Re: [M3UA] IPSP DE ASP Up Procedures
Igor Fedotov <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Message-ID | <[email protected]> |
Hi, Evgenij IMHO M3UA spec isn't clear in the issue. This was mentioned for example at SIGTRAN PLUGTESTS in Moscow in 2007 ( http://www.etsi.eu/WebSite/document/PlugtestsHistory/2007SIGTRAN/SIGTRAN_2007_REPORT.pdf, day 5 report, issue 1). I'd say, the most preferable approach would be to use four messages in Double Exchange, as described here: http://www.archivum.info/[email protected]/2005-07/00030/RE:_%5BSigtran%5D_M3UA_:_2_or_4_messages_for_ASP-UP_in_IPSP_DE > *From: *Evgenij <[email protected] <mailto:[email protected]>> > *Date: *December 16, 2009 7:35:12 AM PST > *To: *[email protected] <mailto:[email protected]> > *Subject: **[Sigtran] [M3UA] IPSP DE ASP Up Procedures* > > Hi All, > > How many interchange ASP Up messages are needed for ASP Up procedure? > In section 4.3.4.1.2 saying that four messages are needed but in > section 5.6.2 saying that one single exchange of ASP UP message is > enough. It is contradiction or not? > > 4.3.4.1.2. IPSP Considerations (ASP Up) > > Alternatively, when using the IPSP DE model, an interchange of ASP Up > messages from each end *MUST* be performed. Four messages are needed > for completion. > > 5.6.2. Double Exchange > > IPSP-A IPSP-B > | | > |<-------------ASP Up------------| > |-----------ASP Up Ack---------->| > | | > |-------------ASP Up------------>| (optional) > |<----------ASP Up Ack-----------| (optional) > | | > |<------- ASP Active(RCb)--------| RC: Routing Context > |-----ASP Active Ack (RCb)------>| (optional) > | | > |------- ASP Active(RCa)-------->| RC: Routing Context > |<-----ASP Active Ack (RCa)------| (optional) > | | > |<========= DATA (RCa) =========| > |========== DATA (RCb) ========>| > | | > |<-----ASP Inactive (RCb)--------| RC: Routing Context > |----ASP Inactive Ack (RCb)----->| > | | > |------ASP Inactive (RCa)------->| RC: Routing Context > |<----ASP Inactive Ack (RCa)-----| > | | > |<-----------ASP Down------------| > |---------ASP Down Ack---------->| > | | > |------------ASP Down----------->| (optional) > |<--------ASP Down Ack-----------| (optional) > | | > > In this approach, *only one single exchange of ASP Up message* can be > considered sufficient since the response by the other peer can be > considered a notice that it is in ASP_UP state. > > --- > > Regards > > Evgenij > > _______________________________________________ > Sigtran mailing list > [email protected] <mailto:[email protected]> > https://www.ietf.org/mailman/listinfo/sigtran _______________________________________________ Sigtran mailing list [email protected] https://www.ietf.org/mailman/listinfo/sigtran