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Traffic suppression

Created: Feb 21, 2020 02:37:33Latest reply: Feb 21, 2020 02:40:44 70 1 0 0
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Hi there,

I have a question about using traffic suppression. We have expected MAC flapping events, so we want to enable traffic suppression for unknown unicast packets in order to disable the default action as described in the note here https://support.huawei.com/enterprise/en/doc/EDOC1100065683/e90d1a10/understanding-traffic-suppression

However, I want to know how exactly the unknown unicast packets speed is calculated? Note for Storm Control says that the switch cannot distinguish unknown unicast packets from known unicast packets. The packet rate detected is the sum of the rates of unknown and known unicast packets https://support.huawei.com/enterprise/en/doc/EDOC1100065683/70044baa/understanding-storm-control

Is this note relevant for traffic suppression? Is the calculation the same?

Do I understand correctly that if the interface is configured with "unicast-suppression 90", then if the speed of any (known or unknown) unicast packets = 90% of the bandwidth of the interface, will the switch suppress traffic and discard excess traffic? Or does this command only monitor the speed of unknown unicast packets?

Would it be correct to enable such traffic suppression on uplinks between switches?

Thank you!


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Popeye_Wang
Admin Created Feb 21, 2020 02:40:44 Helpful(0) Helpful(0)

Hello,

1. Traffic suppression only takes effect for unknown unicast packets and can be counted based on the rate of unknown packets. Storm suppression does not distinguish known and unknown unicast packets, so the device counts the total rate of unknown and known unicast packets. When the storm control action is “block”, the device blocks only unknown unicast packets. The packet rate is calculated based on the ratio of the packet rate and the port bandwidth.

2. If "unicast-suppression90" is configured on the interface, when the rate of unknown unicast packets arrives 90% of interface bandwidth, the device will drop the exceeding unknown unicast packets.

3. Traffic suppression and storm suppression on an interface takes effect only for incoming packets on that interface. Traffic suppression is irrelevant to upstream and downstream traffic.

unicast-suppression:

https://support.huawei.com/hedex/pages/EDOC1100064949DEI0130R/04/EDOC1100064949DEI0130R/04/resources/dc/unicast-suppression.html?ft=0&fe=10&hib=6.15.5.16&id=unicast-suppression&text=unicast-suppression (interface view)&docid=EDOC1100064949

 

traffic suppression

Storm-control:

https://support.huawei.com/hedex/pages/EDOC1100064949DEI0130R/04/EDOC1100064949DEI0130R/04/resources/dc/storm-control.html?ft=0&fe=10&hib=6.15.5.11&id=storm-control&text=storm-control&docid=EDOC1100064949


traffic suppression

I hope this helps.

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Popeye_Wang
Popeye_Wang Admin Created Feb 21, 2020 02:40:44 Helpful(0) Helpful(0)

Hello,

1. Traffic suppression only takes effect for unknown unicast packets and can be counted based on the rate of unknown packets. Storm suppression does not distinguish known and unknown unicast packets, so the device counts the total rate of unknown and known unicast packets. When the storm control action is “block”, the device blocks only unknown unicast packets. The packet rate is calculated based on the ratio of the packet rate and the port bandwidth.

2. If "unicast-suppression90" is configured on the interface, when the rate of unknown unicast packets arrives 90% of interface bandwidth, the device will drop the exceeding unknown unicast packets.

3. Traffic suppression and storm suppression on an interface takes effect only for incoming packets on that interface. Traffic suppression is irrelevant to upstream and downstream traffic.

unicast-suppression:

https://support.huawei.com/hedex/pages/EDOC1100064949DEI0130R/04/EDOC1100064949DEI0130R/04/resources/dc/unicast-suppression.html?ft=0&fe=10&hib=6.15.5.16&id=unicast-suppression&text=unicast-suppression (interface view)&docid=EDOC1100064949

 

traffic suppression

Storm-control:

https://support.huawei.com/hedex/pages/EDOC1100064949DEI0130R/04/EDOC1100064949DEI0130R/04/resources/dc/storm-control.html?ft=0&fe=10&hib=6.15.5.11&id=storm-control&text=storm-control&docid=EDOC1100064949


traffic suppression

I hope this helps.

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