C H A P T E R 5
Configuring a LAN with DHCP and VLANs
The Cisco 1800 series integrated services fixed-configuration routers support clients on both physical LANs and virtual LANs (VLANs). The routers can use the Dynamic Host Configuration Protocol (DHCP) to enable automatic assignment of IP configurations for nodes on these networks.
Figure 5-1shows a typical deployment scenario with two physical LANs connected by the router and two VLANs.
Figure 5-1 Physical and Virtual LANs with DHCP Configured on the Cisco Router
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Fast Ethernet LAN (with multiple networked devices)
Router and DHCP server—Cisco 1800 series integrated services router—connected to the Internet
VLAN 1
VLAN 2
DHCP
DHCP, which is described in RFC 2131, uses a client/server model for address allocation. As an administrator, you can configure your Cisco 1800 integrated services fixed-configuration router to act as a DHCP server, providing IP address assignment and other TCP/IP-oriented configuration information to your workstations. DHCP frees you from having to manually assign an IP address to each client.
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
