Re: M3UA notify following ASP-up-ack

David,

yes, it should, provided this ASP Up Ack message follows the ASP transition 
from ASP-Down to ASP-Inactive, see Section 4.3.4.5 of RFC 4666:

"When an ASP moves from ASP-DOWN to ASP-INACTIVE within a particular AS, a 
Notify message SHOULD be sent, by the ASP-UP receptor, after sending the 
ASP-UP-ACK, in order to inform the ASP of the current AS state."


Regards,
Sergey Mikhailov.




----- Original Message ----- 
From: "David Laight" <[email protected]>
To: "sigtran" <[email protected]>
Sent: Tuesday, February 17, 2009 8:55 PM
Subject: [Sigtran] M3UA notify following ASP-up-ack


> Should an M3UA SGP always send out a Nofity with the current
> state of the AS following an ASP-Up-Ack?
>
> This message is shown in the all the n+k sparing/loadsharing
> examples in section 5 of RFC 4666.
> Section 3.8.2 only states that the notifications are sent
> when the AS state itself changes.
>
> Without such a notification it is almost impossible for
> a loadshare ASP to know whether it is allowed to send
> traffic following its own ASP activate sequence, since
> it cannot know whether the AS was already active, or still
> has insufficient ASP.
>
> The only alternative is for the ASP to (effectively) assume
> that the AS is 'active' unless/until told otherwise.
>
> David
>
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