RTS DV-3400 Informações Técnicas descarregar pdf (Página 331)

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Port Traffic Controls

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

■ All ports belonging to a trunk configured for ICMP rate-limiting operate

according to the trunk configuration, regardless of the ICMP rate-limiting

state that existed on the port prior to its being added to the trunk. (While

a port is in a trunk, any ICMP rate-limiting previously configured for that

port is suspended, but remains in the switch configuration.)

■ Removing a port from a trunk returns the port to whatever ICMP rate-

limiting state existed on the port before it was put into the trunk.

Note A rate-limited trunk should include only ports on the same slot/module. A rate-

limited trunk configured across module boundaries is not supported and

produces unpredictable rate-limiting operation and results.

Using Both ICMP and All-Traffic Rate-Limiting on an Interface. ICMP

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

rate-limiting applies to all inbound traffic (including ICMP traffic), while ICMP

rate-limiting applies only to inbound ICMP traffic.

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

current all-traffic 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 (regardless of

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

■ The all-traffic limit on port “X” is configured at 55% of the port’s band-

width.

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

bandwidth.

If at a given moment:

■ inbound ICMP traffic on port “X” is using 1% of the port’s bandwidth, and

■ inbound traffic of all types on port “X” demands 61% of the ports’s

bandwidth,

then all inbound traffic above 55% of the port’s bandwidth, including any

additional ICMP traffic will be dropped as long as all inbound traffic combined

on the port demands 55% or more of the port’s bandwidth.

Note Under network stress conditions, an interface may allow occasional bursts of

inbound ICMP traffic forwarding that exceed the interface’s configured ICMP

traffic rate. Refer to “ICMP Rate-Limit Imposes an Average Bandwidth Limit”

on page 18.

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