OSPF over ATM and Proxy-PAR (RFC2844)
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2019-Feb-13
Internet Society Requests For Comment (RFCs)
T. Przygienda: AUTHOR [+2]
This memo specifies, for OSPF implementors and users, mechanisms describing how the protocol operates in ATM networks over PVC (Permanent Virtual Connections) and SVC (Switched Virtual Circuit) meshes with the presence of Proxy-PAR (PNNI Augmented Routing). This memo defines an Experimental Protocol for the Internet community.
Network Working Group T. Przygienda Request for Comments: 2844 Siara Category: Experimental P. Droz R. Haas IBM May 2000
OSPF over ATM and Proxy-PAR
Status of this Memo
This memo defines an Experimental Protocol for the Internet community. It does not specify an Internet standard of any kind. Discussion and suggestions for improvement are requested. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (2000). All Rights Reserved.
This memo specifies, for OSPF implementors and users, mechanisms describing how the protocol operates in ATM networks over PVC and SVC meshes with the presence of Proxy-PAR. These recommendations require no protocol changes and allow simpler, more efficient and cost- effective network designs. It is recommended that OSPF implementations should be able to support logical interfaces, each consisting of one or more virtual circuits and used either as numbered logical point-to-point links (one VC), logical NBMA networks (more than one VC) or Point-to-MultiPoint networks (more than one VC), where a solution simulating broadcast interfaces is not appropriate. PAR can help distribute across the ATM cloud configuration setup and changes of such interfaces when OSPF capable routers are (re-)configured. Proxy-PAR can in turn be used to exchange this information between the ATM cloud and the routers connected to it.
Proxy-PAR and PAR have been accepted as standards by the ATM Forum in January 1999 . A more complete overview of Proxy-PAR than in the section below is given in .
Przygienda, et al. Experimental [Page 1]
RFC 2844 OSPF over ATM and Proxy-PAR May 2000
1.1 Introduction to Proxy-PAR
Proxy-PAR  is an extension that allows different ATM attached devices (like routers) to interact with PAR-capable switches and to query information about non-ATM services without executing PAR themselves. The Proxy-PAR client side in the ATM attached device is much simpler in terms of implementation complexity and memory requirements than a complete PAR protocol stack (which includes the full PNNI  protocol stack) and should allow easy implementation, e.g. in existing IP routers. In addition, clients can use Proxy-PAR to register the various non-ATM services and protocols they support. Proxy PAR has consciously been omitted as part of ILMI  due to the complexity of PAR information passed in the protocol and the fact that it is intended for integration of non-ATM protocols and services only. A device that executes Proxy-PAR does not necessarily need to execute ILMI or UNI signaling, although this normally will be the case.
The protocol in itself does not specify how the distributed service registration and data delivered to the client is supposed to drive other protocols. Hence OSPF routers, for instance, that find themselves through Proxy-PAR could use this information in a Classical IP and ARP over ATM  fashion, forming a full mesh of point-to-point connections...