HP 6125XLG Layer 3-Ip Services Configuration Manual page 5

Configuring the DHCP relay agent ··························································································································· 55
Overview ········································································································································································· 55
Operation ······························································································································································· 55
DHCP relay agent support for Option 82 ·········································································································· 56
DHCP relay agent configuration task list ····················································································································· 56
Enabling DHCP ······························································································································································ 57
Enabling the DHCP relay agent on an interface ········································································································ 57
Specifying DHCP servers on a relay agent ················································································································· 57
Configuring the DHCP relay agent security functions ································································································ 58
Enabling the DHCP relay agent to record relay entries ···················································································· 58
Enabling periodic refresh of dynamic relay entries ··························································································· 58
Enabling DHCP starvation attack protection ······································································································ 59
Configuring the DHCP relay agent to release an IP address ···················································································· 60
Configuring Option 82 ················································································································································· 60
Setting the DSCP value for DHCP packets sent by the DHCP relay agent ······························································· 61
Displaying and maintaining the DHCP relay agent ··································································································· 61
DHCP relay agent configuration examples ················································································································· 61
DHCP relay agent configuration example ·········································································································· 61
Option 82 configuration example ······················································································································· 62
Troubleshooting DHCP relay agent configuration ······································································································ 63
Symptom ································································································································································· 63
Analysis ·································································································································································· 63
Solution ··································································································································································· 63
Configuring the DHCP client ····································································································································· 64
Enabling the DHCP client on an interface ··················································································································· 64
Configuring a DHCP client ID for an interface ··········································································································· 64
Enabling duplicated address detection ······················································································································· 65
Setting the DSCP value for DHCP packets sent by the DHCP client ········································································· 65
Displaying and maintaining the DHCP client ·············································································································· 66
DHCP client configuration example ····························································································································· 66
Network requirements ··········································································································································· 66
Configuration procedure ······································································································································ 66
Verifying the configuration ··································································································································· 67
Configuring DHCP snooping ····································································································································· 69
Overview ········································································································································································· 69
Application of trusted and untrusted ports ·········································································································· 69
DHCP snooping support for Option 82 ·············································································································· 70
DHCP snooping configuration task list ························································································································ 71
Configuring basic DHCP snooping ······························································································································ 71
Configuring Option 82 ················································································································································· 72
Saving DHCP snooping entries ···································································································································· 73
Enabling DHCP starvation attack protection ··············································································································· 74
Enabling DHCP-REQUEST attack protection ··············································································································· 74
Setting the maximum number of DHCP snooping entries ·························································································· 75
Configuring DHCP packet rate limit ····························································································································· 75
Displaying and maintaining DHCP snooping ············································································································· 76
DHCP snooping configuration examples ····················································································································· 77
Basic DHCP snooping configuration example ··································································································· 77
Option 82 configuration example ······················································································································· 77
Configuring the BOOTP client ··································································································································· 79
BOOTP application ························································································································································ 79
Obtaining an IP address dynamically ························································································································· 79
Protocols and standards ················································································································································ 79
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