Subject: RE: [SUA Issue] Hop Counter

From: Verwimp Gery <[email-masked]>
Date: Tue, 28 Aug 2001 15:31:42 +0200

John,

Hop counter is mandatory for CLDT, CLDR and CORE (all that can be routed on
GT).  Procedures apply to decrement the hop counter whenever GTT/AMF is
invoked to prevent loops.

There's also no reason why the hop counter value can't be transparently
passed between SCCP and SUA at the SG. The perceived "impossibility" again
comes from an incorrect view of the NIF as "SCCP or SUA-user", which doesn't
have the hop counter in the "user interface". But the NIF is any possible
interworking between SCCP and SUA at the SG.

Regards,

____________________________

Gery Verwimp
> SIEMENS ATEA
> ICN D CS D5
> Tel. : +32 14 25 3424
Fax : +32 14 25 3212
mailto:[email-masked]
____________________________________

-----Original Message-----
From: [email-masked] [mailto:[email-masked]]
Sent: dinsdag 28 augustus 2001 14:18
To: sigtran
Subject: [SUA Issue] Hop Counter

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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