RE: DRN Label Issues -- Issue #1

Brian,

I would assume that anyone who is implementing the DRN routing mechanism
will use a mechanism that assures a one to one routing between DRN and
DLR.  Otherwise the mechanism would be useless.  This seemed obvious to
me.  But if you feel that we need to clarify this in the IG, I'd be
happy to specify this.

Regards,
Lincoln 

-----Original Message-----
From: Brian F. G. Bidulock [mailto:[email protected]] 
Sent: Wednesday, October 11, 2006 3:27 PM
To: Haresign Lincoln
Cc: Barry Nagelberg; [email protected]
Subject: DRN Label Issues -- Issue #1

Lincoln,

Here is the DLR/DRN problem restated:

RFC 3868 says:

4.7.3.2.  SCCP Connection Oriented traffic

   Messages not containing a destination reference number (DRN), i.e., a
   Connection Request, MAY be loadshared among the available ASPs.  The
   load distribution mechanism is an implementation issue.  When a DRN
   is present, the SG extracts the label and selects the ASP that
   corresponds with it.  If an ASP is not available, the SG discards the
   message.

But messages arriving from the SS7 network do no have DRNs.  They have
DLRs.  There is no 1:1 mapping requirement between a DLR and a DRN.
Therefore, because no CO SCCP SS7 message has a DRN in it, I assume that
all messages can be loadshared and that DRN Label is completely
ineffective.

--brian

--
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/