Cabletron Systems ZX-250 manual Min for CBR queue

Switch Administration TrafficManagement

For example, enter the show porttrafficcongestion command to view current buffer utilization.

SmartCell ZX # show porttrafficcongestion
PortNumber(ALL)						:
Port ID	Queue 1		Queue 2		Queue 3		Queue 4
	Min	Max	Min	Max	Min	Max	Min	Max

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

A1	20	1000	20	2000	20	1000	20	16384
A2	20	1000	20	2000	20	1000	20	16384
A3	20	1000	20	2000	20	1000	20	16384
A4	20	1000	20	2000	20	1000	20	16384
B1	20	1000	20	2000	20	1000	20	16384
B2	20	1000	20	2000	20	1000	20	16384
B3	20	1000	20	2000	20	1000	20	16384
B4(CPU)	20	1000	20	2000	20	1000	20	16384
C1	20	1000	20	2000	20	1000	20	16384
C2	20	1000	20	2000	20	1000	20	16384
C3	20	1000	20	2000	20	1000	20	16384
C4	20	1000	20	2000	20	1000	20	16384
D1	20	1000	20	2000	20	1000	20	16384
D2	20	1000	20	2000	20	1000	20	16384
D3	20	1000	20	2000	20	1000	20	16384
D4	20	1000	20	2000	20	1000	20	16384
SmartCell ZX #

Min and Max are thresholds set on a per-queue, per-port basis and are measured in cells (53 bytes). The Min threshold is the amount of buffer space guaranteed to a call of a particular QoS on the corresponding port. The Max threshold is the maximum amount of buffer space that a call of a particular QoS is allowed on the corresponding port.

QoS corresponds to the queues as follows:

UQueue 1 — Constant Bit Rate (CBR)

UQueue 2 — Real Time Variable Bit Rate (rt-VBR)

UQueue 3 — Non-real Time Variable Bit Rate (Nrt-VBR)

UQueue 4 — Unspecified Bit Rate (UBR)

If calls of a particular QoS type are being dropped on a particular port, use the set porttrafficcongestion command to raise the port’s queue Min threshold.

For example, to change both the Min and Max amounts of buffer space used for CBR calls on port a3, enter the following:

SmartCell ZX # set porttrafficcongestion
Port(ALL)	: a3
Queue1MinimumCellCounter(20)	: 1000 < Min for CBR queue
Queue2MinimumCellCounter(20)	:
Queue3MinimumCellCounter(20)	:
Queue4MinimumCellCounter(20)	:
Queue1MaximumCellCounter(1000)	: 10000 < Max for CBR queue
Queue2MaximumCellCounter(2000)	:
Queue3MaximumCellCounter(1000)	:
Queue4MaximumCellCounter(16384)	:
SmartCell ZX #

SmartCell ZX-250 User Guide 4-21