Cell Relay Archive

[Paul Tichy <ptichy@baynetworks.com>]

Unless the ATM attached servers only talk to each other (unlikely) 
your Centillion's connection to the peer switch on the ATM network is 
probably NNI. If signalling is enabled (likely), then the Centillion 
may be using either IISP or PNNI. If it is using IISP, the connection 
to the peer switch will look like a UNI connection, with one side or 
the other configured to be the user part.

The connections to the servers are naturally UNI in which the 
Centillion is the network side.

Depending on how the switch was set up, basically UNI connections 
exist at either the Master Control Processor or the Ethernet switch 
cards themselves, for ATM circuit termination at the frame edge. This 
is accomplished through LEC or CLC (non-LANE) virtual ports. So yes, 
your Ethernet devices can communicate with the rest of the network 
even though the switch has an NNI link. This is actually a nice 
feature, because you can trunk multiple ATM ports together to get 
additional bandwidth.

Feel free to unicast additional inquiries to my e-mail address, or 
post them in comp.dcom.sys.bay-networks.

> Hi, folks!
> Basic question from a newbie.
>
> I have a Centillion switch with both ATM and Ethernet cards. This
> Centillion is connected to our ATM network, and we have servers
> connected to the Centillion through both ATM and Ethernet
> interfaces.
>
> My question is:
>
> 1. What is the type of the connection between the Centillion and
> the ATM network, UNI or NNI? I mean, if I have already a UNI
> connection between the server (with ATM card) and the Centillion,
> can I have another UNi interface between the Centillion and the ATM
> network?
> If I configure a NNI interface between the Centillion and the
> ATM network, what happens to the servers connected through an
> Ethernet interface, will it be possible for them to access other
> machines through the ATM network?
>
> I hope I made my problem clear, but if I didn't, please tell me.
>
> I'd appreciate any help.
>
>				Jane.
>
>  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>  %                                                %
>  %  Jane Ferreira Cunha                           %
>  %  Network Manager                               %
>  %  TELESC                                        %
>  %  Florianopolis - SC - Brasil                   %
>  %                                                %
>  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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Paul Tichy, Switching Specialist - Houston (281) 775-0624
Nortel/Bay Networks - Where Information Flows.
#include <std-disclaimer>
(Opinions expressed are purely my own, yada yada yada)
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