Multicast Flood Rate Limiting; Configuring The Peak Flood Rate Value - Alcatel-Lucent OmniSwitch 6800 Series Network Configuration Manual

Configuring Ethernet Ports

Multicast Flood Rate Limiting

The interfaces flood multicast
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
Multicast Switching (IPMS) and non-IPMS multicast traffic.

Configuring the Peak Flood Rate Value

The interfaces flood rate
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, 6850, and 9000 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 accu-
racy/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.
OmniSwitch 6800/6850/9000 Network Configuration Guide
command is used to enable or disable flood rate limiting for multicast traf-
command is used to configure the peak flood rate value on a specific port, a
Setting Ethernet Parameters for All Port Types
interfaces flood multicast
March 2008
command will limit IP
page 37-11