Cabletron Systems 9A100 manual Point-to-Multipoint PVCs, this is the forward descriptor

Switch Administration PVCConnections

4.5.2Point-to-Multipoint PVCs

Instructions in this section describe how to set up a point-to-multipoint connection through your SmartSwitch 9A100.

Example: Create a point-to-multipoint connection between a broadcasting workstation on port A1 and three other workstations connected to ports B2, B3, and C1.

1.Use add trafficdescriptor to create two new traffic descriptors, one for the forward direction, the other for the backward direction. For this example, for the forward traffic descriptor, we select UBR and accept the defaults.

SmartSwitch # add trafficdescriptor		<this is the forward descriptor
TrafficType(UBR)	:	<we use UBR for this example
TrafficDescriptorType(11)	:
PCRCLP01(100)	:	<we take the default values
PCRCLP0(0)	:
SCRCLP01(0)	:
SCRCLP0(0)	:
MBSCLP01(0)	:
MBSCLP0(0)	:
QOSCLASS(0)	:
AalType(5)	:
md1 #

However, on a point-to-multipoint connection there should be no traffic in the backward direction, so we define the backward traffic descriptor with its Cell Loss Priorities set to zero (0).

md1 #add trafficdescriptor		<this is the backward descriptor
TrafficType(UBR)	:
TrafficDescriptorType(11)	:
PCRCLP01(100)	:0	<we set everything to zero
PCRCLP0(0)	:
SCRCLP01(0)	:
SCRCLP0(0)	:
MBSCLP01(0)	:
MBSCLP0(0)	:
QOSCLASS(0)	:
AalType(5)	:
SmartSwitch #

2.Use show trafficdescriptor to obtain the new traffic descriptors’ index numbers.

SmartSwitch # show trafficdescriptor

==================================================================================

TD# Traff	Desc	QoS	Peak Cell Rate	Sust Cell	Rate	Max Burst Size	Aal
Type	Type		(Kb/s)	(Kb/s)		(Kb/s)	Type
			CLP_0 CLP_0+1	CLP_0 CLP_0+1		CLP_0 CLP_0+1

==================================================================================

2	CBR	2	1	0	100	0	0	0	0	5
6	UBR	11	0	0	100	0	0	0	0	5
7	UBR	11	0	0	0	0	0	0	0	5
176	NRTVBR	2	1	0	1585	0	0	0	0	5

SmartSwitch #

In the example above, traffic descriptor six (6) will be used in the forward direction, and traffic descriptor seven (7) will be used in the backward direction.

SmartSwitch 9A100 User Guide 4-13