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Network requirements ··········································································································································· 22
Configuration procedure ······································································································································ 22
Verifying the configuration ··································································································································· 23
DHCP overview ·························································································································································· 24
DHCP address allocation ·············································································································································· 24
Allocation mechanisms ········································································································································· 24
IP address allocation process ······························································································································· 25
IP address lease extension···································································································································· 25
DHCP message format ··················································································································································· 26
DHCP options ································································································································································· 27
Common DHCP options ········································································································································ 27
Custom DHCP options ··········································································································································· 27
Protocols and standards ················································································································································ 29
Configuring the DHCP server ···································································································································· 31
Overview ········································································································································································· 31
DHCP address pool ··············································································································································· 31
IP address allocation sequence ···························································································································· 33
DHCP server configuration task list ······························································································································ 33
Configuring an address pool on the DHCP server ····································································································· 34
Configuration task list ··········································································································································· 34
Creating a DHCP address pool ··························································································································· 34
Specifying IP address ranges for a DHCP address pool ·················································································· 34
Specifying gateways for DHCP clients ················································································································ 37
Specifying a domain name suffix for DHCP clients ··························································································· 38
Specifying DNS servers for DHCP clients ··········································································································· 38
Specifying WINS servers and NetBIOS node type for DHCP clients ······························································ 38
Specifying BIMS server for DHCP clients ············································································································ 39
Specifying the configuration file for DHCP client auto-configuration ······························································ 39
Specifying a server for DHCP clients ·················································································································· 40
Configuring Option 184 parameters for DHCP clients ····················································································· 41
Customizing DHCP options ·································································································································· 41
Enabling DHCP ······························································································································································ 42
Enabling the DHCP server on an interface ·················································································································· 42
Applying an address pool on an interface ················································································································· 43
Configuring IP address conflict detection ···················································································································· 43
Enabling handling of Option 82 ·································································································································· 44
Configuring DHCP server compatibility ······················································································································· 44
Configuring the DHCP server to broadcast all responses ················································································· 44
Configure the DHCP server to ignore BOOTP requests ···················································································· 44
Configuring the DHCP server to send BOOTP responses in RFC 1048 format·············································· 45
Setting the DSCP value for DHCP packets sent by the DHCP server ········································································ 45
Displaying and maintaining the DHCP server ············································································································ 46
DHCP server configuration examples ·························································································································· 46
Static IP address assignment configuration example························································································· 46
Dynamic IP address assignment configuration example ··················································································· 48
DHCP user class configuration example ············································································································· 49
Primary and secondary subnets configuration example ··················································································· 51
DHCP option customization configuration example ·························································································· 52
Troubleshooting DHCP server configuration ··············································································································· 53
Symptom ································································································································································· 53
Analysis ·································································································································································· 53
Solution ··································································································································································· 53
