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 13 of 55
Argument Description
limit
The multicast packets’ limit is in thousand packets per second. The valid
range is 0-262143.
unlimited
Returns unknown limit to the default value, unlimited.
Example
device-name
(config-if 1/1/1)#
multicast-limit 1000
device-name
(config-if 1/1/1)#
end
device-name
#
show interface 1/1/1
Name =
Type = 100BaseTX (L3)
EnableState = enable
Link = down
Duplex speed mode = autonegotiate
Duplex speed status = unknown
Flow control mode = disable
Flow control status = disable
Backpressure = disable
Broadcast limit = unlimited
Multicast limit = 1000
Unknown limit = unlimited
Default VLAN = 1
Port Crossover = AUTO MDI/MDIX
Super VLAN Port = No
Learning new address = Enabled
Max Packet Size (MRU)= 1528
Setting a Rate Limit to Layer 2 Unknown Packets
The
unknown-limit
command, in Interface Configuration mode, sets a limit to the rate of the
Layer-2 unknown packets. The
no
form of the command disables the rate limit of the Layer-2
unknown packets.
This feature allows the user to protect the device against massive reception of layer 2 unknown
packets that can interrupt the device and network operation.
To view the status of the Layer-2 unknown packets rate limit, use the
show interface
command in
Privileged (Enable) mode, with the interface argument specified.
By default, the rate of the Layer-2 unknown packets is unlimited.
Command Syntax
device-name
(config-if
UU/SS/PP
)#
unknown-limit
{<
limit
> |
unlimited
}
device-name
(config-if
UU/SS/PP
)#
no unknown-limit
Argument Description
limit
The unknown packets’ limit is in thousand packets per second. The valid
range is 0-262143.
unlimited
Returns unknown limit to the default value, unlimited.
Example
device-name
(config-if 1/1/1)#
unknown-limit 1000