Internetworking Over NBMA (ion)

Status: Concluded June, 2000 
 Andy Malis 
Description of Working Group:
Note: This Working Group is jointly chartered by the Routing Area.
The Routing Area Director:  Joel Halpern (
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
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.

Request for Comments:

  • RFC2115 Management Information Base for Frame Relay DTEs Using SMIv2 (Draft Standard)
  • RFC2121 Issues affecting MARS Cluster Size (Informational)
  • RFC2149 Multicast Server Architectures for MARS-based ATM multicasting. (Informational)
  • RFC2225 Classical IP and ARP over ATM (Proposed Standard)
  • RFC2226 IP Broadcast over ATM Networks (Proposed Standard)
  • RFC2269 Using the MARS model in non-ATM NBMA networks. (Informational)
  • RFC2320 Definitions of Managed Objects for Classical IP and ARP Over ATM Using SMIv2 (IPOA-MIB) (Proposed Standard)
  • RFC2331 ATM Signalling Support for IP over ATM - UNI Signalling 4.0 Update (Proposed Standard)
  • RFC2332 NBMA Next Hop Resolution Protocol (NHRP) (Proposed Standard)
  • RFC2333 NHRP Protocol Applicability Statement (Proposed Standard)
  • RFC2334 Server Cache Synchronization Protocol (SCSP) (Proposed Standard)
  • RFC2335 A Distributed NHRP Service Using SCSP (Proposed Standard)
  • RFC2336 Classical IP to NHRP Transition (Informational)
  • RFC2337 Intra-LIS IP multicast among routers over ATM using Sparse Mode PIM (Experimental)
  • RFC2366 Definitions of Managed Objects for Multicast over UNI 3.0/3.1 based ATM Networks (Proposed Standard)
  • RFC2390 Inverse Address Resolution Protocol (Draft Standard)
  • RFC2417 Definitions of Managed Objects for Multicast over UNI 3.0/3.1 based ATM Networks (Proposed Standard)
  • RFC2427 Multiprotocol Interconnect over Frame Relay (Standard)
  • RFC2443 A Distributed MARS Service Using SCSP (Experimental)
  • RFC2491 IPv6 over Non-Broadcast Multiple Access (NBMA) networks (Proposed Standard)
  • RFC2492 IPv6 over ATM Networks (Proposed Standard)
  • RFC2520 NHRP with Mobile NHCs (Experimental)
  • RFC2583 Guidelines for Next Hop Client (NHC) Developers (Informational)
  • RFC2590 Transmission of IPv6 Packets over Frame Relay Networks Specification (Proposed Standard)
  • RFC2601 ILMI-Based Server Discovery for ATMARP (Proposed Standard)
  • RFC2602 ILMI-Based Server Discovery for MARS (Proposed Standard)
  • RFC2603 ILMI-Based Server Discovery for NHRP (Proposed Standard)
  • RFC2677 Definitions of Managed Objects for the NBMA Next Hop Resolution Protocol (NHRP) (Proposed Standard)
  • RFC2684 Multiprotocol Encapsulation over ATM Adaptation Layer 5 (Proposed Standard)
  • RFC2685 Virtual Private Networks Identifier (Proposed Standard)
  • RFC2735 NHRP Support for Virtual Private Networks (Proposed Standard)
  • RFC2843 Proxy PAR (Informational)