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Riverstone Networks RS Switch Router User Guide Release 8.0 8-7
ATM Configuration Guide Traffic Shaping
Constant Bit Rate (CBR) This service category provides a guaranteed constant bandwidth specified by the
Peak Cell Rate (PCR). This service requires only the PCR value. The Sustainable
Cell Rate (SCR) and Maximum Burst Size (MBS) values are ignored. This service
category is intended for applications that require constant cell rate guarantees such
as uncompressed voice or video transmission.
Non Real-Time Variable Bit Rate This service category provides a guaranteed constant bandwidth (specified by the
SCR), but also provides for peak bandwidth requirements (specified by the PCR).
This service category requires the PCR, SCR, and MBS options and is intended
for applications that can accommodate bursty traffic with no need for real-time
guarantees.
Real-Time Variable Bit Rate This service category provides a guaranteed constant bandwidth (specified by the
SCR), but also provides for peak bandwidth requirements (specified by the PCR).
This service category requires the PCR, SCR, and MBS options and is intended
for applications that can accommodate bursty real-time traffic such as compressed
voice or video.
Available Bit Rate (ABR) This service category guarantees a minimum cell rate only, intended for best effort
applications. This service category is currently unsupported.
After you define a service category, you apply it to a VC. An important concept when applying service profiles is the
concept of inheritance. Since a service profile can be applied to a virtual channel, virtual path, or an ATM port, the
actual connection can inherit the service profile from any one of the three. The virtual channel will inherit the service
profile that is directly applied on it. If no service profile was applied to the virtual channel, the connection will inherit
the service profile applied to the virtual path. If no service profile was applied to the virtual path, then the connection
will inherit the service profile applied to the ATM port. If no service profile was applied to the port, then the default
service class UBR is applied.
The following example defines a service profile named ‘cbr1m’ where CBR is the service category and peak cell rate
is set to 10000 kcells/second. The service profile is then applied to the VC (VPI=0, VCI=100) on ATM port at.1.1:
To display information about the service you configured, use the
atm show service
command as shown in the
following example:
rs(config)# atm define service cbr1m srv-cat cbr pcr 10000
rs1(config)# atm apply service cbr1m port at.1.1.0.100
rs# atm show service cbr1m
cbr1m
Service Class: CBR
Peak Bit Rate: 10000 Kbits/sec (23584 CPS)
Encapsulation Type: LLC Multiplexing
Traffic Type: RFC-1483, multi-protocol
F5-OAM: Responses Only