[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

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