Configuring Ethernet Ports Setting Ethernet Parameters for All Port Types
OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 1-13
Note. Enabling multicast flood rate limiting with the interfaces flood multicast command will limit IP
Multicast Switching (IPMS) and non-IPMS multicast traffic.
Configuring the Peak Flood Rate Value
The interfaces flood rate command is used to configure the peak flood rate value on a specific port, a
range of ports, or all ports on a switch (slot) in megabits per second. Note the following regarding the
configuration of this value:
• The interfaces flood rate command configures a maximum ingress flood rate value for an interface.
This peak flood rate value is applied to flooded (unknown destination address, broadcast) and multi-
cast traffic combined. For example, if an interface is configured with a peak flood rate of 500 Mbps,
the 500 Mbps limit is shared by all traffic types.
• On all the OmniSwitch platforms the flood rate can be accurately configured for 512-byte packets. The
flood rate cannot be accurately set for smaller or larger sized packets. The accuracy/resolution is
limited because the switch makes an internal assumption of packet size when it converts
bits/seconds to packets/seconds for the hardware.
• Although you can configure a flood rate equal to the line speed you should not do so. Alcatel-Lucent
recommends that you always configure the flood rate to be less than the line speed.
By default the following peak flood rate values are used for limiting the rate at which traffic is flooded on
a switch port:
To change the peak flood rate for an entire slot, enter interfaces followed by the slot number, flood rate,
and the flood rate in megabits. For example, to configure the peak flood rate on slot 2 as 49 megabits,
enter:
-> interfaces 2 flood rate 49
To change the peak flood rate for a single port, enter interfaces followed by the slot number, a slash (/),
the port number, flood rate, and the flood rate in megabits. For example, to configure the peak flood rate
on port 3 on slot 2 as 49 megabits, enter:
-> interfaces 2/3 flood rate 49
To change the peak flood rate for a range of ports, enter interfaces followed by the slot number, a slash (/
), the first port number, a hyphen (-), the last port number, flood rate, and the flood rate in megabits. For
example, to configure the peak flood rate on ports 1 through 3 on slot 2 as 49 megabits, enter:
-> interfaces 2/1-3 flood rate 42
To specify the type of traffic eligible for rate limiting, see “Flood Only Rate Limiting” on page 1-12 and
“Multicast Flood Rate Limiting” on page 1-12 for more information.
parameter default
Mbps (10 Ethernet) 4
Mbps (100 Fast Ethernet) 49
Mbps (Gigabit Ethernet) 496
Mbps (10 Gigabit Ethernet) 997
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