Re: Doubt regarding SCTP TSN/SSN

On Sep 1, 2009, at 2:13 PM, Nagesh wrote:

> Hi Group,
>       I have a following doubt regarding SCTP TSN/SSN Handling.
Hi,

please note that SCTP is now handled at [email protected].
>
>      
> SCTP 
>                                                                                                                 SCTP
> (Peer  
> Node 
> )                                                                                                       (Local 
>  Node)
>                      Association is established with Local Init TSN  
> = 0
>                    
> ß 
> ---------------------------------------------------------------------------------------------à
>                                           DATA1
>                    
> -------------------------------------------------------------------------------------------------à
>                         TSN(0)     SSN(0)   StreamId = 0
>
>                                           DATA2
>                    
> -------------------------------------------------------------------------------------------------à
>                         TSN(2)     SSN(1)   StreamId = 0
>
>                                           DATA3
>                    
> -------------------------------------------------------------------------------------------------à
>                         TSN(1)     SSN(2)   StreamId = 0
This assignment is broken, since the TSN of SSN(1) should be smaller  
than the
one of SSN(2).
>
>                                           DATA4
>                    
> -------------------------------------------------------------------------------------------------à
>                         TSN(2)     SSN(3)   StreamId = 0
So you are resusing TSN(2) here? It will be dropped, since it was  
already received.
>
>                                           DATA5
>                    
> -------------------------------------------------------------------------------------------------à
>                         TSN(3)     SSN(3)   StreamId = 0
>
>             What should be the behavior when we receive DATA4 and  
> DATA5 since the SSN is in sequence but the TSN is out-of-order?
>
>      Request you to please clarify my doubt.
>
> Thanks and Regards,
> Nagesh.
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