R211x-HP Flexfabric 11900 Layer 3 - IP Services Configuration Guide
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DHCP relay agent support for Option 82 ·········································································································· 54
DHCP relay agent configuration task list ····················································································································· 54
Enabling DHCP ······························································································································································ 55
Enabling the DHCP relay agent on an interface ········································································································ 55
Specifying DHCP servers on a relay agent ················································································································· 55
Configuring the DHCP relay agent security functions ································································································ 56
Enabling the DHCP relay agent to record relay entries ···················································································· 56
Enabling periodic refresh of dynamic relay entries ··························································································· 56
Enabling DHCP starvation attack protection ······································································································ 57
Configuring the DHCP relay agent to release an IP address ···················································································· 58
Configuring Option 82 ················································································································································· 58
Setting the DSCP value for DHCP packets sent by the DHCP relay agent ······························································· 59
Displaying and maintaining the DHCP relay agent ··································································································· 59
DHCP relay agent configuration examples ················································································································· 59
DHCP relay agent configuration example ·········································································································· 59
Option 82 configuration example ······················································································································· 60
Troubleshooting DHCP relay agent configuration ······································································································ 61
Symptom ································································································································································· 61
Analysis ·································································································································································· 61
Solution ··································································································································································· 61
Configuring the DHCP client ····································································································································· 62
Enabling the DHCP client on an interface ··················································································································· 62
Configuring a DHCP client ID for an interface ··········································································································· 62
Enabling duplicated address detection ······················································································································· 63
Setting the DSCP value for DHCP packets sent by the DHCP client ········································································· 63
Displaying and maintaining the DHCP client ·············································································································· 64
DHCP client configuration example ····························································································································· 64
Network requirements ··········································································································································· 64
Configuration procedure ······································································································································ 65
Verifying the configuration ··································································································································· 65
Configuring DHCP snooping ····································································································································· 67
Overview ········································································································································································· 67
Application of trusted and untrusted ports ·········································································································· 67
DHCP snooping support for Option 82 ·············································································································· 68
DHCP snooping configuration task list ························································································································ 69
Configuring basic DHCP snooping ······························································································································ 69
Configuring Option 82 ················································································································································· 70
Saving DHCP snooping entries ···································································································································· 71
Enabling DHCP starvation attack protection ··············································································································· 72
Enabling DHCP-REQUEST attack protection ··············································································································· 73
Setting the maximum number of DHCP snooping entries ·························································································· 73
Configuring DHCP packet rate limit ····························································································································· 74
Displaying and maintaining DHCP snooping ············································································································· 74
DHCP snooping configuration examples ····················································································································· 75
Basic DHCP snooping configuration example ··································································································· 75
Option 82 configuration example ······················································································································· 76
Configuring the BOOTP client ··································································································································· 78
BOOTP application ························································································································································ 78
Obtaining an IP address dynamically ························································································································· 78
Protocols and standards ················································································································································ 78
Configure an interface to use BOOTP for IP address acquisition ············································································· 78
Displaying and maintaining BOOTP client ················································································································· 79
BOOTP client configuration example ·························································································································· 79