3Com 10014298 Displaying and Debugging an IP Address, Example Configuring an IP Address, Sub

Configuring IP Address 69

Perform the following configuration in VLAN interface view.

Table 63 Configure IP Address for a VLAN Interface

Operation	Command
Configure IP address for a VLAN interface	ip address ip-address net-mask [
	sub ]
Delete the IP address of a VLAN interface	[ undo ] ip address [ ip-address {
	net-mask mask-length } [ sub ] ]

The network ID of an IP address is identified by the mask. For example, the IP address of a VLAN interface is 129.9.30.42 and the mask is 255.255.0.0. After performing the AND operation for the IP address and the mask, you can assign that device to the network segment 129.9.0.0.

Generally, it is sufficient to configure one IP address for an interface. However, you can also configure more than one IP address for an interface so that it can be connected to several subnets. Among these IP addresses, one is the primary IP address and all others are secondary.

By default, the IP address of a VLAN interface is null.

Displaying and Debugging an IP Address

Use the display command in all views to display the IP address configuration on interfaces, and to verify configuration.

Table 64 Display and Debug IP Address

Operation	Command
Display all hosts on the network and the	display ip hosts
corresponding IP addresses
Display the configurations of each interface	display ip interface vlan-interface vlan-id

Example: Configuring an IP Address

Configure the IP address as 129.2.2.1 and subnet mask as 255.255.255.0 for the VLAN interface 1 of the Ethernet Switch.