Licensing Requirements and Limitations for Traffic Policing, Traffic Shaping, and Interface-based Rate Limiting
Involved Network Elements
Other network elements are not required.
Licensing Requirements
Traffic policing, traffic shaping, and interface-based rate limiting are basic features of a switch and are not under license control.
Feature Support in V200R019C10
All models of S2720, S5700, and S6700 series switches support traffic policing, traffic shaping, and interface-based rate limiting.
All models of S2720, S5700, and S6700 series switches support MQC-based traffic policing, queue-based traffic shaping, inbound interface-based rate limiting and outbound interface-based rate limiting. Only the S5720-EI, 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 support hierarchical traffic policing.
For details about software mappings, visit Hardware Query Tool and search for the desired product model.
Feature Limitations
- To limit the rate of packets from different VLANs, configure rate limiting based on VLAN IDs. When a traffic policy is applied to a VLAN, the traffic policy is valid for all interfaces in the VLAN.
- After rate limiting is configured on the device, Internet access may be slow and packet loss may occur on the downstream device. The rate limit needs to be set properly.
- Traffic policing, traffic shaping, and interface-based rate limiting are valid for data packets and protocol packets sent by the local device, and are invalid for protocol packets sent to the CPU.
- Traffic suppression in a VLAN, inbound interface-based rate limiting, MQC-based traffic policing, and ACL-based traffic-limit share CAR resources of the device. When CAR resources are insufficient, some of the preceding functions may fail to be configured. Run the display acl resource [ slot slot-id ] command to view the usage of CAR resources.
- The inbound traffic statistics function takes effect before interface-based rate limiting. That is, you cannot check whether interface-based rate limiting takes effect according to the traffic statistics. Run the display qos statistics interface interface-type interface-number inbound command on the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S to view traffic statistics after rate limiting is configured. In V200R010C00 and later versions, this command can be used on all switches to view traffic statistics after rate limiting is configured.
- When traffic policing and another flow action are defined in different traffic behaviors of the same traffic policy and priorities of matching traffic classifiers are different, if packets match multiple traffic classifiers, only the action corresponding to the high-priority traffic classifier takes effect. In this case, rate limiting may fail.
- Configuring traffic policing, traffic shaping, or interface-based rate limiting on a physical interface will affect the traffic rates of its sub-interfaces. The sub-interfaces share the rate limit with the physical interface.