Re: Interface Identifier in ASPTM message in M2UA

Hello Sandeep Singh and all,

   I differ from your inference of the section 3.3.2.7 (Page 36 RFC
3331). It would be in conflict to section 3.2 (Page 22 of RFC 3331)
which actually defines the structure of the Interface Identifier.
Section 3.3.2.7 gives an indication of the possible parameters in the
ASPAC message but does not define the structure of the parameters (Of
course there is an ambiguity in the RFC or rather error, wherein in
section 3.2 indicates M2UA specific headers are used only with MAUP
messages while they are used also with other messages like ASPSM
messages).

 

So from the structure of the Integer Interface Identifier we need to
follow section 3.2 which clearly states the length value cannot be
greater than 8.

 

Regards,

Rajangam 

 

________________________________

From: [email protected] [mailto:[email protected]] On
Behalf Of Sandeep Singh
Sent: Friday, September 02, 2011 5:55 PM
To: [email protected]; Rajesh Makhija; [email protected];
[email protected]; [email protected]
Subject: Re: [Sigtran] Interface Identifier in ASPTM message in M2UA

 

Hi everybody,   

Thanks for your valuable inputs. 

It is very clear from Page 36 of RFC 3331 that the length of Interface
Identifier Set having Tag (0x1) can have Length more than 8. 

According to the following figure, the length should be (n*4 + 4) if
there are n Interface Identifiers:

    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5  6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Tag (0xb)                    |            Length = 8
|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                               Traffic Mode Type
|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Tag (0x1=integer)               |            Length
|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   /
\
   \                                   Interface Identifiers*
/
   /
\
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Please let me know if there is anything wrong in my understanding. 


Best Regards,

Sandeep Singh 


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