iii
Configuring DHCP binding auto backup ·········································································································· 52
Configuring address pool usage alarming ······································································································· 53
Binding gateways to a common MAC address ································································································ 53
Advertising subnets assigned to clients ··········································································································· 54
Applying a DHCP address pool to a VPN instance ·························································································· 55
Enabling client offline detection on the DHCP server ······················································································ 55
Configuring DHCP logging on the DHCP server ······························································································ 56
Displaying and maintaining the DHCP server ·································································································· 56
DHCP server configuration examples ·············································································································· 57
Static IP address assignment configuration example ·············································································· 57
Dynamic IP address assignment configuration example ········································································· 58
DHCP user class configuration example ·································································································· 60
DHCP user class whitelist configuration example ···················································································· 61
Primary and secondary subnets configuration example ·········································································· 62
DHCP option customization configuration example ················································································· 63
Troubleshooting DHCP server configuration ··································································································· 65
Symptom ·················································································································································· 65
Analysis ···················································································································································· 65
Solution ···················································································································································· 65
Configuring the DHCP relay agent ································································ 66
Overview ·························································································································································· 66
Operation ················································································································································· 66
DHCP relay agent support for Option 82 ································································································· 67
DHCP relay agent configuration task list ········································································································· 67
Enabling DHCP ················································································································································ 68
Enabling the DHCP relay agent on an interface ······························································································ 68
Specifying DHCP servers on a relay agent ······································································································ 68
Configuring the DHCP relay agent security functions ······················································································ 69
Enabling the DHCP relay agent to record relay entries ··········································································· 69
Enabling periodic refresh of dynamic relay entries ·················································································· 69
Enabling DHCP starvation attack protection ···························································································· 70
Configuring the DHCP relay agent to release an IP address ··········································································· 71
Configuring Option 82 ······································································································································ 71
Setting the DSCP value for DHCP packets sent by the DHCP relay agent ····················································· 72
Enabling DHCP server proxy on a DHCP relay agent ····················································································· 72
Configuring a DHCP relay address pool ·········································································································· 73
Specifying a gateway address for DHCP clients ······························································································ 74
Enabling client offline detection on the DHCP relay agent ·············································································· 74
Specifying the source address and gateway address in DHCP requests ························································ 74
Displaying and maintaining the DHCP relay agent ·························································································· 75
DHCP relay agent configuration examples ······································································································ 75
DHCP relay agent configuration example ································································································ 75
Option 82 configuration example ············································································································· 76
Troubleshooting DHCP relay agent configuration ···························································································· 77
Symptom ·················································································································································· 77
Analysis ···················································································································································· 77
Solution ···················································································································································· 77
Configuring the DHCP client ········································································· 78
Enabling the DHCP client on an interface ········································································································ 78
Configuring a DHCP client ID for an interface ································································································· 78
Enabling duplicated address detection ············································································································ 79
Setting the DSCP value for DHCP packets sent by the DHCP client ······························································ 79
Displaying and maintaining the DHCP client ··································································································· 79
DHCP client configuration example ················································································································· 80
Network requirements ······························································································································ 80
Configuration procedure ··························································································································· 80
Verifying the configuration ························································································································ 81
Configuring DHCP snooping ········································································· 83
Overview ·························································································································································· 83
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