21
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, DHCP,
or PPP address negotiation. 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, PPP address negotiation, 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
IP address from other interfaces. This is called IP unnumbered, and the interface borrowing the IP address
is called IP unnumbered interface.
You can use IP unnumbered to save IP addresses either when available IP addresses are inadequate or
when an interface is brought up only for occasional use.
Summary of Contents for MSR 2600 Series
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