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Port Traffic Controls

Rate-Limiting

Configuring ICMP Rate-Limiting

The rate-limit icmp command controls inbound usage of a port by setting a limit

on the bandwidth available for inbound ICMP traffic.

Syntax: [no] int < port- list > rate-limit icmp < 0..100 >

Configures inbound ICMP traffic rate limiting. You can

configure a rate limit from either the global configuration

level (as shown above) or from the interface context level. The

no form of the command disables ICMP rate-limiting on the

specified interface(s). (Default: Disabled.)

1 - 99: Values in this range allow ICMP traffic as a percentage

of the bandwidth available on the interface.

0: This value causes an interface to drop all incoming ICMP

traffic, and is not recommended. Refer to the Caution on

page 13-10.

Note: ICMP rate-limiting is not supported on meshed ports.

(Rate-limiting can reduce the efficiency of paths through a

mesh domain).

For example, either of the following commands configures an inbound rate

limit of 1% on ports A3 - A5, which are used as network edge ports:

ProCurve(config)# int a3-a5 rate-limit icmp 1

ProCurve (eth-A3-A5)# rate-limit icmp 1

Using Both ICMP Rate-Limiting and All-Traffic Rate-Limiting

on the Same Interface

ICMP and all-traffic rate-limiting can be configured on the same interface.

All-traffic rate-limiting applies to all inbound or outbound traffic (including

ICMP traffic), while ICMP rate-limiting applies only to inbound ICMP traffic.

Note that if the all-traffic load on an interface meets or exceeds the currently

configured all-traffic inbound rate-limit while the ICMP traffic rate-limit on

the same interface has not been reached, then all excess traffic will be

dropped, including any inbound ICMP traffic above the all-traffic limit (regard-

less of whether the ICMP rate-limit has been reached). Suppose, for example:

■ The all-traffic inbound rate-limit on port “X” is configured at 55% of the

port’s bandwidth.

■ The ICMP traffic rate-limit on port “X” is configured at 2% of the port’s

bandwidth.

13-12

HP ProCurve Management And Configuration Guide

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