RE: SE-IPSP definition

Brian,

[..snip..]
> - To have a single exchange of messages it is a necessary that one side
>   behave like an ASP (messages and state machines) and the other behave
>   like an SGP (messages and state machines).
[TOLGA]Wrong. Take a look to Figure 3. IPSP can send and receive ASPAC/ASPIA
messages. As an example -just showing ASPAC messages-

 SE-IPSP1                    SE-IPSP2
     |                          |
     |-------ASPAC------------->|
     |                          |
     |<-----ASPAC-ACK-----------|
     |                          |
     |    AS is active at both  |
     |        sides             |
     |                          |
     |<-------ASPIA-------------|
     |                          |
     |------ASPIA-ACK---------->|
     |                          |
     |    AS is inactive        |
     |    at both sides         |
     |                          |

The above is a valid message sequence. Neither ASP nor SGP can support the
above message exchange. Thinking that an SE-IPSP behaves as ASP and the
other one as SGP for the whole set of message exchanges is wrong. I singled
out this issue because this is the key of the confusion. Basically, an IPSP
is an IPSPS neither ASP not a SGP.