Subject: [SUA Issue] Hop Counter

From: [email-masked]
Date: Tue, 28 Aug 2001 15:18:25 +0300

Hi all,

Currently, Hop Counter has no home.  It has been removed from the 
Flags/QoS Parameter.

I will entertain discussion on this for the next few days.

The issue is: 

Is a Hop Counter needed.  If so, what messages (mandatory/option) is
it present in & when is it decremented.

John

> -----Original Message-----
> From: ext Brian F. G. Bidulock [mailto:[email-masked]]
> Sent: 24 August, 2001 07:52
> To: [email-masked]
> Subject: Re: SUAv7: Usage of Flag Parameters
> 
> 
> Sandeep,
> 
> [email-masked] wrote: (Fri, 24 Aug 2001 09:53:24)
> > 
> > 
> > Hi ,
> > 
> > I suggest following two text changes.
> > 
> > 1. Hop counter should be decremented at each relay node , 
> GTT may and may not be
> > performed at all relay nodes. To reflect this text in 
> section 3.9.1 be changed
> > to say
> 
> Relay nodes perform GTT by definition.
> 
> > 
> > 3.9.1 Flags
> > Hop counter is decremented each time the relay function is 
> invoked within an
> > intermediate (relay) node. The value of the hop counter is 
> in the range 15 to 1.
> 
> This is already stated in Section 1.5.3
> 
> > 2. Hop counter parameter can not be passed across IP and 
> SS7 networks, hence
> > SCCP hop counter parameter looses meaning once a SCCP/SUA 
> user message crosses
> > network boundary.  So in the following text originating 
> node can only be IP
> > node.
> > 
> > Section 1.5.3
> > To prevent looping, a hop counter is used. The originating 
> end node (be it an
> > SS7 or an IP node) sets the value of the hop counter to the 
> maximum value (15 or
> > less)
> 
> This is already stated in Section 1.5.3.  An SS7 node (SG) 
> can set the value
> if the implementation wants to.
> 
> --brian
> 
> -- 
> Brian F. G. Bidulock
> [email-masked]
> http://www.openss7.org/
> 
> 
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