Re: About the Notify message in SUA

Hi Prasanna,

 

 

Following is the second last sentence of the paragraph you have pointed:
-

"The Notify message must be sent whether the AS

state change was a result of an ASP failure or reception of an ASP

State management (ASPSM) / ASP Traffic Management (ASPTM) message."

 

 

Here, at the second part of this sentence RFC talks about transmission
of NOTIFY on the reception of ASPSM/ASPTM message. 

 

And following is the last sentence of the paragraph.

 

"In

the second case, the Notify message MUST be sent after any ASP State

or Traffic Management related acknowledgement messages  (e.g., ASP Up

Ack, ASP Down Ack, ASP Active Ack, or ASP Inactive Ack)."

 

 

Here RFC talks about the ordering of the ASPTM/ASPSM-ACK messages and
NOTIFY messages being transmitted from the receiver of the ASPTM/ASPSM
messages. And mentions that the NOIIFY message MUST be sent (from the
receiver of ASPSM/ASPTM message) after sending the respective
ASPSM/ASPTM ACK messages. 

 

To conclude, the transmitter of the ACK message will send the NOTIFY
message, but only after transmitting the respective ACK message. 

This is mandated so that the state machines for peer (ASP) at the
receiver (of ACK and NOTIFY messages) would already be updated by the
time NOTIFY message will be received (as then only the NOTIFY message
for AS state change would make sense).

 

 

Also, ASP management procedures are same across M3UA and SUA. And the
same paragraph can be found in the M3UA RFC 4666, at the same section
number.

 

 

Thanks and Regards,

Rabindra Nath Tiwari

 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Prasanna Kumar
Sent: Thursday, November 12, 2009 3:11 PM
To: [email protected]
Subject: [Sigtran] About the Notify message in SUA

 

Hi,

 

The SUA RFC 3868 say about the notify message as follows.

 

4.3.4.5.  Notify Procedures

   A Notify message reflecting a change in the AS state MUST be sent

to all ASPs in the AS, except those in the ASP-DOWN state, with

appropriate Status Information and any ASP Identifier of the failed

ASP.  At the ASP, Layer Management is informed with an M-NOTIFY

indication primitive.  The Notify message must be sent whether the AS

state change was a result of an ASP failure or reception of an ASP

State management (ASPSM) / ASP Traffic Management (ASPTM) message. "In

the second case, the Notify message MUST be sent after any ASP State

or Traffic Management related acknowledgement messages  (e.g., ASP Up

Ack, ASP Down Ack, ASP Active Ack, or ASP Inactive Ack)."

 

Here it refers the second case in last line, which says that the

"Notify message must be sent after the ACK message for the

ASPTM/ASPSM". Here does it mean that the receiver of the ACK (ACK

message for ASPTM/ASPSM) message has to send the Notify message?

 

Please clarify and thanks in advance.

 

Regards,

Prasanna.

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