Configuring Traffic Suppression on an Interface
Context
Excess broadcast, unknown multicast, unknown unicast, known multicast, and known unicast packets will cause broadcast storms or heavy traffic. You can configure traffic suppression for a specified type of packet on an interface to limit the rate of these packets.
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 support two traffic suppression modes on interfaces: number of packets per second (pps) and number of bits per second (bit/s). The default mode is pps. The bit/s mode is more precise than the pps mode. Other models only support the pps mode.
You can configure suppression on broadcast, unknown multicast, and unknown unicast, known multicast, and known unicast traffic on the same interface.
Pre-configuration Tasks
Before configuring traffic suppression on an interface, configure link layer protocol parameters for interfaces to ensure that the link layer protocol status on the interfaces is Up.
Procedure
- Run system-view
The system view is displayed.
- (Optional) Run suppression mode { by-packets | by-bits }
The traffic suppression mode is set.
Only 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 support this command.
If the traffic suppression mode set in the system view is pps, the cir parameter cannot be specified when you set the maximum traffic rate on an interface.
If the traffic suppression mode set in the system view is bit/s, the packets parameter cannot be specified when you set the maximum traffic rate on an interface.
- Run interface interface-type interface-number
The interface view is displayed.
- Run { broadcast-suppression | multicast-suppression | unicast-suppression | known-multicast-suppression | known-unicast-suppression } { percent-value | cir cir-value [ cbs cbs-value ] | packets packets-per-second }
Traffic suppression is configured.
When traffic suppression is configured on interfaces of 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, the traffic suppression mode must be the same as that configured in the system view; otherwise, the system displays an error message.
- Run { broadcast-suppression | multicast-suppression | unicast-suppression } block outbound
The interface is configured to block outgoing packets.