Cisco 520-T1 Software Guide - Page 58
VLANs, Configuration Tasks, Con DHCP, Example
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Configure DHCP Chapter 5 Configuring a LAN with DHCP and VLANs 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: Step 1 Command ip domain name name Example: Router(config)# ip domain name smallbiz.com Router(config)# Purpose Identifies the default domain that the router uses to complete unqualified hostnames (names without a dotted-decimal domain name). Step 2 ip name-server server-address1 [server-address2...server-address6] Example: Specifies the address of one or more Domain Name System (DNS) servers to use for name and address resolution. Router(config)# ip name-server 192.168.11.12 Router(config)# Step 3 ip dhcp excluded-address low-address [high-address] Example: Router(config)# ip dhcp excluded-address 192.168.9.0 Specifies IP addresses that the DHCP server should not assign to DHCP clients. In this example, we are excluding the router address. Cisco Secure Router 520 Series Software Configuration Guide 5-2 OL-14210-01