RFC 1793: Extending OSPF to Support Demand Circuits
The author of this RFC did an excellent job in summarizing its contents. A direct quote of selected sections taken from the RFC provides you with an excellent overview of this RFC and its contents. The following section comes directly from RFC 1371:
This memo defines enhancements to the OSPF protocol that allow efficient operation over “demand circuits”. Demand circuits are network segments whose costs vary with usage; charges can be based both on connect time and on bytes/packets transmitted. Examples of demand circuits include ISDN circuits, X.25 SVCs, and dial-up lines.
The periodic nature of OSPF routing traffic has until now required a demand circuit’s underlying data-link connection to ...
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