Configuring Ip Addresses; Assigning An Ip Address To An Interface - H3C S5810 Series Operation Manual

In the absence of subnetting, some special addresses such as the addresses with the net ID of all zeros
and the addresses with the host ID of all ones, are not assignable to hosts. The same is true for
subnetting. When designing your network, you should note that subnetting is somewhat a tradeoff
between subnets and accommodated hosts. For example, a Class B network can accommodate 65,534
16
(2 – 2. Of the two deducted Class B addresses, one with an all-one host ID is the broadcast address
and the other with an all-zero host ID is the network address) hosts before being subnetted. After you
break it down into 512 (2
bits for the host ID and thus have only 126 (2
is thus 64,512 (512 × 126), 1022 less after the network is subnetted.
Class A, B, and C networks, before being subnetted, use these default masks (also called natural
masks): 255.0.0.0, 255.255.0.0, and 255.255.255.0 respectively.

Configuring IP Addresses

An interface can communicate with other hosts after it obtains an IP address. Besides directly assigning
an IP address to an interface, you may configure the interface to obtain one through BOOTP, DHCP. If
you change the way an interface obtains an IP address, from manual assignment to BOOTP for
example, the IP address obtained from BOOTP will overwrite the old one manually assigned.
This chapter only covers how to assign an IP address manually. For the other three approaches, refer to
DHCP Configuration in the IP Services Volume .
This section includes:

Assigning an IP Address to an Interface

IP Addressing Configuration Example
Assigning an IP Address to an Interface
You may assign an interface multiple IP addresses, one primary and multiple secondaries, to connect
multiple logical subnets on the same physical subnet.
Follow these steps to assign an IP address to an interface:
To do...
Enter system view
Enter interface view
Assign an IP address to
the interface
9
) subnets by using the first 9 bits of the host ID for the subnet, you have only 7
7
– 2) hosts in each subnet. The maximum number of hosts
Use the command...
system-view
interface interface-type
interface-number
ip address ip-address { mask |
mask-length } [ sub ]
1-3
Remarks
––
––
Required
No IP address is assigned by
default.