IBM TotalStorage DS300 Best Practices Manual page 618

Optionally, the netmask may be set at the same time by adding the ip_mask
value, which defines the number of bits that make up the network. Alternatively,
the netmask can be defined by adding the netmask command to the same line.
This command may be combined with the broadcast and netmask commands on
a single line. If they are not given, default values will be deduced from the
address supplied.
If DHCP is enabled, this command changes the stored value which will be used if
DHCP is disabled, but otherwise does not change the actual value of the
interface. If DHCP is disabled, this command resets the interface.
mtu mtu
Specify the size of the Maximum Transmission Unit (MTU) for the interface. Press
Tab to see a list of acceptable size values.
netmask netmask
Set the interface's netmask to be the value supplied.
This command may be combined with the ip and netmask commands on a single
line. The ip command describes the default value for this option if just the IP
number is changed.
If DHCP is enabled, this command changes the stored value which will be used if
DHCP is disabled, but otherwise does not change the actual value of the
interface. If DHCP is disabled, this command resets the interface.
rename name
Specify a new name for the interface.
speed 10 | 100 | auto
For devices that can auto-negotiate their speed, clamp their speed to a specified
value.
A value of auto will re-establish auto-negotiation if the device is capable of doing
that. The full option is not valid with auto.
statistics
Display these statistics for the open interface:
Number of collisions
Number of transmitted packets with breakdown of failures
Number of received packets with breakdown of failures
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IBM TotalStorage DS300 and DS400 Best Practices Guide