Cisco Systems 78-11741-02 manual Dhcp Database Agent Configuration Example, IPC-77

Configuring DHCP

Configuration Examples

DHCP Database Agent Configuration Example

The following example stores bindings on host 172.16.4.253. The file transfer protocol is FTP. The server should wait 2 minutes (120 seconds) before writing database changes.

ip dhcp database ftp://user:password@172.16.4.253/router-dhcp write-delay 120

DHCP Address Pool Configuration Example

In the following example, three DHCP address pools are created: one in network 172.16.0.0, one in subnetwork 172.16.1.0, and one in subnetwork 172.16.2.0. Attributes from network 172.16.0.0—such as the domain name, DNS server, NetBIOS name server, and NetBIOS node type—are inherited in subnetworks 172.16.1.0 and 172.16.2.0. In each pool, clients are granted 30-day leases and all addresses in each subnetwork, except the excluded addresses, are available to the DHCP Server for assigning to clients. Table 5 lists the IP addresses for the devices in three DHCP address pools.

Table 5	DHCP Address Pool Configuration Example
Pool 0 (Network 172.16.0.0)			Pool 1 (Subnetwork 172.16.1.0)		Pool 2 (Subnetwork 172.16.2.0)
Device		IP Address	Device	IP Address	Device	IP Address
Default routers		–	Default routers	172.16.1.100	Default routers	172.16.2.100
				172.16.1.101		172.16.2.101
DNS Server		172.16.1.102	—	—	—	—
		172.16.2.102
NetBIOS name server		172.16.1.103	—	—	—	—
		172.16.2.103
NetBIOS node type		h-node	—	—	—	—

ip dhcp database ftp://user:password@172.16.4.253/router-dhcp write-delay 120 ip dhcp excluded-address 172.16.1.100 172.16.1.103

ip dhcp excluded-address 172.16.2.100 172.16.2.103

!

ip dhcp pool 0 network 172.16.0.0 /16 domain-name cisco.com

dns-server 172.16.1.102 172.16.2.102 netbios-name-server 172.16.1.103 172.16.2.103 netbios-node-type h-node

!

ip dhcp pool 1 network 172.16.1.0 /24

default-router 172.16.1.100 172.16.1.101 lease 30

!

ip dhcp pool 2 network 172.16.2.0 /24

default-router 172.16.2.100 172.16.2.101 lease 30

Cisco IOS IP Configuration Guide

IPC-77