DPC + OPC Routing

anjali gurmukhani <[email protected]>
Newsgroups gmane.ietf.sigtran
Message-ID <[email protected]>
 
  Hello Brian and all...
  
 
  I had one question related to a scenario incase of  DPC + OPC routing is used in M3UA. Please see the figure below.
   
  Consider that at SG(STPB), there are two Application servers configured handling the traffic for the same DPC but originating from different OPCs
   
  AS1 - Rk Type - DPC + OPC - DPC = 0-0-9, OPC = 2-8-221 - ASP1
AS2 - Rk Type - DPC + OPC - DPC = 0-0-9, OPC = 2-8-222 - ASP2

  
    MSC1(2-8-221)
          /-----\          STPA        STPB        DPC=0-0-9
        ||       ||       +---- -+        +----- +
         |       |--------|       +------- |       +--------ASP1(catering traffic for AS1)
          \-----/        +--+--+        +---+-+
                             |               |
                             |               |
                             |               |
     MSC2(2-8-222)  |               |
          ||------+---------+             +-----------ASP2(catering traffic for AS2)
           |     |
            \---/

   
  Both AS's have a single ASP catering to them. 
   
  If the ASP serving AS1 goes down, how would (through which message) STPB (SG)propagate this to its adjoining STP(STPA) and hence to OPC(because as such DPC 0-0-9 is still available) , so that MSC1 does not send any messages for ASP1?
   
   
  -Regards
  Anjali.

 
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