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Configuring Ethernet Ports Setting Ethernet Parameters for All Port Types

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 1-11

Multicast Flood Rate Limiting

The interfaces flood multicast command is used to enable or disable flood rate limiting for multicast traf-

fic on a single port, a range of ports, or all ports on a switch (slot). When multicast flood rate limiting is

enabled, the peak flood rate value for a port is applied to both multicast and flooded traffic.

By default, multicast flood rate limiting is disabled for a port. To apply the peak flood rate value to multi-

cast traffic on a slot, enter interfaces followed by the slot number and flood multicast. For example, to

enable the maximum flood rate for multicast traffic on slot 2, enter:

-> interfaces 2 flood multicast

To apply the peak flood rate value to multicast traffic on a single port, enter interfaces followed by the

slot number, a slash (/), the port number, and flood multicast. For example, to enable the maximum flood

rate for multicast traffic on port 3 on slot 2, enter:

-> interfaces 2/3 flood multicast

To apply the peak flood rate value to multicast traffic on a range of ports, enter interfaces followed by the

slot number, a slash (/), the first port number, a hyphen (-), the last port number, and flood multicast. For

example, to enable the maximum flood rate for multicast traffic on ports 3 through 4 on slot 2, enter:

-> interfaces 2/3-4 flood multicast

As an option, you can document the interface type by entering ethernet, fastethernet, or gigaethernet

before the slot number. For example, to enable the maximum flood rate for multicast traffic on slot 2 and

document the slot as Gigabit Ethernet, enter:

-> interfaces gigaethernet 2 flood multicast

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 OmniSwitch 6800 and 6850 switches the flood rate can only be accurately configured for 512-byte

packets. The flood rate cannot be accurately set for smaller or larger sized packets. The accuracy/reso-

lution 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 recom-

mends that you always configure the flood rate to be less than the line speed.

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