Cell Relay Archive

[manfredi@arl.bna.boeing.com]

In article
<Pine.A32.3.91.970605161235.16282A-100000@genius.tisl.soft.net>,  Ajay
Sood -B7317 -Systems -GE <sood@genius.tisl.soft.net> wrote:

>
> I have a question regarding routing in native ATM.
> ( this is routing for connection setup and not vpi/vci)
> How are routing tables in a switch maintained and configured
> Do we have something like ranges of ATM addresses on a physical port.
> How is mapping of physical ports to ATM addresses done.
> Is this dynamic (or the switches need to be configured once a network
> arrangement is done)
> Like I want to communicate one ATM device to another native ATM device
> then how will the switch know which physical port should the connection
> request be forwarded to or will it be forwarded to all ports?
> Is it something like a particular port is reserved for a range of ATM
> addresses or is there some learning mechanism by broadcasting the request?

You probably want to read the first three sections of the PNNI document.
It is available at the atmforum FTP site, and it's called af-pnni-0055.000
(or at least that's the most recent one I'm aware of).

Routes are determined with a dynamic scheme which goes on in the
background. The topology is hierarchical, with different levels of "peer
groups" defined. Topology information is passed up an down between a
peer group and its "parent peer group." If links between two peer groups
with _different_ parent groups exist, this information can also be used
to establish direct shortcuts between the two different lower level peer
groups.

Anyway, this stuff is done in the background by means of something called
the Hello protocol. This is analogous to the Interior Gateway Protocol
and Exterior Gateway Protocol schemes used in the Internet.

Bert
manfredi@arl.bna.boeing.com

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