Quick Reference Guide

PowerConnect B-Series TI24X Configuration Guide 431
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ACL-based rate limiting using traffic policies
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The software allows you to add a reference to a non-existent TPD in an ACL statement and to bind
that ACL to an interface. The software does not issue a warning or error message for non-existent
TPDs.
Use the no form of the command to delete a traffic policy definition. Note that you cannot delete a
traffic policy definition if it is currently in use on a port. To delete a traffic policy, first unbind the
associated ACL.
<TPD name> is the name of the traffic policy definition. This value can be 8 or fewer alphanumeric
characters.
rate-limit fixed specifies that the traffic policy will enforce a strict bandwidth.
<cir value> is the committed information rate in kbps. This value can be from 64 – 1000000
Kbps.
exceed-action <action> specifies the action to be taken when packets exceed the configured cir
value. Refer to “Specifying the action to be taken for packets that are over the limit” on page 433.
The count parameter is optional and enables ACL counting. Refer to “ACL and rate limit counting”
on page 434.
Configuring ACL-based adaptive rate limiting
Use the procedures in this section to configure ACL-based adaptive rate limiting. Before configuring
this feature, see what to consider in “Configuration notes and feature limitations” on page 427.
Table 70 lists the configurable parameters for ACL-based adaptive rate limiting.
If a port receives more than the configured bit or byte rate in a one-second interval, the port will
either drop or forward subsequent data in hardware, depending on the action you specify.
To implement the ACL-based adaptive rate limiting feature, first create a traffic policy then
reference the policy in an extended ACL statement. Lastly, bind the ACL to an interface. Follow the
steps below.
TABLE 70 ACL-Based adaptive rate limiting parameters
Parameter Definition
Committed Information Rate (CIR) The guaranteed kilobit rate of inbound traffic that is allowed on a port.
Committed Burst Size (CBS) The number of bytes per second allowed in a burst before some packets will
exceed the committed information rate. Larger bursts are more likely to
exceed the rate limit. The CBS must be a value greater than zero (0). Dell
recommends that this value be equal to or greater than the size of the
largest possible IP packet in a stream. For PowerConnect B-Series TI24X
devices, the CBS value is specified in kilobits.
Peak Information Rate (PIR) The peak maximum kilobit rate for inbound traffic on a port. The PIR must
be equal to or greater than the CIR.
Peak Burst Size (PBS) The number of bytes per second allowed in a burst before all packets will
exceed the peak information rate. The PBS must be a value greater than
zero (0). Dell recommends that this value be equal to or greater than the
size of the largest possible IP packet in the stream. For PowerConnect
B-Series TI24X devices, the PBS value is specified in kilobits.