By ISO IEC JTC 1 SC 6
Specifies a protocol utilized by community Layer entities in finish structures (ES) and Intermediate platforms (IS) to keep up routing details. Defines: transmission methods for configuration and routing info among ES and IS; the encoding of protocol information devices; approaches for protocol keep an eye on info interpretation; practical standards for implementations conforming with this regular. References: ISO 7498; 7498 upload. 1 and four; 8208; 8348 upload. 1 and a pair of; ISO 8473; 8648; 8802; CCITT X.25.
Read or Download ISO 9542:1988, Information processing systems - Telecommunications and information exchange between systems - End system to Intermediate system routeing ... for providing the connectionless-mode network service PDF
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Additional resources for ISO 9542:1988, Information processing systems - Telecommunications and information exchange between systems - End system to Intermediate system routeing ... for providing the connectionless-mode network service
Example text
When the Record Configuration function is invoked in either an End System or an Intermediate System, the 26 function will determine if the received configuration information was previously unknown. If this is the case, then the Report Configuration function may be invoked before the expiration of the system’s Configuration Timer. The Hello PDU generated by the Report Configuration function is then sent only to the Network Entity whose configuration was previously unknown. Thus when an ES or IS first becomes operational it immediately reports its configuration.
It is provided to assist implementers of the protocol. In the event of a discrepancy between the description in these tables and that contained in the text, the text takes precedence. This Annex describes the protocol in terms of state tables, tables 7 and 8, which show the state of an End System and an Intermediate System, the events that occur in the protocol, the actions taken, and the resultant state. Tables 4, 5 and 7, and the following descriptive text, define the notation used in the state tables themselves.
Under certain circumstances, it is possible to do better and recognize the existence of a black hole sooner. In particular, if the ES expects to hear ISH PDUs from the IS to which it has been redirected, and the Holding Timer for that IS expires, all knowledge of the IS may be forgotten by the ES. This includes any redirects, which may be flushed (see the Flush Old Redirect function) even though their timeouts have not expired. 5 An Example of using the Address and SNPA Masks Consider an NSAP address authority which decomposes the DSP into k hierarchical elements as shown in figure 13.