Quick Reference Guide

PowerConnect B-Series TI24X Configuration Guide 429
53-1002269-02
ACL-based rate limiting using traffic policies
17
Setting the maximum number of traffic policies supported
on a Layer 3 device
If desired you can adjust the maximum number of active traffic policies that a Layer 3 device will
support. To do so, enter commands such as the following at the Global CONFIG level of the CLI.
PowerConnect(config)# system-max hw-traffic-conditioner 25
PowerConnect(config)# write memory
PowerConnect(config)# reload
NOTE
You must save the configuration and reload the software to place the change into effect.
Syntax: [no] system-max hw-traffic-conditioner <num>
<num> is a value from 0 to n, where 0 disables hardware resources for traffic policies, and n is a
number up to 1024. The maximum number you can configure depends on the configuration and
available memory on your device. If the configuration you enter causes the device to exceed the
available memory, the device will reject the configuration and display a warning message on the
console.
NOTE
Dell does not recommend setting the system-max for traffic policies to 0 (zero), since this renders
traffic policies ineffective.
ACL-based rate limiting using traffic policies
ACL-based rate limiting provides the facility to limit the rate for IP traffic that matches the permit
conditions in extended IP ACLs. This feature is available in the Layer 2 and Layer 3 code.
To configure ACL-based rate limiting, you create individual traffic policies, then reference the traffic
policies in one or more ACL entries (also called clauses or statements). The traffic policies become
effective on ports to which the ACLs are bound. Refer to “About traffic policies” on page 427.
When you configure a traffic policy for rate limiting, the device automatically enables rate limit
counting, similar to the two-rate three-color marker (trTCM) mechanism described in RFC 2698 for
adaptive rate limiting, and the single-rate three-color marker (srTCM) mechanism described in RFC
2697 for fixed rate limiting. This feature counts the number of bytes and trTCM or srTCM
conformance level per packet to which rate limiting traffic policies are applied. Refer to “ACL and
rate limit counting” on page 434.
You can configure ACL-based rate limiting on the following interface types:
• physical Ethernet interfaces
• virtual interfaces
• trunk ports
• specific VLAN members on a port (New in 02.3.03 – refer to “Applying an IPv4 ACL to specific
VLAN members on a port (Layer 2 devices only)” on page 385
• a subset of ports on a virtual interface (New in 02.3.03 – refer to “Applying an IPv4 ACL to a
subset of ports on a virtual interface (Layer 3 devices only)” on page 385.)