ii
Network requirements ··········································································································································· 23
Configuration procedure ······································································································································ 23
Verifying the configuration ··································································································································· 24
DHCP overview ·························································································································································· 25
DHCP address allocation ·············································································································································· 25
Allocation mechanisms ········································································································································· 25
IP address allocation process ······························································································································· 26
IP address lease extension···································································································································· 26
DHCP message format ··················································································································································· 27
DHCP options ································································································································································· 28
Common DHCP options ········································································································································ 28
Custom DHCP options ··········································································································································· 28
Protocols and standards ················································································································································ 30
Configuring the DHCP server ···································································································································· 32
Overview ········································································································································································· 32
DHCP address pool ··············································································································································· 32
IP address allocation sequence ···························································································································· 34
DHCP server configuration task list ······························································································································ 34
Configuring an address pool on the DHCP server ····································································································· 35
Configuration task list ··········································································································································· 35
Creating a DHCP address pool ··························································································································· 35
Specifying IP address ranges for a DHCP address pool ·················································································· 35
Specifying gateways for the client······················································································································· 38
Specifying a domain name suffix for the client ·································································································· 39
Specifying DNS servers for the client ·················································································································· 39
Specifying WINS servers and NetBIOS node type for the client ····································································· 39
Specifying BIMS server information for the client ······························································································ 40
Specifying the TFTP server and boot file name for the client ············································································ 40
Specifying a server for the DHCP client ·············································································································· 41
Configuring Option 184 parameters for the client ···························································································· 41
Customizing DHCP options ·································································································································· 42
Enabling DHCP ······························································································································································ 43
Enabling the DHCP server on an interface ·················································································································· 43
Applying an address pool on an interface ················································································································· 44
Configuring IP address conflict detection ···················································································································· 44
Enabling handling of Option 82 ·································································································································· 44
Configuring DHCP server compatibility ······················································································································· 45
Configuring the DHCP server to broadcast all responses ················································································· 45
Configure the DHCP server to ignore BOOTP requests ···················································································· 45
Configuring the DHCP server to send BOOTP responses in RFC 1048 format·············································· 46
Setting the DSCP value for DHCP packets sent by the DHCP server ········································································ 46
Displaying and maintaining the DHCP server ············································································································ 46
DHCP server configuration examples ·························································································································· 47
Static IP address assignment configuration example························································································· 47
Dynamic IP address assignment configuration example ··················································································· 49
DHCP user class configuration example ············································································································· 50
Primary and secondary subnets configuration example ··················································································· 51
DHCP option customization configuration example ·························································································· 52
Troubleshooting DHCP server configuration ··············································································································· 53
Symptom ································································································································································· 53
Analysis ·································································································································································· 53
Solution ··································································································································································· 54
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