Re: Conceptual doubt between an ASP and SGP
Ajay Garg <[email protected]> Thu, 13 Mar 2014 17:04:37 +0530
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Message-ID | <CAHP4M8UdY8cLjfr2cyjoNtaOLOUUrMQDu_OG5nHqDiu8wXOHuA@mail.gmail.com> |
--===============7053797809720201693== Content-Type: multipart/alternative; boundary=001a11c3c1e49593bc04f47b56d9 --001a11c3c1e49593bc04f47b56d9 Content-Type: text/plain; charset=ISO-8859-1 Thanks a ton David for the clarifications !! On Thu, Mar 13, 2014 at 4:23 PM, David Laight <[email protected]>wrote: > M3UA can't itself transfer your messages directly from N1 to N3. > > It is worth remembering that M3UA carries the interface between MTP3 and > its user parts > > (typically ISUP and SCCP) over IP. > > IPSP seems a 'bodge' that more or less works and allows the userparts (at > different pointcodes) > > to send message to each other. > > > > In your case the SCCP code at node N2 could forward messages that arrive > from N1 onwards > > to N3. Whether the SCCP you have can be configured to do that is another > matter. > Yep, we are in a position to configure Global-Title-Translation (GTT) rules on N2, which will enable us to "route" messages from N1 -> N3, and N3 -> N1. However, the above makes us wonder on the following question :: Assuming all nodes (N1, N2, N3) are pure SIGTRAN-nodes (no SS7 nodes), is it ever required at all to make N2 a SGP ? (Of course, that would also mean changing the links between N1 <-> N2, and N2 <-> N3 to ASP <-> SGP types) Looking forward to more clarifications !! Thanks and Regards, Ajay > > > David > > > > > > *From:* Sigtran [mailto:[email protected]] *On Behalf Of *Ajay Garg > *Sent:* 13 March 2014 10:05 > *To:* [email protected]; [email protected] > *Subject:* Re: [Sigtran] Conceptual doubt between an ASP and SGP > > > > Brian, > > RFC-2719 seems to be too technical for the use-case we are trying to > understand :) > > I would rather present (a simplified version of) our use-case. > > * > We have 3 nodes - N1, N2, N3. > > * > We need to transfer messages in-between N1 and N3. > > * > There is an IPSP-IPSP association each between between N1 <-> N2, and N2 > <-> N3 (but no IPSP-IPSP association between N1 <-> N3). > > * > Also, provisions for GTT are available at each of N1, N2 and N3. > > > Theoritically/Practically, would the above configuration work? Or is it > necessary to have a SGP configured at N2? > > Looking forward to clarifications. > > Thanks and Regards, > Ajay > > > > > > On Thu, Mar 13, 2014 at 12:47 PM, Brian F. G. Bidulock < > [email protected]> wrote: > > Ajay, > > Please see comments below... > > Ajay Garg wrote: (Thu, 13 Mar 2014 11:48:19) > > > Hi all. > > I am an absolute newbie in telecom domain, so kindly forgive me if I > > sound incredibly stupid. > > From what I understand, an ASP is a process running on an AS, and a > SGP > > is a process running on a SG. > > Not quite. See RFC 4666 "1.2 Terminology" for a definition of ASP, > AS, SGP and SG. > > > > Each ASP <-> SGP link is a SCTP connection. > > Also, I understand that SGP is responsible for message-routing, while > > an ASP is merely an end-point for a SCTP connection. > > Given that, are there any extra differences between a ASP and SGP (in > > addition to the routing-capabilities of a SGP)? > > I will be grateful for any pointers/clarifications. > > RFC 4666 describes for 124 pages the differences between ASP and SGP. > > BTW, it is not an SGP per se that has routing capabilities, but an > SG, where the SG is made up of some SGP, an SS7 stack and a > interworking function. > > See also RFC 2719 "Framework Architecture for Signaling Transport" > for a better overview of what's going on. > > --brian > > -- > Brian F. G. Bidulock > [email protected] > http://www.openss7.org/ > > > > > -- > Regards, > Ajay > > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 > 1PT, UK > Registration No: 1397386 (Wales) > > P *Please consider the environment and don't print this e-mail unless you > really need to* > > -- Regards, Ajay --001a11c3c1e49593bc04f47b56d9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Thanks a ton David for the clarifications !!<br><div class= =3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Thu, Mar 13, 2014 at= 4:23 PM, David Laight <span dir=3D"ltr"><<a href=3D"mailto:David.Laight= @aculab.com" target=3D"_blank">[email protected]</a>></span> wrote= :<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex"> <div link=3D"blue" vlink=3D"purple" lang=3D"EN-GB"> <div> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">M3UA can’t itself t= ransfer your messages directly from N1 to N3.<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">It is worth remembering t= hat M3UA carries the interface between MTP3 and its user parts<u></u><u></u= ></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">(typically ISUP and SCCP)= over IP.<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">IPSP seems a ‘bodge= ’ that more or less works and allows the userparts (at different poin= tcodes)<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">to send message to each o= ther.<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d"><u></u> <u></u></spa= n></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">In your case the SCCP cod= e at node N2 could forward messages that arrive from N1 onwards<u></u><u></= u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d">to N3. Whether the SCCP y= ou have can be configured to do that is another matter.</span></p></div></d= iv> </blockquote><div><br></div><div>Yep, we are in a position to configure Glo= bal-Title-Translation (GTT) rules on N2, which will enable us to "rout= e" messages from N1 -> N3, and N3 -> N1.<br><br><br><br><br> </div><div>However, the above makes us wonder on the following question :: = <br><br></div><div>Assuming all nodes (N1, N2, N3) are pure SIGTRAN-nodes (= no SS7 nodes), is it ever required at all to make N2 a SGP ?<br>(Of course,= that would also mean changing the links between N1 <-> N2, and N2 &l= t;-> N3 to ASP <-> SGP types)<br> <br><br></div><div>Looking forward to more clarifications !!<br><br><br></d= iv><div>Thanks and Regards,<br></div><div>Ajay<br></div><div><br></div><div= ><br></div><div> </div><blockquote class=3D"gmail_quote" style=3D"marg= in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div link=3D"blue" vlink=3D"purple" lang=3D"EN-GB"><div><p class=3D"MsoNorm= al"><span style=3D"font-size:11.0pt;font-family:"Calibri","s= ans-serif";color:#1f497d"><u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d"><u></u> <u></u></spa= n></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d"> &= nbsp; David<u><= /u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d"><u></u> <u></u></spa= n></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri","sans-serif";color:#1f497d"><u></u> <u></u></spa= n></p> <div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm = 4.0pt"> <div> <div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm = 0cm 0cm"> <p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"= ;Tahoma","sans-serif"" lang=3D"EN-US">From:</span></b><span = style=3D"font-size:10.0pt;font-family:"Tahoma","sans-serif&q= uot;" lang=3D"EN-US"> Sigtran [mailto:<a href=3D"mailto:sigtran-bounces@iet= f.org" target=3D"_blank">[email protected]</a>] <b>On Behalf Of </b>Ajay Garg<br> <b>Sent:</b> 13 March 2014 10:05<br> <b>To:</b> <a href=3D"mailto:[email protected]" target=3D"_blank">bidulo= [email protected]</a>; <a href=3D"mailto:[email protected]" target=3D"_blank">s= [email protected]</a><br> <b>Subject:</b> Re: [Sigtran] Conceptual doubt between an ASP and SGP<u></u= ><u></u></span></p> </div> </div><div><div class=3D"h5"> <p class=3D"MsoNormal"><u></u> <u></u></p> <div> <div> <div> <div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Brian,<u></u><u></u><= /p> </div> <p class=3D"MsoNormal">RFC-2719 seems to be too technical for the use-case = we are trying to understand :)<u></u><u></u></p> </div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">I would rather presen= t (a simplified version of) our use-case.<u></u><u></u></p> </div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">*<br> We have 3 nodes - N1, N2, N3.<u></u><u></u></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">* <br> We need to transfer messages in-between N1 and N3.<u></u><u></u></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">*<br> There is an IPSP-IPSP association each between between N1 <-> N2, and= N2 <-> N3 (but no IPSP-IPSP association between N1 <-> N3).<u>= </u><u></u></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">*<br> Also, provisions for GTT are available at each of N1, N2 and N3.<br> <br> <br> <u></u><u></u></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Theoritically/Practic= ally, would the above configuration work? Or is it necessary to have a SGP = configured at N2?<br> <br> <u></u><u></u></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Looking forward to cl= arifications.<br> <br> <u></u><u></u></p> </div> <div> <p class=3D"MsoNormal">Thanks and Regards,<br> Ajay<u></u><u></u></p> </div> <div> <p class=3D"MsoNormal"><u></u> <u></u></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u> <u></u><= /p> <div> <p class=3D"MsoNormal">On Thu, Mar 13, 2014 at 12:47 PM, Brian F. G. Bidulo= ck <<a href=3D"mailto:[email protected]" target=3D"_blank">bidulock@o= penss7.org</a>> wrote:<u></u><u></u></p> <p class=3D"MsoNormal">Ajay,<br> <br> Please see comments below...<br> <br> Ajay Garg wrote: &n= bsp; (Thu, 13 Mar 2014 11:48:19)<u= ></u><u></u></p> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">> Hi = all.<br> > I am an absolute newbie in telecom domain, so kindly forg= ive me if I<br> > sound incredibly stupid.<br> > From what I understand, an ASP is a process running on an= AS, and a SGP<br> > is a process running on a SG.<u></u><u></u></p> </div> <p class=3D"MsoNormal">Not quite. See RFC 4666 "1.2 Terminology&= quot; for a definition of ASP,<br> AS, SGP and SG.<u></u><u></u></p> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br> > Each ASP <-> SGP link is a SCTP connection.<br> > Also, I understand that SGP is responsible for message-ro= uting, while<br> > an ASP is merely an end-point for a SCTP connection.<br> > Given that, are there any extra differences between a ASP= and SGP (in<br> > addition to the routing-capabilities of a SGP)?<br> > I will be grateful for any pointers/clarifications.<u></u= ><u></u></p> </div> <p class=3D"MsoNormal">RFC 4666 describes for 124 pages the differences bet= ween ASP and SGP.<br> <br> BTW, it is not an SGP per se that has routing capabilities, but an<br> SG, where the SG is made up of some SGP, an SS7 stack and a<br> interworking function.<br> <br> See also RFC 2719 "Framework Architecture for Signaling Transport"= ;<br> for a better overview of what's going on.<br> <span style=3D"color:#888888"><br> <span>--brian</span><br> <br> <span>--</span><br> <span>Brian F. G. Bidulock</span><br> <span><a href=3D"mailto:[email protected]" target=3D"_blank">bidulock@op= enss7.org</a></span><br> <span><a href=3D"http://www.openss7.org/" target=3D"_blank">http://www.open= ss7.org/</a></span></span><u></u><u></u></p> </div> <p class=3D"MsoNormal"><br> <br clear=3D"all"> <br> -- <br> Regards,<br> Ajay<u></u><u></u></p> </div> </div> </div></div></div> </div> <br><font color=3D"#484830" face=3D"Tahoma"></font> <div><font size=3D"1" color=3D"#484830" face=3D"Tahoma">Registered Address = Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK<br>Registrat= ion No: 1397386 (Wales)</font></div> <div><font color=3D"#008000" face=3D"Arial"><font size=3D"5" face=3D"Webdin= gs"> <p align=3D"center"><font color=3D"#008000" face=3D"Arial"><font size=3D"1"= ><font face=3D"Webdings">P<b> </b></font><b>Please consider the environment= and don't print this e-mail unless you really need to</b></font></font= ></p> </font></font></div> <br></div> </blockquote></div><br><br clear=3D"all"><br>-- <br>Regards,<br>Ajay<br> </div></div> --001a11c3c1e49593bc04f47b56d9-- --===============7053797809720201693== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Sigtran mailing list [email protected] https://www.ietf.org/mailman/listinfo/sigtran --===============7053797809720201693==--