Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring Interfaces (Rev. 03)
Fast Ethernet and Giga Ethernet Port
© 2008 Foundry Networks, Inc.
Page 11 of 57
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
packets with unknown destination Layer-2 (MAC) address on the configured interface. The
no
form of the command disables the rate limit on 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 proper device and network operation.
To view the unknown rate limit status, use the
show interface
command in Privileged (Enable)
mode, with the
interface
argument specified. For more information see
Displaying the Interface
Configuration Settings.
By default, the rate of packets destined for unknown Layer-2 addresses 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.
Setting the Packet Size Limit
The
packet-size-limit
command, in Interface Configuration mode, sets the maximum packet size
allowed on the configured interface.
The default maximum packet size is 1528 bytes.
To display the current packet-size limit on an interface, use the
show
command in Interface
Configuration mode, or the
show interface
command in Privileged (Enable) mode.
NOTE
VLAN tags are not considered when the maximum packet size is set.
For example, if the user sets the maximum packet size to 4000, the device accepts
untagged packets up to 4004.
Command Syntax
device-name
(config-if
UU/SS/PP
)#
packet-size-limit
{<
limit
> |
default
}
Argument Description
limit
The maximum allowed packet size on the interface, in bytes. The valid range is 512
to 9216.
default
By default, the packet size is 1528.
Example
device-name
(config-if 1/1/1)#
packet-size-limit 512
device-name
(config-if 1/1/1)#
show
...