Re: RFC 4666 on Signaling System 7(SS7)Message TransferPart 3 (MTP3) - User Adaptation Layer (M3UA)
"Brian F. G. Bidulock" <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Organization | http://www.openss7.org/ |
| Message-ID | <[email protected]> |
Lincoln, My ISP powers their DSLAMs off of commercial power. (And they are also the incumbent phone company.) There are in fact many maintenance reasons for withdrawing traffic from a node (e.g. SGP). Maintenance. Software upgrade. Network reconfiguration. SS7 handles these through the management and inhibition of signalling links using the same set of procedures that are used for failure. The management reasons do not include failure. In the draft, I highlight the race condition between two SGP when traffic is switched between them. Without these procedures it is unlikely that one could switch traffic on, say, an high capacity HLR, without risking either message missequencing from prematurely divering traffic to the alternate SGP, or risking widespread transaction failure by delaying the traffic too long. A protocol approach can switch traffic almost instantaneously, and with little risk. Just taking one ASP in the pool down for software upgraed on a big HLR could cause havoc in the network. As things stand, you better do it at 3:00 am. --brian -- Brian F. G. Bidulock [email protected] http://www.openss7.org/