Cabletron Systems 9032578-05 manual Aggregate Rate Limiting, Define a port rate limit policy to

Chapter 21: QoS Configuration Guide

To define a port rate limit policy, enter one of the following commands in Configure mode:

Define a port rate limit policy to	rate-limit <name> port-level input rate
limit incoming traffic on a port.	<rate-limit> port <port list> { drop-packetsno-
	actionlower-prioritylower-priority-
	except-controltos-precedence-rewrite
	<val1> tos-precedence-rewrite-lower-
	priority <val2> }
Define a port rate limit policy to	rate-limit <name> port-level output port
limit outgoing traffic on a port.	<port list> rate <rate-limit> drop-packets

Note that for output port policies, the only action that you can specify if traffic exceeds the specified rate is to drop packets.

If you configure output port policies, all types of outgoing IP traffic will be rate limited, including control traffic. If you do not want control traffic to be subject to rate limiting, enter the following command in Configure mode:

Specify that control traffic is not subject to output port rate limiting.

rate-limit <name> port-level slot <slot- number> ignore-control-priority

Because you specify a slot number in the above command, output port rate limiting policies on any port on the specified slot will not be applied to control traffic.

Aggregate Rate Limiting

Use an aggregate rate limiting policy if an aggregation of flows needs to be limited to a particular rate. For example, you can use aggregate rate limiting to rate limit traffic to or from a particular subnet.

Note: You cannot apply an aggregate rate limiting policy to an interface that spans ports on more than one line card. For example, you cannot apply an aggregate rate limiting policy to the interface ‘ip2,’ if ‘ip2’ interfaces to a VLAN that consists of ports et.1.(1-4) and et.2.(1-4).

To configure aggregate rate limiting policies, you must first enable aggregate rate limiting mode on the SSR (see “Rate Limiting Modes” on page 303).

SmartSwitch Router User Reference Manual 305