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Table of Contents
1 DHCP Overview··········································································································································1-1
Introduction to DHCP ······························································································································1-1
DHCP IP Address Assignment ···············································································································1-1
IP Address Assignment Policy ········································································································1-1
Obtaining IP Addresses Dynamically ······························································································1-2
Updating IP Address Lease·············································································································1-2
DHCP Packet Format······························································································································1-3
Protocol Specification······························································································································1-4
2 DHCP Relay Agent Configuration············································································································2-1
Introduction to DHCP Relay Agent ·········································································································2-1
Usage of DHCP Relay Agent ··········································································································2-1
DHCP Relay Agent Fundamentals··································································································2-1
Option 82 Support on DHCP Relay Agent ······················································································2-2
Configuring the DHCP Relay Agent········································································································2-3
DHCP Relay Agent Configuration Task List····················································································2-4
Enabling DHCP ·······························································································································2-4
Correlating a DHCP Server Group with a Relay Agent Interface····················································2-4
Configuring DHCP Relay Agent Security Functions ·······································································2-5
Configuring the DHCP Relay Agent to Support Option 82······························································2-7
Displaying and Maintaining DHCP Relay Agent Configuration·······························································2-8
DHCP Relay Agent Configuration Example····························································································2-8
Troubleshooting DHCP Relay Agent Configuration················································································2-9
3 DHCP Snooping Configuration ················································································································3-1
DHCP Snooping Overview······················································································································3-1
Introduction to DHCP Snooping ······································································································3-1
Introduction to DHCP-Snooping Option 82 ·····················································································3-2
Configuring DHCP Snooping ··················································································································3-4
Configuring DHCP Snooping···········································································································3-4
Configuring DHCP Snooping to Support Option 82 ········································································3-5
Displaying and Maintaining DHCP Snooping Configuration···································································3-8
DHCP Snooping Configuration Examples ······························································································3-8
DHCP-Snooping Option 82 Support Configuration Example··························································3-8
4 DHCP/BOOTP Client Configuration·········································································································4-1
Introduction to DHCP Client····················································································································4-1
Introduction to BOOTP Client ·················································································································4-1
Configuring a DHCP/BOOTP Client········································································································4-2
DHCP Client Configuration Example·······························································································4-2
BOOTP Client Configuration Example ····························································································4-3
Displaying DHCP/BOOTP Client Configuration······················································································4-3