Subject: [Dime] Redirecting a Diameter Message ??

From: lijijun 41867 <[email-masked]>
Date: Mon, 30 Oct 2006 11:44:23 +0800

Hi,all

RFC3588 2.8.3.  Redirect Agents
   Since redirect agents do not relay messages, and only return an
   answer with the information necessary for Diameter agents to
   communicate directly, they do not modify messages.  Since redirect
   agents do not receive answer messages, they cannot maintain session
   state.  Further, since redirect agents never relay requests, they are
   not required to maintain transaction state.
   
                               +------+
                               |      |
                               | DRD  |
                               |      |
                               +------+
                                ^    |
                    2. Request  |    | 3. Redirection
                                |    |    Notification
                                |    v
    +------+    --------->     +------+     --------->    +------+
    |      |    1. Request     |      |     4. Request    |      |
    | NAS  |                   | DRL  |                   | HMS  |
    |      |    6. Answer      |      |     5. Answer     |      |
    +------+    <---------     +------+     <---------    +------+
   example.net                example.net               example.com

                 Figure 3: Redirecting a Diameter Message

I have a question about : since redirect agents never relay requests, they are not required to maintain transaction state.
   
   If this means that the connection of DRD and DRL will be closed after once communication ?     
   Transaction state is the same word with the connection ?   
   I think the connection(TCP/SCTP) of DRD and DRL should be linked for next communication.
   
another question: If it is likelihood that DRD send a message to DRL first, then DRL answer to DRD? 
	
 any comments are highly appreciated.

    Thanks,
     lijijun  

   

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