HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 27

Configuring IP addressing, Overview, IP address classes

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Configuring IP addressing This chapter describes IP addressing basic and manual IP address assignment for interfaces. Dynamic IP address assignment (BOOTP and DHCP) are beyond the scope of this chapter. Overview This section describes the IP addressing basics. IP addressing uses a 32-bit address to identify each host on a network. To make addresses easier to read, they are written in dotted decimal notation, each address being four octets in length. For example, address 00001000000000010000000100000001 in binary is written as 10.1.1.1. IP address classes Each IP address breaks down into two parts: • Net ID-Identifies a network. The first several bits of a net ID, known as the class field or class bits, identify the class of the IP address. • Host ID-Identifies a host on a network. IP addresses are divided into five classes, shown in Figure 11. The shaded areas represent the address class. The first three classes are widely used. Figure 11 IP address classes Table 1 IP address classes and ranges Class A B C Address range 0.0.0.0 to 127.255.255.255 128.0.0.0 to 191.255.255.255 192.0.0.0 to 223.255.255.255 Remarks The IP address 0.0.0.0 is used by a host at startup for temporary communication. This address is never a valid destination address. Addresses starting with 127 are reserved for loopback test. Packets destined to these addresses are processed locally as input packets rather than sent to the link. N/A N/A 19

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19
Configuring IP addressing
This chapter describes IP addressing basic and manual IP address assignment for interfaces. Dynamic IP
address assignment (BOOTP and DHCP) are beyond the scope of this chapter.
Overview
This section describes the IP addressing basics.
IP addressing uses a 32-bit address to identify each host on a network. To make addresses easier to read,
they are written in dotted decimal notation, each address being four octets in length. For example,
address 00001000000000010000000100000001 in binary is written as 10.1.1.1.
IP address classes
Each IP address breaks down into two parts:
•
Net ID
—Identifies a network. The first several bits of a net ID, known as the class field or class bits,
identify the class of the IP address.
•
Host ID
—Identifies a host on a network.
IP addresses are divided into five classes, shown in
Figure 11
. The shaded areas represent the address
class. The first three classes are widely used.
Figure 11
IP address classes
Table 1
IP address classes and ranges
Class
Address range
Remarks
A
0.0.0.0 to 127.255.255.255
The IP address 0.0.0.0 is used by a host at startup for
temporary communication. This address is never a valid
destination address.
Addresses starting with 127 are reserved for loopback test.
Packets destined to these addresses are processed locally as
input packets rather than sent to the link.
B
128.0.0.0 to
191.255.255.255
N/A
C
192.0.0.0 to
223.255.255.255
N/A