00.txt>

These drafts define the operation of IPv6 over Frame Relay. They define an IPv6 Inverse Neighbor Discovery (IND) protocol which is analogous to the inverse arp used for IPv4. The protocol allows a Frame Relay node to discover dynamically the DLCI associated with one of its virtual circuits at the remote node and an IPv6 address of that remote node.

The Frame Relay interface token is constructed from the EUI bits (set to 00 to indicate local and unicast), a 38 bit MID for uniqueness, and 24 bits which contain the DLCI, zero filled. All 1s in the DLCI field indicates unspecified.

The drafts will be re-issued as WG drafts with the expectation that they can be forwarded to the IESG in advance of our next meeting.

Proxy PAR for ATM router autoconfiguration, Tony Przygienda

Proxy PAR (PNNI Augmented Routing) is an extension to PNNI being developed at the ATM Forum. It is designed to provide an autoconfiguration capability. This is accomplished by allowing routers to inject some information into PNNI. PNNI distributes this information through it's linkstate machinery. It is then passed up to other routers. This allows the discovery of other routers and their capabilities.

The current draft offers an overview of Proxy PAR and was presented to motivate defining the use of PAR within the ION WG. This was accepted as a work group item. No completion date has been specified, except that it is expected prior to 12/98.


ION Introduction
ION: ipv6 FR
ION: ipv6 IND
Proxy PAR (draft-droz-proxypar-arch-00.txt)
Muneyoshi Suzuki's Presentation

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