Filter
Top Products
Command Line Interface
4-244
4
Default Setting
DHCP
Command Mode
Interface Configuration (VLAN)
Command Usage
• If this router is directly connected to end node devices (or connected to end
nodes via shared media) that will be assigned to a specific subnet, then you
must create a router interface for each VLAN that will support routing. The
router interface consists of an IP address and subnet mask. This interface
address defines both the network number to which the router interface is
attached and the router’s host number on that network. In other words, a
router interface address defines the network and subnetwork numbers of the
segment that is connected to that interface, and allows you to send IP packets
to or from the router.
• Before you configure any network interfaces on this router, you should first
create a VLAN for each unique user group, or for each network application
and its associated users. Then assign the ports associated with each of these
VLANs.
• You must assign an IP address to this device to gain management access
over the network or to connect the router to existing IP subnets. You can
manually configure a specific IP address, or direct the device to obtain an
address from a BOOTP or DHCP server. Valid IP addresses consist of four
numbers, 0 to 255, separated by periods. Anything outside this format will not
be accepted by the configuration program.
• An interface can have only one primary IP address, but can have many
secondary IP addresses. In other words, you will need to specify secondary
addresses if more than one IP subnet can be accessed via this interface.
• If you select the bootp or dhcp option, IP is enabled but will not function until
a BOOTP or DHCP reply has been received. Requests will be broadcast
periodically by this device in an effort to learn its IP address. (BOOTP and
DHCP values can include the IP address, default gateway, and subnet mask).
• You can start broadcasting BOOTP or DHCP requests by entering an ip dhcp
restart client command, or by rebooting the router.
Notes: 1. Each VLAN group can be assigned its own IP interface address.
Therefore, if routing is enabled, you can manage the router via any of
these IP addresses.
2. Before you can change the primary IP address on an interface, you
must first clear the current address with the no form of this command.
Example
In the following example, the device is assigned an address in VLAN 1.
Console(config)#interface vlan 1
Console(config-if)#ip address 192.168.1.5 255.255.255.0
Console(config-if)#