3Com 10014299 manual Configure IP Address Configure IP Address for an Interface, Mask-length

320CHAPTER 20: CONFIGURING IP ADDRESS

Figure 119 Relation between host name, IP address and physical address

Configure IP Address Configure IP Address for an Interface

Use a mask to label the network ID contained in an IP address. Example: the IP address of an Ethernet interface of a router is 129.9.30.42, and the mask is 255.255.0.0. To obtain the network ID a logical and operation is performed between the IP address and the mask. Thus the above router’s Ethernet interface will be 129.0.0.0

Each interface of a router can have several IP addresses, among which one is the master IP address and the others are slave IP addresses. Any two IP addresses of a router cannot be in the same network segment.

Perform the following configuration in interface view.

1Configure master IP address of an interface

For each interface of a router, multiple IP addresses can be configured, among which one is the master IP address and the rest are slave IP addresses. Two IP addresses of one router can never be configured within the same network segment.

Table 352 Configure master IP address of an interface

Operation	Command
Configure master IP address of an interface	ip address ip-address { mask
	mask-length }
Delete IP address of an interface	undo ip address ip-address{ mask
	mask-length }

By default, the interface has no master IP address.