IBM SC41-5420-04 manual Type of Service TOS, X25LINE, Loopback None

		Work with TCP/IP Interfaces
				System: SYSNAM03
Type options, press Enter.
1=Add 2=Change		4=Remove 5=Display 9=Start		10=End
	Internet	Subnet	Line	Line
Opt	Address	Mask	Description	Type
__	_______________
__	9.4.73.65	255.255.255.192	X25LINE	*X25
__	127.0.0.1	255.0.0.0	*LOOPBACK	*NONE
__	223.1.1.17	255.255.255.0	X25LINE	*X25

F3=Exit	F5=Refresh	F6=Print list	F11=Display interface status
F12=Cancel	F17=Top	F18=Bottom

Figure 53. Work with TCP/IP Interfaces Display, Multihoming

Type of Service (TOS)

Type of Service (TOS) is a parameter defined to indicate a quality of the service desired by an application program. It is specified within a single octet of the IP datagram header, and it is used to select Internet service. It denotes how the Internet hosts and routers should make trade-offs between throughput, delay, reliability, and cost.

TOS is used to identify and select the actual transmission characteristics for a particular network, the interface, and the route to be used when routing an Internet datagram. The TOS values are mapped into the actual TOS value of the particular network a datagram is going through. All of the values are mutually exclusive.

The TOS values are defined through the Add TCP/IP Interface (ADDTCPIFC) and Add TCP/IP Route (ADDTCPRTE) commands. The possible selections are as follows:

*NORMAL

Normal service is used for delivery of datagrams.

*MINDELAY

Minimize delay means that prompt delivery is important for datagrams with this indication.

*MAXTHRPUT

Maximize throughput means that high data rate is important for datagrams with this indication.

*MAXRLB

Maximize reliability means that a higher level of effort to ensure delivery is important for datagrams with this indication.

*MINCOST

Minimize monetary cost means that lower cost is important for datagrams with this indication.

60OS/400 TCP/IP Configuration and Reference V5R1