RFC 1581 (rfc1581) - Page 1 of 4
Protocol Analysis for Extensions to RIP to Support Demand Circuits
Alternative Format: Original Text Document
Network Working Group G. Meyer
Request for Comments: 1581 Spider Systems
Category: Informational February 1994
Protocol Analysis for Extensions to RIP to Support Demand Circuits
Status of this Memo
This document provides information for the Internet community. This
document does not specify an Internet standard of any kind.
Distribution of this document is unlimited.
Abstract
As required by Routing Protocol Criteria [1], this report documents
the key features of Routing over Demand Circuits on Wide Area
Networks - RIP [2] and the current implementation experience.
Acknowledgements
I would like to thank colleagues at Spider, in particular Richard
Edmonstone and Alan Turland who developed Spider's IP RIP and IPX RIP
and SAP implementations.
1. Protocol Documents
"Extensions to RIP to Support Demand Circuits" [2] suggests an
enhancement to the "Routing Internet Protocol" (RIP) [3] and "RIP-2"
[4] to allow them to run more cost-effectively on Wide Area Networks
(WANs). Network management extensions for Demand RIP are described
in RIP Version 2 MIB Extensions [5].
2. Applicability
Demand RIP requires that there is an underlying mechanism for
determining unreachability in a finite predictable period.
The demand extensions to RIP are particularly appropriate for WANs
where the cost - either financial or packet overhead - would make
periodic transmission of routing (or service advertising) updates
unacceptable:
o Connection oriented Public Data Networks - for example X.25 packet
switched networks or ISDN.
o Point-to-point links supporting PPP link quality monitoring or
echo request to determine link failure.
Meyer
