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ATM-LSR do they use OSPF/IS-IS or PNNI??

From: Javier Antich <javier.antich@telindus.es>
Date: Wed, 18 Apr 2001 11:02:59 +0200
X-MIME-Autoconverted: from quoted-printable to 8bit by cell.onecall.net id HAA12915



> Hi
> 
> If all ATM switches are MPLS capables, that is, they are able to run IP
> routing protocols like OSPF/IS-IS then they behave like neighbouring
> routers and use those routing protocols and LDP for label assignment and
> therefore for LSP establishment. However if you have two ATM-LSR which
> need to communicate accross a standar ATM cloud, you may have  either aVP
> established, what would lead us to the previous case, or use SVCs
> established by normal ATM signalling (i.e. PNNI) and SVC-to-LSP binding by
> using VCID Notification. In this case the ATM-LSRs would be using both
> OSPF/IS-IS and PNNI.
> 
> 
>                                           ^   ^
> ==============ooo====(.)v(.)====ooo=====
> Javier Antich Romaguera
> Network Consultant
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> 
> 
> -----Mensaje original-----
> De:	MP LS [SMTP:stagempls@hotmail.com]
> Enviado el:	miércoles 18 de abril de 2001 10:02
> Para:	mpls-ops@mplsrc.com; mpls@UU.NET
> Asunto:	ATM-LSR do they use OSPF/IS-IS or PNNI??
> 
> Hello all,
> 
> I have some questions becasue something is verry strange to me.
> I just assumed that ATM-LSRS used an IP routing protocol (IGP) just for 
> finding the topology of the network.
> 
> But last i read an doccument and there they described that When you change
> 
> an ATM switch to an ATM-LSR it will use PNNI instead of a IGP for IP. Can 
> anyone make this clear for me??
> 
> Thanks a lot.
> 
> Greetings,
> 
> Niels Sitters.
> 
> 
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