Configure Ip Address - 3Com 7700 Configuration Manual

48 C 4: N
HAPTER ETWORK

Configure IP Address

P O
ROTOCOL PERATION
With the rapid development of the Internet, IP addresses are depleting very fast.
The traditional IP address allocation method uses up IP addresses with little
efficiency. The concept of mask and subnet was proposed to make full use of the
available IP addresses.
A mask is a 32-bit number corresponding to an IP address. The number consists of
1s and 0s. Principally, these 1s and 0s can be combined randomly. However, the
first consecutive bits are set to 1s when designing the mask. The mask is dividied
into two parts: subnet address and host address. The 1 bits and the mask indicate
the subnet address. The other bits indicate the host address. The mask for Class A
addresses is 255.0.0.0, for Class B addresses is 255.255.0.0, and for Class C
addresses is 255.255.255.0.
The mask can be used to divide a Class A network containing more than
16,000,000 hosts or a Class B network containing more than 60,000 hosts into
multiple small networks. Each small network is called a subnet. For example, for
the Class A network address 10.110.0.0, the mask 255.255.224.0 can be used to
divide the network into 8 subnets: (10.110.0.0, 10.110.32.0, 10.110.64.0, and so
on). Each subnet can contain more than 8000 hosts.
Configure the host name and the corresponding IP address
■
Configure IP address for a VLAN interface
■
Display and debug IP Address
■
Configure IP Address and HostName for a Host
Perform the following configuration in System view.
Table 1 Configure the Host Name and the Corresponding IP Address
Operation
Configure the host name and
the corresponding IP address
Delete the host name and the
corresponding IP address
By default, there is no host name associated to any host IP address.
Configure IP Address of the VLAN Interface
You can configure an IP address for every VLAN interface of the Ethernet Switch.
Perform the following configuration in VLAN interface view.
Table 2 Configure IP Address for a VLAN Interface
Operation
Configure IP address for a
VLAN interface
Delete the IP address of a
VLAN interface
The network ID of an IP address is identified by the mask. For example, the IP
address of a VLAN interface is 129.9.30.42 and the mask is 255.255.0.0. After
performing the "AND" operation for the IP address and the mask, you can assign
that device to the network segment 129.9.0.0.
Command
ip host hostname ip-address
undo ip host hostname [ ip-address ]
Command
ip address ip-address net-mask [ sub ]
undo ip address [ ip-address net-mask [ sub ] ]