Nortel Networks 450 manual describes the Rate Limiting Configuration screen fields

Using the BayStack 450 10/100/1000 Series Switch

	Table 3-19 describes the Rate Limiting Configuration screen fields.
Table 3-19.	Rate Limiting Configuration Screen Fields
Field	Description
Unit	Only appears if the switch is participating in a stack configuration. The field allows
	you to select the number of the unit you want to view or configure. To view or
	configure another unit, type its unit number and press [Enter], or press the
	spacebar on your keyboard to toggle the unit numbers.
Port	Indicates the switch port numbers that correspond to the field values in that row of
	the screen (for example, the field values in row 2 apply to switch port 2). Note that
	the values applied in the Switch or Stack row (last 2 rows) affect all standalone
	switch ports or all switch ports in a stack.
Packet Type	Allows you to select the packet types for rate-limiting or viewing.
	Default Value	Both
	Range	Both, Multicast, Broadcast
Limit	Sets the percentage of port bandwidth allowed for forwarding the packet types
	specified in the Packet Type field. When the threshold is exceeded, any additional
	packets (specified in the Packet Type field) are discarded1.
	Default Value	None
	Range	None, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%
Last 5 Minutes	This read-only field indicates the percentage of packets (of the type specified in
	the Packet Type field) received by the port in the last 5 minutes. This field provides
	a running average of network activity and is updated every 15 seconds.
	Note that this field indicates the receiving port’s view of network activity,
	regardless of the rate-limiting setting.
Last Hour	This read-only field indicates the percentage of packets (of the type specified in
	the Packet Type field) received by the port in the last hour. This field provides a
	running average of network activity and is updated every 5 minutes.
	Note that this field indicates the receiving port’s view of network activity,
	regardless of the rate-limiting setting.
Last 24 Hours	This read-only field indicates the percentage of packets (of the type specified in
	the Packet Type field) received by the port in the last 24 hours. This field provides
	a running average of network activity and is updated every hour.

Note that this field indicates the receiving port’s view of network activity, regardless of the rate-limiting setting.

1rate-limiting is disabled if this field is set to None. This allows you to select and view the percentage of specific packet types present in the network, without inadvertently limiting the forwarding rate.

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