M3UA:Unexpected ASPSM/ASTM Message (Jacky Chen)

thanks,brain:

your ansers:

1.a) No, because the ASP is ASP-DOWN for all the other AS.  See the state
diagram in RFC 4666 Figure 3 and the description above the diagram
and the description in 4.3.4.1.  Note that the only transition from
ASP-INACTIVE to ASP-DOWN is using the ASP Down message which results
in the ASP moving to the ASP-DOWN state for _all_ AS.  So, if a given
AS is in the ASP-DOWN state and the ASP receives an ASP Inactive Ack,
_all_ the AS are in the ASP-DOWN state.  Sending an ASP Down message
in this case has precisely the desired effect.

1.b)my new question:
   (1)if ASP is in ASP-ACTIVE Status ,When received unexpected ASP_INACTIVE
ACK Message,

how to do ? send ASP_ACTIVE Message containing the RC(ASP_INACTIVE ACK'S) ?

    (2)  if ASP is in ASP-INACTIVE status ,When received unexpected
ASP_INACTIVE ACK Message,it need send to ASP-INACTIVE Message or do
nothing?
    (3)if ASP is now in ASP-INACTIVE status,When received unexpected
ASP_ACTIVE ACK Message,it enter into ASP-ACTIVE Status or how to do?

  when  these happen,the rfc4666's"then initiate procedures to return
itself to its previous state" can explain these all?
 not need to explain one by one ???


2.a)  Completely reasonable: the SGP is required to send ASP Up Ack in
     response to ASP Up, in which case the ASP Up Ack is always expected
by the ASP, cf. RFC 4666 4.3.4.1.  The only reason for an unexpected
 ASP Up Ack is some sort of error, in which case the procedure will
 attempt to properly resynchronize state.

2.b)my new question:

   when ASP Send ASP-UP Message,But ASP-UP-ACK Message not be sent back
immediately.Then LM maybe ask ASP to Send ASP_DOWN Message
And ASP_DOWN Ack Message is received earler than ASP_UP ACK Message.
  then ASP Will Be Setted into ASP-INACTIVE Status????

3)i think the SGP maybe send ASP-*-ACK Message because of some exception or
data configure change  or SGP Want to synchronizing itselt status with ASP
Using ASP-*-ACK Message ???
      your opinion maybe is more different as mine.

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