Classical IP and ARP over ATM to NHRP Transition (RFC2336)
Original Publication Date: 1998-Jul-01
Included in the Prior Art Database: 2019-Feb-15
Internet Society Requests For Comment (RFCs)
This document describes methods and procedures for the graceful transition from an ATMARP LIS to an NHRP LIS network model over ATM. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.
Network Working Group J. Luciani Request for Comments: 2336 Bay Networks Category: Informational July 1998
Classical IP and ARP over ATM to NHRP Transition
Status of this Memo
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (1998). All Rights Reserved.
This document describes methods and procedures for the graceful transition from an ATMARP LIS to an NHRP LIS network model over ATM.
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this document, are to be interpreted as described in .
ATMARP defines an initial application of classical IP and ARP in an ATM network environment configured as a LIS. ATMARP only considers application of ATM as a direct replacement for the "wires" and local LAN segments connecting IP end-stations and routers operating in the "classical" LAN-based paradigm.
The NBMA Next Hop Resolution Protocol (NHRP) allows a source station (a host or router), wishing to communicate over a Non-Broadcast, Multi-Access (NBMA) subnetwork, to determine the internetworking layer addresses and NBMA addresses of suitable "NBMA next hops" toward a destination station. If the destination is connected to the NBMA subnetwork and direct communication is administratively allowed, then the NBMA next hop is the destination station itself. Otherwise, the NBMA next hop is the egress router from the NBMA subnetwork that is "nearest" to the destination station. For the purposes of this document, the NBMA network is of type ATM.
Luciani Informational [Page 1]
RFC 2336 Classical IP and ARP over ATM to NHRP July 1998
It is reasonable to expect that ATMARP Clients and NHRP Clients will initially coexist within a LIS. Thus, it is necessary to define a graceful transition, including a period of coexistance, from the use of ATMARP to the use of NHRP for address resolution in the LIS . In short, NHSs will be required to respond to ATMARP Client queries in a fashion which will permit continued use of the ATMARP Client within the LIS during the ATMARP to NHRP transition period. Note that this document places no protocol requirements upon ATMARP servers.
For the following, it will be assumed that the reader is familiar with the terminology as described in .
2. Service Requirements
If NHRP is to be used in a LIS then only NHSs will be used in the LIS; that is, there will not be a mixture of NHSs and ATMARP servers within the same LIS. Since ATMARP servers will not be able to understand NHCs and since, as described below, NHSs will respond to ATMARP Clients, this is a reasonable simplifying restriction.
This document will only address SVC based environments and will not address PVC environments. This document will refer only to ATM AAL5 as the NBMA and IP as the protocol layer...