Le 21/08/2011 17:04, Darren New nous fit lire :
> Nobody used TP4 over a network that will work fine with TP0.

Unless the "network" is only a part of the path.
(Interconnecting 2 Lan/Ethernet with pair of X.25 links: the system on
the lan are probably better using TP4 and the X.25 gateways just have to
push the clnp packets in the X.25 links. On these gateways, it's
probably simpler to have the application use also a TP4, even if they
could simplify the connections crossing only X.25 to use only a TP0).

Now, if I could have convinced the customer to use IS-IS on the
redundent four gateways per lan, that would have saved a few nightmares
about the routing table on the lan... and less money for my company on
the long run ;-)

Regarding IP-over-ATM, it depends from where you look (as you are
smashing the model inside another instance):
From IP (layer 3), ATM is simply a link (or set of links) (layer 2)
From ATM, it is providing nearly level 4 service. (and even more)

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