Difference between traffic suppression and storm control

Created: Nov 6, 2019 07:35:17Latest reply: Nov 7, 2019 06:40:38 67 2 0 0
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Hello community
I would like to know the difference between traffic suppression and storm control.
Thanks
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WheatGrass
Created Nov 7, 2019 06:40:38 Helpful(0) Helpful(0)

Understanding Traffic Suppression


Traffic suppression prevents broadcast storms caused by broadcast, unknown multicast, and unknown unicast packets, and is configured in the following views:

  • Interface view

    Controls the bandwidth percentage, packets per second, and bits per second of incoming packets.

    A switch monitors rates of these packets on the interface and compares the rates with the thresholds. When the rate of incoming traffic reaches the threshold, the switch discards excess traffic.

  • Outbound interface view

    Blocks outgoing broadcast packets, unknown multicast packets, and unknown unicast packets.

  • VLAN view

    Limits the bits per second for broadcast packets.

    A switch monitors broadcast packet rates in the same VLAN and compares the rates with the thresholds. When the traffic rate in the VLAN reaches the threshold, the switch discards excess traffic.

By default, the device supports traffic suppression triggered by MAC address flapping. When MAC address flapping detection is enabled, traffic suppression will be triggered on the interface where MAC address flapping occurs. That is, the rate of unknown unicast packets is limited to 50% of the interface bandwidth.

icon-note.gif NOTE:

If traffic suppression on unknown unicast packets is configured using the unicast-suppression command and the rate limit of unknown unicast packets is not 100% of the interface bandwidth, or storm control on unknown unicast packets is configured using the storm-control command, traffic suppression will not be triggered on an interface where MAC address flapping occurs.


You may refer to the below link: https://support.huawei.com/hedex/hdx.do?lib=EDOC1000177841AEG11278&docid=EDOC1000177841&lang=en&v=09&tocLib=EDOC1000177841AEG11278&tocV=09&id=dc_fd_storm_0005&tocURL=resources/dc/dc_fd_storm_0005.html&p=t&fe=1&ui=3&keyword=traffic%2Bsuppression


Understanding Storm Control


Storm control prevents broadcast storms caused by broadcast packets, unknown multicast packets, and unknown unicast packets. It is configured in the interface view to limit the number of packets per second.

In a detection interval, a switch with storm control configured monitors the average rates of incoming packets on an interface and compares the average rates with the thresholds. When the rate of a particular type of packets exceeds the threshold allowed for these packets, the switch takes a storm control action on the interface.

Storm control actions include block and shutdown. An interface that is blocked or shut down can be recovered in the following ways:

  • When the average rates of incoming packets on a blocked interface fall below the lower thresholds, the interface is unblocked to forward packets.

  • If the action is shutdown, manually unblock the interface or enable the interface to automatically recover to the Up state.

icon-note.gif NOTE:

When detecting unicast packets, a switch does not distinguish unknown unicast packets from known unicast packets. The packet rate detected is the sum of the rates of unknown and known unicast packets. When the storm control action is block, the switch blocks only the unknown unicast packets. This rule also applies to multicast packets.


You may refer to the below link: https://support.huawei.com/hedex/hdx.do?lib=EDOC1000177841AEG11278&docid=EDOC1000177841&lang=en&v=09&tocLib=EDOC1000177841AEG11278&tocV=09&id=dc_fd_storm_0006&tocURL=resources/dc/dc_fd_storm_0006.html&p=t&fe=1&ui=3&keyword=storm%2Bcontrol

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Popeye_Wang
Admin Created Nov 6, 2019 07:43:23 Helpful(0) Helpful(0)

HI,
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.

From iknow:http://support.huawei.com/iknow/
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All Answers
Popeye_Wang
Popeye_Wang Admin Created Nov 6, 2019 07:43:23 Helpful(0) Helpful(0)

HI,
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.

From iknow:http://support.huawei.com/iknow/
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WheatGrass
WheatGrass Created Nov 7, 2019 06:40:38 Helpful(0) Helpful(0)

Understanding Traffic Suppression


Traffic suppression prevents broadcast storms caused by broadcast, unknown multicast, and unknown unicast packets, and is configured in the following views:

  • Interface view

    Controls the bandwidth percentage, packets per second, and bits per second of incoming packets.

    A switch monitors rates of these packets on the interface and compares the rates with the thresholds. When the rate of incoming traffic reaches the threshold, the switch discards excess traffic.

  • Outbound interface view

    Blocks outgoing broadcast packets, unknown multicast packets, and unknown unicast packets.

  • VLAN view

    Limits the bits per second for broadcast packets.

    A switch monitors broadcast packet rates in the same VLAN and compares the rates with the thresholds. When the traffic rate in the VLAN reaches the threshold, the switch discards excess traffic.

By default, the device supports traffic suppression triggered by MAC address flapping. When MAC address flapping detection is enabled, traffic suppression will be triggered on the interface where MAC address flapping occurs. That is, the rate of unknown unicast packets is limited to 50% of the interface bandwidth.

icon-note.gif NOTE:

If traffic suppression on unknown unicast packets is configured using the unicast-suppression command and the rate limit of unknown unicast packets is not 100% of the interface bandwidth, or storm control on unknown unicast packets is configured using the storm-control command, traffic suppression will not be triggered on an interface where MAC address flapping occurs.


You may refer to the below link: https://support.huawei.com/hedex/hdx.do?lib=EDOC1000177841AEG11278&docid=EDOC1000177841&lang=en&v=09&tocLib=EDOC1000177841AEG11278&tocV=09&id=dc_fd_storm_0005&tocURL=resources/dc/dc_fd_storm_0005.html&p=t&fe=1&ui=3&keyword=traffic%2Bsuppression


Understanding Storm Control


Storm control prevents broadcast storms caused by broadcast packets, unknown multicast packets, and unknown unicast packets. It is configured in the interface view to limit the number of packets per second.

In a detection interval, a switch with storm control configured monitors the average rates of incoming packets on an interface and compares the average rates with the thresholds. When the rate of a particular type of packets exceeds the threshold allowed for these packets, the switch takes a storm control action on the interface.

Storm control actions include block and shutdown. An interface that is blocked or shut down can be recovered in the following ways:

  • When the average rates of incoming packets on a blocked interface fall below the lower thresholds, the interface is unblocked to forward packets.

  • If the action is shutdown, manually unblock the interface or enable the interface to automatically recover to the Up state.

icon-note.gif NOTE:

When detecting unicast packets, a switch does not distinguish unknown unicast packets from known unicast packets. The packet rate detected is the sum of the rates of unknown and known unicast packets. When the storm control action is block, the switch blocks only the unknown unicast packets. This rule also applies to multicast packets.


You may refer to the below link: https://support.huawei.com/hedex/hdx.do?lib=EDOC1000177841AEG11278&docid=EDOC1000177841&lang=en&v=09&tocLib=EDOC1000177841AEG11278&tocV=09&id=dc_fd_storm_0006&tocURL=resources/dc/dc_fd_storm_0006.html&p=t&fe=1&ui=3&keyword=storm%2Bcontrol

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