Re: M2PA: BSN processing when FSN out of order
"Brian F. G. Bidulock" <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Organization | http://www.openss7.org/ |
| Message-ID | <[email protected]> |
Mark, Davidson, Mark wrote: (Thu, 22 Jun 2006 09:03:02) > > Why does the above requirement exist if M2PA does not retransmit? > See "M2PA Last Call Comment - FSN" from July 14, 2003 (copied below): | From [email protected] Mon Jul 14 04:05:05 2003 | From: "Brian F. G. Bidulock" <[email protected]> | Organization: http://www.openss7.org/ | To: "'[email protected]'" <[email protected]> | Date: Mon, 14 Jul 2003 04:04:30 -0600 | Subject: [Sigtran] M2PA Last Call Comment - FSN | | M2PA-09 says: | | If M2PA receives a User Data message with an FSN that is out of order, | M2PA SHALL place the link out of service (see section 4.1.6 Link Out | of Service). | | This conflicts with Q.703 that ignores an MSU that contains an FSN that | is other than the next expected FSN (i.e, out of order). This makes it | difficult to implement (and is probably the last thing standing in the | way of implementing) something like the following (that was requested by | ITU): | | _________________ | | | | | IWF | | |_________________| | | | | | | MTP2 | M2PA | | |________|________| | | | | ____| |___ | | If M2PA discards the message as Q.703 does, and the other end of the | link was actually broken, the link will be go out of service in due | course anyway. | | Change to: | | If M2PA receives a User Data message with an FSN that is out of order, | M2PA SHALL discard the message. | | --brian | | -- | Brian F. G. Bidulock | [email protected] | http://www.openss7.org/ | | _______________________________________________ | Sigtran mailing list | [email protected] | https://www1.ietf.org/mailman/listinfo/sigtran -- Brian F. G. Bidulock [email protected] http://www.openss7.org/