Packet Drop Logging - Lenovo Flex System Fabric CN4093 Application Manual

Packet Drop Logging

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Packet drop logging allows you to monitor network deficiencies by generating
syslog messages for packet drops in the CPU queues. By default, the switch will
generate such messages once every 30 minutes, specifying the type of traffic, queue
data rate and queue number on which the drops occurred, such as:
Apr 19 11:27:35 172.31.37.200 NOTICE Protocol control discards: ARP
Broadcast packets are received at rate higher than 200pps, hence are
discarded on queue 5.
To enable or disable packet drop logging, use the following commands:
CN 4093(config)# [no] logging pdrop enable
You can adjust the logging interval between 0 and 30 minutes using the following
command:
CN 4093(config)# logging pdrop interval <0-30>
Setting the logging interval to 0 will log packet drops immediately (with up to 1
second delay), and will ignore further drops on the same queue during the next 2
minutes.
Setting the logging interval to a greater value (1 – 30 minutes), regularly displays
packet drop information at the designated time intervals. Once the packet drops
stop, or if new packet drops are encountered only within 2 minutes after a syslog
message, the switch does not display any more messages.
Chapter 12: Quality of Service
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