R3303-HP HSR6800 Routers ACL and QoS Configuration Guide

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Rate limit
Rate limit supports controlling the rate of inbound traffic and outbound traffic.
The rate limit of a physical interface specifies the maximum rate for forwarding packets (including critical
packets).
Rate limit also uses token buckets for traffic control. With rate limit configured on an interface, all packets
to be sent through the interface are handled by the token bucket for rate limiting. If enough tokens are in
the token bucket, packets can be forwarded. Otherwise, packets are put into QoS queues for congestion
management. In this way, the traffic passing the physical interface is controlled.
Figure 12 Rate limit implementation
The token bucket mechanism limits traffic rate when accommodating bursts. It allows bursty traffic to be
transmitted if enough tokens are available. If tokens are scarce, packets cannot be transmitted until
efficient tokens are generated in the token bucket. It restricts the traffic rate to the rate for generating
tokens.
Rate limit controls the total rate of all packets on a physical interface. It is easier to use than traffic policing
in controlling the total traffic rate on a physical interface.
Configuration task list
Task Remarks
Configuring traffic
policing
Configuring traffic policing by using the policy approach
Configuring traffic policing by
using the non-policy
approach
Configuring CAR-list-based traffic policing
Configuring ACL-based traffic policing
Configuring traffic policing for all traffic
Configuring GTS
Configuring GTS by using the policy approach
Configuring GTS by using the
non-policy approach
Configuring ACL-based GTS
Configuring queue-based GTS
Configuring GTS for all traffic