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6-4 SmartSwitch ATM User Guide
Traffic Management Capabilities Traffic Management
Use the command show caceqbwallocscheme to view the current CAC policies used by each port for each class of
service.
SmartSwitch # show caceqbwallocscheme
PortNumber(ALL) :
===========================================================
Port# Alloc Scheme
for
CBR RTVBR NRTVBR UBR ABR
===========================================================
7A1 CON CON CON LIB CON
7A2 CON CON CON LIB CON
7A3 CON CON CON LIB CON
7A4 CON CON CON LIB CON
7B1 CON CON CON LIB CON
7B1.3 CON CON CON LIB CON
7B2 CON CON CON LIB CON
7B3 CON CON CON LIB CON
CPU CON CON CON LIB CON
CPU.1 CON CON CON LIB CON
SmartSwitch #
Note The CAC affects both physical and virtual ports as indicated in the example above
(7b1.3 is a virtual port).
If there are a large number of connections of a particular class of service on a particular port, and these connections
begin to slow down and show signs of congestion, use the
set caceqbwallocscheme command to change the CAC
policy to moderate or conservative.
SmartSwitch # set caceqbwallocscheme
PortNumber() : 7a1
SeriveCategory(CBR) : ubr
AllocScheme(LIBERAL) : moderate
SmartSwitch #
Use the set cacserviceclassbw command to change the amount of bandwidth on a per-port basis that the CAC
recognizes as available for each class of service. Available bandwidth for a class of service is specified as a percent of
total port bandwidth. For example, to increase the bandwidth for CBR calls on port
7a1 to 20 percent of total port
bandwidth, enter the following
SmartSwitch # set cacserviceclassbw
PortNumber() : 7a1
MaxBandWidth_In_Percentage-CBR(1) : 20
— Increase to 20%
MaxBandWidth_In_Percentage-RT_VBR(1) :
MaxBandWidth_In_Percentage-NRT_VBR(7) :
MaxBandWidth_In_Percentage-UBR(89) : 70
— Decrease by 20%
MaxBandWidth_In_Percentage-ABR(1) :
SmartSwitch #
Notice in the example above that the total percentage for all service classes on the port must not exceed 100 percent.
Furthermore, if the
set cacserviceclassbw command is used to alter a physical port, the change also affects any
virtual ports on that physical port.