What is Topology of Storm

Traffic suppression aims at controlling traffic rate within an acceptable range by limiting the incoming and outgoing traffic on interfaces. When the rate of incoming broadcast, multicast, or unknown unicast packets exceeds the threshold, the switch discards the packets exceeding the threshold and only allows the packets within the threshold. Take traffic suppression for unknown unicast packets for example. The traffic suppression threshold of unknown unicast packets is 100 pps. That is, the switch allows only 100 packets to pass within one second, and discards the excess packets. If traffic suppression is configured for broadcast, multicast, or unknown unicast packets in the outbound direction, the switch blocks all packets of this type. That is, the interface does not forward packets of this type. Storm control aims at controlling broadcast storms. The switch only controls incoming traffic on interfaces. If the average rate of unknown unicast packets within the storm control interval is higher than the upper threshold, the switch blocks packets on the interface or shuts down the interface according to the configured penalty action. If the interface has been blocked, when the rate of packets received by the interface falls below the lower threshold, the switch unblocks the interface. If the interface has been shut down, you must manually run the undo shutdown command to enable the interface. Take storm control for unknown unicast packets for example. The upper threshold of storm control for unknown unicast packets is 100 pps, the lower threshold is 20 pps, and storm control interval is 5 seconds. If the interface receives more than 500 (100 x 5) packets within 5 seconds, the switch shuts down the interface. The interface can receive packets when its status recovers to Up. Alternatively, the switch blocks all unknown unicast packets on the interface until the next 5 seconds expire. When the number of packets received by the interface falls below 100 (20 x 5), the switch starts to forward the unknown unicast packets on the interface. For the incoming packets of the same type on an interface, only either of the traffic suppression or storm control can be configured.

For S series switches, you can run the display storm-control [ interface ] command in any view to check information about storm control on an interface.

For S series switches (except S1700 switches): Traffic suppression and storm control are two security technologies used to limit rates of broadcast, unknown multicast, and unknown unicast packets to prevent storms caused by these packets. Traffic suppression limits traffic rates using traffic rate thresholds, while storm control prevents traffic storms by shutting down interfaces. You can run the following commands to configure traffic suppression: [HUAWEI] interface gigabitethernet 1/0/0 [HUAWEI-GigabitEthernet1/0/0] broadcast-suppression cir 100 //Configure broadcast traffic suppression and set the CIR, that is the allowed rate at which broadcast traffic can pass through, to 100 kbit/s. [HUAWEI-GigabitEthernet1/0/0] multicast-suppression 80 //Configure unknown multicast traffic suppression and limit the rate of unknown multicast packets to 80%. [HUAWEI-GigabitEthernet1/0/0] unicast-suppression cir 100 //Configure unknown unicast traffic suppression and set the CIR, that is the allowed rate at which unknown unicast traffic can pass through, to 100 kbit/s. [HUAWEI-GigabitEthernet1/0/0] quit To block outgoing packets on an interface, run the following commands: [HUAWEI] interface gigabitethernet 1/0/0 [HUAWEI-GigabitEthernet1/0/0] broadcast-suppression block outbound //Block outgoing broadcast packets on the interface. [HUAWEI-GigabitEthernet1/0/0] multicast-suppression block outbound //Block outgoing unknown multicast packets on the interface. [HUAWEI-GigabitEthernet1/0/0] unicast-suppression block outbound //Block outgoing unknown unicast packets on the interface. [HUAWEI-GigabitEthernet1/0/0] quit You can run the following commands to configure storm control: [HUAWEI] interface gigabitethernet 1/0/0 [HUAWEI-GigabitEthernet1/0/0] storm-control broadcast min-rate 1000 max-rate 2000 //Configure storm control on broadcast packets. [HUAWEI-GigabitEthernet1/0/0] storm-control multicast min-rate 1000 max-rate 2000 //Configure storm control on unknown multicast packets. [HUAWEI-GigabitEthernet1/0/0] storm-control unicast min-rate 1000 max-rate 2000 //Configure storm control on unknown unicast packets. [HUAWEI-GigabitEthernet1/0/0] storm-control action block //Set the storm control action to block. [HUAWEI-GigabitEthernet1/0/0] storm-control enable log //Configure the device to record a log when detecting a storm. [HUAWEI-GigabitEthernet1/0/0] storm-control interval 90 //Set the interval for detecting storms. [HUAWEI-GigabitEthernet1/0/0] quit Note: If the storm control action on an interface is block, the interface restores the normal forwarding state when the traffic falls below the lower threshold. If the storm control action is shutdown, the interface cannot restore automatically and you need to run the undo shutdown command to restore it manually.

You are advised to deploy antivirus software that is optimized for virtualization platforms, such as Symantec SEP 12.1 and later. (1) Preventing antivirus storms. A control center provides unified scheduling for antivirus tasks. Set automatic virus removal and database update to be performed during low traffic hours. (2) Sharing scan results and improving system efficiency. The HASH value in a VM's scan result file is sent to the control center, which sends this value to other VMs. The antivirus software on other VMs stores a HASH value list locally.