Lucent Technologies CAJUN M770, User Manual

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Chapter 7 Managing Module Hardware
Cajun M770 ATM Switch User’s Guide 91
Note: Under normal circumstances, the early packet discard threshold should not
be changed. Before attempting to change the thresholds, contact Lucent
Technologies Technical Support.
The Cell Loss Priority (CLP) mechanism allows low priority cells (with CLP set to 1)
to be discarded first. The CLP threshold cannot be set by the user.
Displaying the packet discard threshold for modules
To display the current packet discard thresholds for all modules, use the
hardware
packetdiscard
command.
The information displayed is the percentage threshold that is currently set for Early
Packet Discard (EPD). The default EPD threshold is 80%. When the switch’s buffers
are more full than the EPD threshold then the switch module will discard NEW
AAL5 frames on UBR circuits.
Changing the packet discard thresholds for modules
You can change the default thresholds for packet discard.
• Decreasing the percentage will cause packets to be discarded at an earlier stage
during congestion.
• Increasing the percentage will cause the congestion to reach a higher level
before the packet discard threshold is reached and packets are discarded.
• To disable packet discard enter 0 for EPD.
Note:
Under normal circumstances, the packet discard thresholds should not be
changed. Before attempting to change the thresholds, contact Lucent Technologies
Technical Support.
To change the packet discard thresholds for an module, use the
hardware
packetdiscard <epd%>
command.
Command:
M15-155s8:/>hardware packetdiscard
Output:
EPD 80%
Command:
M15-155s8:/>hardware packetdiscard <epd%>
Example:
M15-155s8:/>hardware packetdiscard 70
Parameters:
<epd%>
The new percentage threshold for EPD.