Assigning an ip address to an interface, Configuration guidelines, Configuration procedure – H3C Technologies H3C S5560 Series Switches User Manual
Page 35: Configuring ip unnumbered
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For example, a Class B network without subnetting can accommodate 1022 more hosts than the same
network subnetted into 512 subnets.
•
Without subnetting—65534 hosts (2
16
– 2). (The two deducted addresses are the broadcast
address, which has an all-one host ID, and the network address, which has an all-zero host ID.)
•
With subnetting—Using the first nine bits of the host-id for subnetting provides 512 (2
9
) subnets.
However, only seven bits remain available for the host ID. This allows 126 (2
7
– 2) hosts in each
subnet, a total of 64512 hosts (512 × 126).
Assigning an IP address to an interface
An interface must have an IP address to communicate with other hosts. You can either 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 will overwrite the previous
address.
An interface can have one primary address and multiple secondary addresses.
Typically, you need to configure a primary IP address for an interface. If the interface connects to multiple
subnets, configure primary and secondary IP addresses on the interface so the subnets can communicate
with each other through the interface.
Configuration guidelines
Follow these guidelines when you assign an IP address to an interface:
•
An interface can have 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, DHCP, or IP unnumbered.
•
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.
Configuration procedure
To assign an IP address to an interface:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface interface-type
interface-number
N/A
3.
Assign an IP address to the
interface.
ip address ip-address { mask |
mask-length } [ sub ]
By default, no IP address is
assigned to the interface.
Configuring IP unnumbered
Typically, you assign an IP address to an interface either manually or through DHCP. If the IP addresses
are not enough, or the interface is used only occasionally, you can configure an interface to borrow an