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196 CHAPTER 21: DHCP CONFIGURATION GUIDE
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Configuration Procedure # Enable DHCP.
[SwitchA] dhcp enable
# Exclude the IP addresses of the DNS server, WINS server, and gateways from
dynamic assignment.
[SwitchA] dhcp server forbidden-ip 10.1.1.2
[SwitchA] dhcp server forbidden-ip 10.1.1.4
[SwitchA] dhcp server forbidden-ip 10.1.1.126
[SwitchA] dhcp server forbidden-ip 10.1.1.254
# Enable unauthorized DHCP server detection.
[SwitchA] dhcp server detect
# Configure the address range, domain name suffix and DNS server address in
DHCP address pool 0.
[SwitchA] dhcp server ip-pool 0
[SwitchA-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0
[SwitchA-dhcp-pool-0] domain-name aabbcc.com
[SwitchA-dhcp-pool-0] dns-list 10.1.1.2
[SwitchA-dhcp-pool-0] quit
# Configure the address range, gateway address, and lease duration in DHCP
address pool 1.
[SwitchA] dhcp server ip-pool 1
[SwitchA-dhcp-pool-1] network 10.1.1.0 mask 255.255.255.128
[SwitchA-dhcp-pool-1] gateway-list 10.1.1.126
[SwitchA-dhcp-pool-1] expired day 10 hour 12
[SwitchA-dhcp-pool-1] quit
# Configure the address range, lease duration, DNS server address and gateway
address in DHCP address pool 2.
[SwitchA] dhcp server ip-pool 2
[SwitchA-dhcp-pool-2] network 10.1.1.128 mask 255.255.255.128
[SwitchA-dhcp-pool-2] expired day 5
[SwitchA-dhcp-pool-2] nbns-list 10.1.1.4
[SwitchA-dhcp-pool-2] gateway-list 10.1.1.254
[SwitchA-dhcp-pool-2] quit
With the unauthorized DHCP server detection enabled, Switch A will log
information about all DHCP servers, including authorized ones. The administrator
needs to find unauthorized DHCP servers from the system log information. If
Switch A detects an unauthorized DHCP server, the following log information is
recorded.
Product series Software version Hardware version
Switch 5500 Release V03.02.04 All versions
Switch 5500G Release V03.02.04 All versions