Without subnetting—65,534 hosts (2
•
address, which has an all-one host ID, and the network address, which has an all-zero host ID.)
With subnetting—Using the first 9 bits of the host-id for subnetting provides 512 (2
•
However, only 7 bits remain available for the host ID. This allows 126 (2
a total of 64,512 hosts (512 × 126).
Assigning an IP address to an interface
You can assign an interface one primary address and multiple secondary addresses.
Generally, you only need to assign the primary address to an interface. In some cases, you need to
assign secondary IP addresses to the interface. For example, if the interface connects to two subnets, to
enable the device to communicate with all hosts on the LAN, you need to assign a primary IP address
and a secondary IP address to the interface.
Configuration guidelines
Follow these guidelines when you assign an IP address to an interface:
Each interface has only one primary IP address. A newly configured primary IP address overwrites
•
the previous one.
You cannot assign secondary IP addresses to an interface that obtains an IP address through
•
BOOTP or DHCP.
•
The primary and secondary IP addresses you assign to the interface can be located on the same
network segment, but different interfaces on your device must reside on different network segments.
You can manually assign an IP address to an interface, or configure the interface to obtain an IP
•
address through BOOTP or DHCP. If you change the way an interface obtains an IP address, the
new IP address overwrites the previous one.
The switch supports a 31-bit subnet mask (the mask 255.255.255.254) for saving IP addresses in
•
the point-to-point communication.
Configuration procedure
To assign an IP address to an interface:
Step
1.
Enter system view.
2.
Enter interface view.
3.
Assign an IP address to
the interface.
Configuration example
Network requirements
As shown in
172.16.1.0/24 and 172.16.2.0/24.
Command
system-view
interface interface-type
interface-number
ip address ip-address { mask-length
| mask } [ sub ]
Figure
14, a port in VLAN 1 on a switch is connected to a LAN comprising two segments:
– 2). (The two deducted addresses are the broadcast
16
Remarks
N/A
N/A
By default, no IP address is assigned to
any interface.
25
9
) subnets.
7
– 2) hosts in each subnet,