Allied-telesis AT-S62 Manual de usuario Pagina 118

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Chapter 6: Port Parameters
118 Section I: Basic Operations
Setting the Rate Limit
This feature sets the maximum number of ingress packets the switch ports
accept each second. Packets exceeding the threshold are discarded. You
can enable the rate limiting threshold independently for multicast,
broadcast, and unknown unicast packets. However, the same threshold
applies to all packet types.
To configure this feature, you must enter a rate limit. This establishes the
maximum number of packets the individual ports will accept per second.
This limit applies to all ports and to all three packet types. There can be
only one packet limit value for the switch.
Here is an example. Assume that you set a rate limit of 5,000 packets and
you activate multicast and broadcast rate limiting. Each switch port will
accept up to 5,000 ingress multicast packets and 5,000 ingress broadcast
packets each second. If a port receives more of either type, it discards the
extra packets. Since the feature was not activated for unknown unicast
packets, ports do not restrict their number. (An unknown unicast packet is
a packet with a MAC address not stored in the switch’s MAC address
table.)
To set rate limiting, perform the following procedure:
1. From the Main Menu, type 1 to select Port Configuration.
The Port Configuration menu is shown in Figure 21 on page 106.
2. From the Port Configuration menu, type 1 to select Port Configuration.
The following prompt is displayed:
Enter port-list ->
3. Enter any port on the switch.
This feature cannot be set on a per-port basis. You can enter any port
or range of ports and the change will apply to all switch ports.
The Port Configuration menu is shown in Figure 23 on page 109.
4. Type L to select Rate Limit.
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