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Foundry NetIron M2404C and M2404F Metro Access Switches
Troubleshooting and Monitoring (Rev. 03)
Protection from Multicast and Layer-2 Unknown Packet Storms © 2008 Foundry Networks, Inc.
Page 12 of 55
Protection from Multicast and Layer-2
Unknown Packet Storms
The user can use the packet storm protection feature to set limits on the reception rate of broadcast
and multicast packets. The Layer-2 Unknown packet protection feature allows the user to protect
the device against massive reception of Layer-2 unknown packets that can interrupt the device and
network operation.
Table 5
lists the commands for protecting the device from multicast and layer 2 unknown packet-
storms.
Table 5: Storm-Protection Commands
Command
Description
multicast-limit
Enables limiting the rate of the multicast traffic.
unknown-limit
Sets a limit to the rate of the Layer-2 unknown packets on the
configured interface.
Storm-Protection Default Configuration
Table 6
shows the default values for protecting the device from multicast, broadcast and unknown
packet storms.
Table 6: Storm-Protection Default Configuration
Parameter
Default Value
multicast rate limit
The multicast rate limit is enabled if the broadcast rate limit is
set. Otherwise it is disabled.
unknown rate limit
Included in the broadcast rate limit.
Configuring Storm-Protection
Setting a Multicast Rate Limit
The
multicast-limit
command, in Interface Configuration mode, enables limiting the rate of the
multicast traffic. The
no
form of the command disables the rate limit of the multicast packets.
To view the multicast rate limit status, use the
show interface
command in Privileged (Enable)
mode, with the interface argument specified.
Command Syntax
device-name
(config-if UU/SS/PP)#
multicast-limit
{<
limit
>
|
unlimited
}
device-name
(config-if UU/SS/PP)#
no
multicast-limit