Cell Relay Archive

[chandrak <chandrak@future.futsoft.com>]

Hi Eike,

> A connection is being established from a source device across a privte
> network where switches are connected via P-NNI to a destination device.
> Will P-NNI signaling or routing part change the routing tables of a
> switch?

> And if, when (upon receiving a SETUP message, or ...)? When are
> these routing table entries deleted again (upon receiving a RELEASE
> message)? Or are routing tables entries not changed in connection setup
> phase at all and I should think of them as beeing permanent physical
> connections, that means predefined?

The hardware routing tables (i.e the mapping of the incoming VPI /VCI to the 
outgoin' VPI/VCI) are changed on the receipt of a SETUP / CONNECT message. 
The programming is done. The entries in the table are deleted when a 
RELEASE/ RELEASE COMPLETE message is received.

PVC are altogether of a different kind. They have nothing to do with P-NNI 
protocol as such. Usually PVC's are setup using the Network Manager (SNMP) 
or configured when the system comes up. These are active until deleted by 
another SNMP request. SoftPVC is  another kind of connection setup, these 
are also configured using Net Management and PNNI facilitates establishment 
of SoftPVC.

Further, PNNI in turn the information regarding the different nodes in 
topology ( the PTSE database), which it uses to route an incoming call setup 
from the user source. This database is periodically updated  to accomodate 
the changes in the network traffic / parameters.

Hope this helps.

 --chandra
_________________________________________________________________

Chandrasekar K           Ph: 4342166, 4340323 Ext 294
Future Software Pvt Ltd    Chennai      India
http://www.futsoft.com
__________________________________________________________________