Licensing Requirements and Limitations for Traffic Suppression and Storm Control

Other network elements are not required.

Traffic suppression and storm control are basic features of a switch and is not under license control.

All models of S2720, S5700, and S6700 series switches support Traffic Suppression and Storm Control.

For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Features supported in different views

Table 1 lists the traffic suppression and storm control features supported in the interface and VLAN views.

**Table 1** Features supported in different views
View	Traffic Suppression and Storm Control Features Supported by the Switch
Interface view	Traffic suppression for broadcast, unknown multicast, unknown unicast, known multicast, and known unicast packets Storm control for broadcast, unknown multicast, and unknown unicast packets Traffic suppression for ICMP packets
VLAN view	Traffic suppression for broadcast packets

Difference between Traffic Suppression and Storm Control

Traffic suppression and storm control use different methods to control traffic:
- In traffic suppression, rate thresholds are configured for incoming packets on interfaces. The system discards the traffic exceeding the threshold and forwards the traffic within the threshold. In this way, the system limits the traffic rate in an acceptable range. In addition, traffic suppression can block outgoing packets on interfaces.
- In storm control, rate thresholds are configured for incoming packets only on interfaces. When the traffic exceeds the threshold, the system rejects the packets of this particular type on the interface or shuts down the interface.
For incoming packets of the same type on an interface, you can configure either traffic suppression or storm control.

Other feature limitations

For the S2720-EI, S5720I-SI, S5720-LI, S5720S-LI, S5720S-SI, S5720-SI, S5730S-EI, S5730-SI, S6720-LI, S6720S-LI, S6720S-SI, and S6720-SI, at most three types of traffic suppression or storm control can take effect on an interface: traffic suppression for broadcast/known multicast/unknown multicast/known unicast/unknown unicast packets, storm control for broadcast/unknown multicast/unknown unicast packets, and traffic suppression triggered by MAC address flapping. For example, if traffic suppression for broadcast packets, storm control for broadcast packets, and traffic suppression for known unicast packets are configured on an interface, traffic suppression is not triggered on the interface where MAC address flapping occurs on the interface.
For S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S, if traffic suppression is configured as the rate limit in pps and the configured value is less than 24, traffic suppression is performed based on 24. If the configured value is greater than or equal to 24, traffic suppression is performed based on the configured value.