Lexmark IBM 9077 - Manual (Page 112)

Installation and Configuration 94
Internet address
The Internet address is the 32-bit IP address for the specified logical
interface. The address is in standard dotted-decimal (octet) notation:
xxx.xxx.xxx.xxx.
Netmask
Netmask is the 32-bit address for the logical IP network on the physical
network to which the specific SP Switch Router or media card physical
interface is attached. The netmask is entered in standard dotted-decimal
(octet) notation. If no destination/broadcast address is supplied, a
netmask is required.
Broadcast or destination address
The broadcast or destination address is the 32-bit address for this
network. Enter the broadcast or destination address in standard dotted-
decimal (octet) notation. When a broadcast IP address is assigned to a
logical interface, the netmask value is ignored. A dash (-) can be entered
in the netmask column, or it can be left blank.
The connection of the SP Switch Router Adapter card to the SP system is
point-to-multipoint.
When you assign an IP address to a logical interface on a point-to-point
media such as HIPPI or ATM, the destination address is entered in the
broadcast address field.
Note that any entry in the broadcast address field for HIPPI or ATM makes
it a point-to-point connection to that address. If you remove the broadcast
address, you create a nonbroadcast, multiaccess (NBMA) interface.
Argument field
This field is optional for SP Switch Router Adapter cards. The argument
field specifies a Maximum Transmission Unit (MTU) value different from
the coded default value of 65520. When the command
grifconfig runs, it
passes the arguments to the ifconfig command that it spawns.
Default MTU values
Default MTUs for SP Switch Router media are:
• SP Switch Router Adapter: 65520 bytes
• HIPPI: 65280 bytes
• FDDI: 4352 bytes
• ATM OC-3c: 9180 bytes
• ATM OC-12c: 9180 bytes
• 10/100Base-T: 1500 bytes