RTS DV-3400 Informações Técnicas descarregar pdf (Página 329)

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Port Traffic Controls

All-Traffic Rate-Limiting for the 5300xl, 3400cl and 6400cl Switches

Caution The ICMP protocol is necessary for routing, diagnostic, and error responses

in an IP network. ICMP rate-limiting is primarily used for throttling worm or

virus-like behavior, and should normally be configured to allow one to five

per cent of available inbound bandwidth to be used for ICMP traffic. This

feature should not be used to remove all ICMP traffic from a network.

Note Because all-traffic rate-limiting and ICMP rate-limiting operate similarly, the

CLI command for the all-traffic version of rate-limiting has been modified for

compatibility with the ICMP rate-limiting CLI command. Beginning with

software release E.10.02, these commands appear in the following format:

rate-limit [ all | icmp ]

For more on all-traffic rate-limiting, refer to the chapter titled “Port Traffic

Controls” in the Management and Configuration Guide for your switch

(January 2005 or greater).

Network Application. Apply ICMP rate-limiting on all connected interfaces

on the switch to effectively throttle excessive ICMP messaging from any

source. On edge interfaces, where ICMP traffic should be minimal, a threshold

of 1% of available bandwidth should be sufficient for most applications. On

core interfaces, such as switch-to-switch and switch-to-router, a maximum

threshold of 5% should be sufficient for normal ICMP traffic. (“Normal” ICMP

traffic levels should be the maximums that occur when the network is reboo-

ting.)

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