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DES-7200 Configuration Guide Chapter 6 URPF Configuration
6-4
6.1.2.3 URPF monitoring
In order to conveniently monitor the drop rate of messages after URPF is enabled, DES-7200
can inform the user of such drop rate via Syslog and Trap. The mechanism will be detailed in
this section.
URPF monitoring has introduced the following concepts:
z Drop rate：The number of packets discarded due to URPF check within a specific period
of time divided by this time. Unit: packets/second (pps).
z Drop rate computation interval: The time interval from the previous calculation of drop
rate to the recalculation of drop rate.
z Drop rate sampling interval: The time interval for calculating the number of packets
dropped. This value most not be smaller than drop rate computation interval.
z Drop rate notification threshold: The maximum drop rate allowed. When the drop rate is
higher than this threshold, the user will be notified via Syslog or Trap. The user may also
adjust the drop rate notification threshold according to actual situations of the network.
z Drop rate notify hold-down time: The time interval between two successive notifications.
The user may adjust notify hold-down time according to actual situations of the network to
avoid frequent Log printing or Trap sending.
The following figure describes two successive computations of drop rate:
Fig 4 Two successive computations of drop rate
Main points of URPF monitoring:
z Drop rate computation
After URPF function is enabled, within the time interval of "0-drop rate sampling interval