Rate Limiting Configuration - Avaya 3500 series Getting Started

Managing Ethernet ports using ACLI

Rate limiting configuration

The Rate Limiting feature lets you configure the threshold limits for broadcast and multicast
packets ingressing on a port for a given time interval. The Ethernet Routing Switch 3500 Series
drops packets received above the threshold value if the traffic ingressing on the port exceeds
the threshold. The hardware restrictions on this platform do not allow you to determine if the
traffic from a port is the cause of excess broadcast or multicast traffic. Consequently you cannot
perform port-specific actions such as disabling a port. You can generate a trap to detect the
excess traffic or you can configure the switch to store a message in the system log when the
traffic on the port exceeds the threshold value. This message in the system log conveys that
some traffic to the switch is dropped.
When the volume of either packet type is high, placing severe strain on the network (often
referred to as a "storm"), you can set the forwarding rate of those packet types to not exceed
a specified percentage of the total available bandwidth. The pps (Packets Per Second) value
you set is a small amount of the maximum value of pps for the maximum available bandwidth
that is 262143 pps.
Important:
All Rate Limiting configuration settings are applied across the entire unit. You cannot set
some ports in the unit to limit broadcast traffic with a value of X pps and some other ports
in the same to limit multicast traffic with a value of Y pps.
You can view the rate limiting configuration settings and statistics with the show rate-limit
command or the show running-config ACLI command. You can also limit the percentage
of multicast traffic, or broadcast traffic, or both with rate-limit ACLI command.
Displaying rate-limit configuration using ACLI
Display rate-limit configuration to view settings and statistics.
Procedure
1. Logon to the ACLI in Privileged EXEC mode.
2. At the command prompt, enter the following command:
3.
Example
The following figure displays sample output from the show rate-limit command.
3510GT-PWR+show rate-limit
Packet Type
76 Getting Started
show rate-limit
Limit
Comments? infodev@avaya.com
March 2013