Define the ATM Traffic-Shaping Profile

When you are using an ATM encapsulation, you can configure a traffic-shaping profile that defines the following:

• Bandwidth utilization, which consists of either a constant rate, or a peak cell rate with sustained cell rate and burst tolerance
• Maximum queue length

These values are used in the ATM generic cell-rate algorithm, which is a leaky bucket algorithm that defines the short-term burst rate for ATM cells, the maximum number of cells that can be included in a burst, and the long-term sustained ATM cell traffic rate. Each individual VC has its own independent shaping parameters.

By default, the bandwidth utilization is unlimited; that is, unspecified bit rate (UBR) is used. Also, by default, buffer usage by VCs is unregulated. To define limits to bandwidth utilization on a point-to-point interface or to limit buffer use, include the shaping statement. For point-to-point interfaces, include the shaping statement at the [edit interfaces interface-name unit logical-unit-number] hierarchy level:

 [edit interfaces interface-name] 
 unit logical-unit-number {
 	 vci vpi-identifier.vci-identifier; 
 	 shaping { 
 	 	 (cbr rate | vbr peak rate sustained rate burst length); 
 	 	 queue-length number; 
 	 }
 }
 

For virtual circuits that are part of a point-to-multipoint interface, include the shaping statement at the [edit interfaces interface-name unit logical-unit-number family family address address] hierarchy level:

 [edit interfaces interface-name unit logical-unit-number family family] 
 address address {
 	 multipoint-destination destination-address {
 	 	 vci vpi-identifier.vci-identifier; 
 	 	 shaping { 
 	 	 	 (cbr rate | vbr peak rate sustained rate burst length); 
 	 	 	 queue-length number; 
 	 	 }
 	 }
 }