R0106-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V7)
iii
Configuring the DHCP relay agent security functions ································································································ 55
Enabling the DHCP relay agent to record relay entries ···················································································· 55
Enabling periodic refresh of dynamic relay entries ··························································································· 55
Enabling DHCP starvation attack protection ······································································································ 56
Configuring the DHCP relay agent to release an IP address ···················································································· 57
Configuring Option 82 ················································································································································· 57
Setting the DSCP value for DHCP packets sent by the DHCP relay agent ······························································· 58
Displaying and maintaining the DHCP relay agent ··································································································· 58
DHCP relay agent configuration examples ················································································································· 59
DHCP relay agent configuration example ·········································································································· 59
Option 82 configuration example ······················································································································· 60
Troubleshooting DHCP relay agent configuration ······································································································ 60
Symptom ································································································································································· 60
Analysis ·································································································································································· 60
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 ······································································································································ 64
Verifying the configuration ··································································································································· 65
Configuring DHCP snooping ····································································································································· 67
Overview ········································································································································································· 67
Application of trusted and untrusted ports ·········································································································· 67
DHCP snooping support for Option 82 ·············································································································· 68
Feature and hardware compatibility ···························································································································· 69
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 ··············································································································· 72
Setting the maximum number of DHCP snooping entries ·························································································· 73
Displaying and maintaining DHCP snooping ············································································································· 73
DHCP snooping configuration examples ····················································································································· 74
Basic DHCP snooping configuration example ··································································································· 74
Option 82 configuration example ······················································································································· 75
Configuring the BOOTP client ··································································································································· 77
BOOTP application ························································································································································ 77
Obtaining an IP address dynamically ························································································································· 77
Protocols and standards ················································································································································ 77
Configuring an interface to use BOOTP for IP address acquisition·········································································· 78
Displaying and maintaining BOOTP client ················································································································· 78
BOOTP client configuration example ·························································································································· 78
Network requirements ··········································································································································· 78
Configuration procedure ······································································································································ 78
Configuring DNS ······················································································································································· 79
Overview ········································································································································································· 79