Allied Telesis AT-S62 - Manual (Page 142)

Chapter 7: Port Parameter Commands
142 Section I: Basic Operations
yes, on, true, enabled Activates unknown
unicast packet rate limit
on the port. The values
are equivalent.
no, off, false, disabled Deactivates unknown
unicast packet rate limit
on the port. The values
are equivalent.
Description
This command controls the maximum number of ingress multicast,
broadcast, and unknown unicast packets the switch ports accept each
second. Packets exceeding the threshold are discarded. You can enable
the rate limiting threshold independently for each packet type. However,
the same threshold applies to all packet types.
The RATE parameter sets the packet limit. This limit applies to all the
ports. There can be only one packet limit value for the switch. Additionally,
the same packet limit applies to the three types of packets that you can
filter on.
The other parameters are used to toggle on and off the different filters. A
filter applies to all switch ports.
Here is an example. Assume that you set a rate limit of 5,000 packets and
you enable multicast and broadcast rate limiting. Each switch port will
accept up to 5,000 multicast packets and 5,000 broadcast packets each
second. If a port receives more than that of either type, it discards the
extra packets. Because the feature was not activated for unknown unicast
packets, their number is not restricted.
You must activate this feature on all existing ports in a switch. It cannot be
activated on a per-port basis. For example, if you are activating this
feature on an AT-8524M switch that has modules in its two expansion
slots, you could specify the ports as PORT=ALL or PORT=1-26. However,
if the switch did not have expansion modules, you would need to specify
the ports as PORT=1-24. The ALL option would not work in the latter case
since the expansion slots are empty.
Examples
The following command sets a rate limit of 40,000 ingress packets and
activates broadcast and multicast rate limiting on all switch ports:
set switch port=all rate=40000 bcastratelimiting=enabled
mcastratelimiting=enabled
The following command activates unicast rate filtering on all ports without
changing the current rate limit: