R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide
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Troubleshooting DHCP relay agent configuration ······································································································ 61
Symptom ································································································································································· 61
Analysis ·································································································································································· 61
Solution ··································································································································································· 62
Configuring the DHCP client ····································································································································· 63
Enabling the DHCP client on an interface ··················································································································· 63
Configuring a DHCP client ID for an interface ··········································································································· 63
Enabling duplicated address detection ······················································································································· 64
Displaying and maintaining the DHCP client ·············································································································· 64
DHCP client configuration example ····························································································································· 65
Network requirements ··········································································································································· 65
Configuration procedure ······································································································································ 65
Verifying the configuration ··································································································································· 66
Configuring DHCP snooping ····································································································································· 68
Overview ········································································································································································· 68
Application of trusted and untrusted ports ·········································································································· 68
DHCP snooping support for Option 82 ·············································································································· 69
DHCP snooping configuration task list ························································································································ 70
Configuring basic DHCP snooping ······························································································································ 70
Configuring Option 82 ················································································································································· 71
Saving DHCP snooping entries ···································································································································· 72
Enabling DHCP starvation attack protection ··············································································································· 73
Enabling DHCP-REQUEST attack protection ··············································································································· 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 ············································································· 79
Displaying and maintaining BOOTP client ················································································································· 79
BOOTP client configuration example ·························································································································· 79
Network requirements ··········································································································································· 79
Configuration procedure ······································································································································ 79
Configuring DNS ······················································································································································· 80
Overview ········································································································································································· 80
Static domain name resolution ····························································································································· 80
Dynamic domain name resolution ······················································································································· 80
DNS proxy ····························································································································································· 82