[nsp] ATM switching on a 7200

[Oliver Boehmer (oboehmer)]

Hi Kostas,

you are correct. No Cisco router is able to switch ATM *cells*. The ATM
interface driver (or the hardware directly) always re-assembles the
cells, and then we work from there (i.e. route/bridge/whatever).

CEF is, as you know, an IP forwarding technology. using the expression
"cef-switching" might confuse in this context.

	oli


> -----Original Message-----
> From: Kostas Anagnopoulos [mailto:kostas.anagnopoulos at oteglobe.net] 
> Sent: Freitag, 7. Februar 2003 14:26
> To: cisco-nsp at puck.nether.net
> Subject: [nsp] ATM switching on a 7200
> 
> 
> 
> 
> Hi,
> 
> Correct me if i'm wrong but i don't think a router can switch 
> a cell based
> only on the vp value,due to the
> fact that it has to turn cells into a packet as it receives 
> them from an ATM
> interface,segment it
> again into cells and transmit out to an ATM interface.The 
> router needs an ip
> address to bind the packets
> into a pvc,or some sort of bridging between ATM interfaces 
> which i don't
> think is working for a whole vp.
> A possible solution could be to terminate (rather than trying to cell
> switch) the pvp's on the router sw7200 interfaces and 
> cef-switch on the
> individual pvc's.
> 
> Regards
> 
> Kostas
> 
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