200 Mbps Bandwidth Limit, 5 ms Burst Duration
If a 200 Mbps bandwidth limit is configured with a 5 ms burst size, the calculation
becomes
200 Mbps x 5 ms = 125 Kbytes
, which is approximately 83 1500-byte packets.
If the 200 Mbps bandwidth limit is configured on a Gigabit Ethernet interface, the burst
duration is
125000 bytes / 1 Gbps = 1 ms
at the Gigabit Ethernet line rate.
200 Mbps Bandwidth Limit, 600 ms Burst Duration
If a large burst size is configured at 600 ms with the bandwidth limit configured at
200 Mbps, the calculation becomes
200 Mbps x 600 ms = 15 Mbytes
. This creates a
burst duration of 120 ms at the Gigabit Ethernet line rate. The average bandwidth rate in
1 second becomes
200 Mbps + 15 Mbytes = 320 Mbps
, which is much higher than the
configured bandwidth limit at 200 Mbps. This example shows that a larger burst size
can affect the measured bandwidth rate.
Related
Documentation
•
Policer Implementation Overview on page 25
•
Understanding the Benefits of Policers and Token Bucket Algorithms on page 28
35
Copyright © 2016, Juniper Networks, Inc.
Chapter 5: Implementing Traffic Policers on EX 9200 Switches
Summary of Contents for EX9200 Series
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