Cisco Systems 520 series manual Configure Dhcp, VLANs, Dotted-decimal domain name

Chapter 5 Configuring a LAN with DHCP and VLANs

Configure DHCP

Note Whenever you change server properties, you must reload the server with the configuration data from the Network Registrar database.

VLANs

The Cisco Secure Router 520 Series routers support four Fast Ethernet ports on which you can configure VLANs.

VLANs enable networks to be segmented and formed into logical groups of users, regardless of the user’s physical location or LAN connection.

Configuration Tasks

Perform the following tasks to configure this network scenario:

•Configure DHCP

•Configure VLANs

Note The procedures in this chapter assume you have already configured basic router features as well as PPPoE or PPPoA with NAT. If you have not performed these configurations tasks, see Chapter 1, “Basic Router Configuration,” Chapter 3, “Configuring PPP over Ethernet with NAT,” and Chapter 4, “Configuring PPP over ATM with NAT” as appropriate for your router.

Configure DHCP

Perform these steps to configure your router for DHCP operation, beginning in global configuration mode:

		Command	Purpose
	Step 1
		ip domain name name	Identifies the default domain that the router uses to
			complete unqualified hostnames (names without a
		Example:	dotted-decimal domain name).
		Router(config)# ip domain name smallbiz.com
		Router(config)#
	Step 2
		ip name-server server-address1	Specifies the address of one or more Domain
		[server-address2...server-address6]	Name System (DNS) servers to use for name and
			address resolution.
		Example:
		Router(config)# ip name-server 192.168.11.12
		Router(config)#
	Step 3
		ip dhcp excluded-address low-address	Specifies IP addresses that the DHCP server
		[high-address]	should not assign to DHCP clients. In this
			example, we are excluding the router address.
		Example:
		Router(config)# ip dhcp excluded-address
		192.168.9.0
	Cisco Secure Router 520 Series Software Configuration Guide
5-2			OL-14210-01