Cabletron Systems 6500 - Manual (Page 97)

SmartSwitch 6500 User Guide 7-7
Traffic Management Traffic Management Capabilities
7.1.4 EFCI, EPD, and RM Cell Marking
To control switch congestion, the SmartSwitch 6500 implements standard resource management cell (RM-cell)
marking, explicit forward congestion indicator cell marking (with backward RM cell marking), and early packet
discard (EPD). These congestion control schemes are triggered when the number of cells within shared memory
reaches user-definable thresholds. Use the
switchtrafficcongestion commands to view and set these thresholds.
For example, enter the show switchtrafficcongestion command.
Smart6500 # show switchtrafficcongestion
Switch Traffic Congestion Parameters
==============================================================================
Low EPD Threshold : 209715 cells
High EPD Threshold : 104857 cells
CLP1 Discard Threshold : 131072 cells
RM Cell Marking Enable : OFF
EFCI Cell Marking Enable : OFF
Explicit Rate Marking Enable : OFF
Smart6500 #
For most types of traffic, EPD triggering is tied to the low EPD threshold. Signaling traffic, however, is tied to the high
EPD threshold; this assures that signaling packets are discarded only when congestion is most severe.
Use the set switchtrafficcongestion command to change thresholds for EPD and to enable or disable RM and
EFCI cell marking. For example:
Smart6500 # set switchtrafficcongestion
LowEPDWatermark(4096) :
HighEPDWatermark(4096) :
CLP1_DiscardWatermark(4096) :
RMCellMarkingEnable(enable) :
ExplicitRateMarkingEnable(enable) :
EFCIMarkingEnable(enable) :
Smart6500 #