RTS DV-3400 Informações Técnicas descarregar pdf (Página 337)

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Port Traffic Controls

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

tion, an outbound interface can become oversubscribed by traffic

received from multiple ICMP rate-limited interfaces. In this case, the

actual rate for traffic on the rate-limited interfaces may be lower than

configured because the total traffic load requested to the outbound inter-

face exceeds the interface’s bandwidth, and thus some requested traffic

may be held off on inbound.

■ Optimum Rate-Limiting Operation: Optimum rate-limiting occurs with

64-byte packet sizes. Traffic with larger packet sizes can result in perfor-

mance somewhat below the configured inbound bandwidth. This is to

ensure the strictest possible rate-limiting of all sizes of packets.

■ Heavy Memory Usage: Combinations of intensive QoS, rate-limiting,

and/or IDM ACL service demands on a switch can impose heavy memory

usage on the switch’s dynamic hardware rule processor, and can some-

times result in slower system performance. In such cases, moving support

for some of the service load to other devices can improve performance.

■ Outbound Traffic Flow: Configuring ICMP rate-limiting on an interface

does not control the rate of outbound traffic flow on the interface.

■ Traffic Filters on Rate-Limited Interfaces: Configuring a traffic filter

on an interface does not prevent the switch from including filtered traffic

in the bandwidth-use measurement for either type of rate-limiting (ICMP

or all). That is, where rate-limiting and traffic filtering are configured on

the same interface, the inbound, filtered traffic is included in the band-

width measurement for calculating when the limit has been reached.

Traffic filters include:

• ACLs

• Source-Port filters

• Protocol filters

• Multicast filters

■ Determining the 5300xl Switch Port Number Used in ICMP Port

Reset Commands To Enable Excess ICMP Traffic Notification

Traps and Event Log Messages: Use the internal port numbers

described in this section with the setmib command described on page 17.

The port number included in the command corresponds to the internal

number the switch maintains for the designated port, and not the port’s

external (slot/number) identity. To match the port’s external slot/number

to the internal port number, use the walkmib ifDescr command, as shown

in the following figure:

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