STRIDE SE-SW5U - Message Rate Limiting

Message Rate Limiting
Message Rate Limiting can prevent your switch and network from being overwhelmed by
high volumes of broadcast and multicast messages. When enabled on a port, message rate
limiting controls the percentage of messages which are allowed to be broadcast or multicast.
Messages over the limit are dropped.
Poorly configured applications and devices or malicious users can flood your network
with broadcast packets that are forwarded to all ports and can quickly consume most of a
network’s bandwidth. The managed switch provides some protection from such “broadcast
storms” by allowing you to limit the rate at which these messages are accepted by the switch.
For each port, you may choose to limit the rate of broadcast and multicast messages accepted.
Messages over the preset limit will be discarded.
Limiting is done based on message type and priority. Broadcast and multicast messages are
prioritized (by IP ToS) then limited to approximately the following rates:
Priority Limit
Background
10% of link capacity
Normal
20% of link capacity
Expedited
40% of link capacity
Urgent
80% of link capacity
The exact limit depends on link speed.
Messages directly addressed to a single station (unicast messages) are not affected by message
rate limiting.
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Chapter 4 - Managed Switch Software Setup
Stride Industrial Ethernet Switches User Manual 2nd Ed. Rev. A