Riverstone Networks WICT1-12 用户手册

31-2   Riverstone Networks RS Switch Router User Guide   Release 8.0 

Service Facility Rate Limiting Types

  Service Configuration

Once created, 

 becomes bound to the policy and the policy becomes bound to the IP address specified in the 

policy. Because it is bound, it can not be used at another IP address. A new policy has to be created with the same rate 
limits. That requires more commands. With the 

 facility, the policy need only be configured once for any 

number of addresses. Additionally, an ACL does not have to be created. As seen in the second example, the 

 

command handles the filtering by including a source address using 

.

Currently 

 supports rate limiting and ACLs.

31.1 SERVICE FACILITY RATE LIMITING TYPES

There are four types of rate-limiting used in the 

 facility:

Aggregate rate limiting – The aggregate rate limiting service is used for aggregate flows and executed exclusively in 
the hardware.

Some line cards do not support aggregate rate limiting. Do not choose aggregate 
rate limiting if a line card does not support this type of limiting.

Flow-aggregate rate limiting – The flow-aggregate rate limiting service is used for aggregate flows and executed in 
a combination of hardware and software.

Per-flow rate limiting – Use the per-flow rate limiting service to limit individual flows.

Burst-safe rate limiting – Use the burst-safe rate limiting service if Committed Access Rates (CARs) (guaranteed 
transmissions) or burst rates (non-guaranteed transmissions) are required to limit traffic.

Burst-safe is supported on line cards that support aggregate rate limiting.

Port rate limiting must be disabled on a port to use burst-safe rate limiting on that 
port.

A traffic profile is used to define the traffic characteristics before an upper limit is assigned. The traffic profile is 
created using an ACL, which can utilize any combination of the parameters supported in IP ACL. A rate limiting policy 
can then be defined by using the ACL and traffic rate limitations. You define the action to be taken on the traffic that 
exceeds the upper limit. For example, dropping packets. Except for port rate limiting, the rate limiting policy is then 
applied to a logical IP interface.

Rate limiting policies work only in one direction. That is, only the traffic coming into the interface to which a policy 
is applied will be subject to rate limiting (except for output port rate limiting policies, which are applied to egress 
ports). If both incoming and outgoing traffic to a network or subnet needs to be rate limited, then you should create 
separate policies to be applied to each interface.