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5-2 SmartSwitch ATM User Guide
PVC Connections Virtual Ports and Static Connections
For this example, we specify CBR as the traffic type, then take the remaining defaults. Enter the show
trafficdescriptor
command to obtain the index number of the new traffic descriptor. In this example, the index
number is two (2).
SmartSwitch # show trafficdescriptor
========================================================================================
TD# Traff Desc QoS Peak Cell Rate Sust Cell Rate Max Burst Size Min Cell Aal Type
Type Type (Kb/s) (Kb/s) (Kb/s) Rate
CLP_0 CLP_0+1 CLP_0 CLP_0+1 CLP_0 CLP_0+1 (Kb/s)
=========================================================================================
1 NRTVBR 7 0 0 10872 5436 0 2052 0 0 5
2 CBR 2 1 0 100 0 0 0 0 0 5
176 NRTVBR 2 1 0 1585 0 0 0 0 0 5
SmartSwitch #
2. Use add pvc to create the PVC; specify the ports through which the connection is established, the
VPI/VCI pair to use with each port, and the traffic descriptor to use.
SmartSwitch # add pvc
ConnType(PTP) :
Port-1-Number() : 7a1
— Specify first port
Port-1-VPCI() : 0
— Specify its VPCI
Port-1-VCI() : 100
— Specify its VCI
Port-2-Number() : 7b2
— Specify second port
Port-2-VPCI() : 0
— Specify its VPCI
Port-2-VCI() : 100
— Specify its VCI
Port1-to-Port2TrafficDescriptorIndex() : 2
— We use our traffic descriptor
Port2-to-Port1TrafficDescriptorIndex() : 2
SmartSwitch #
The example above creates a PVC between ports 7a1 and 7b2 with VPCI/VCI = 0/100.
3. Plug the end nodes into the specified ATM SmartSwitch ports (7a1 and 7b2).
4. Configure each end node with the proper IP address, subnet mask, and VPCI/VCI pair = 0/100.
The end nodes can communicate with each other through the point-to-point PVC connection.
Note To create a PVC with a VPI greater than zero (0), you must change the default
assignment of bits used to specify VPIs and VCIs. The number of VPI bits
determine the available range of VPI numbers: Largest VPI number = 2
VPIbits
-1.
For example, if the number of VPI bits is three, the highest VPI that can be
specified is 2
3
-1 = (8 - 1) = 7. To change the available VPI numbers, use the set
portconfig
command (on a per-port basis) to alter the MaxVpiBits parameter
from its default of zero (0). Keep in mind that if VPI bits are increased VCI bits
are accordingly decreased. Fewer VCI bits results in fewer available VCIs per
VPI.
5.1.2 Point-to-Multipoint PVCs
Instructions in this section describe how to set up a point-to-multipoint connection through your ATM SmartSwitch.