Concept Guide

DHCP Packet Format and Options.............................................................................................................................. 316
Assign an IP Address using DHCP................................................................................................................................318
Implementation Information.......................................................................................................................................... 319
Congure the System to be a DHCP Server.............................................................................................................. 319
Conguring the Server for Automatic Address Allocation..................................................................................320
Specifying a Default Gateway.................................................................................................................................321
Congure a Method of Hostname Resolution......................................................................................................322
Using DNS for Address Resolution........................................................................................................................322
Using NetBIOS WINS for Address Resolution..................................................................................................... 322
Creating Manual Binding Entries............................................................................................................................322
Debugging the DHCP Server................................................................................................................................. 323
Using DHCP Clear Commands...............................................................................................................................323
Congure the System to be a Relay Agent................................................................................................................ 323
Congure the System to be a DHCP Client............................................................................................................... 325
Conguring the DHCP Client System...................................................................................................................325
DHCP Client on a Management Interface............................................................................................................ 327
DHCP Client Operation with Other Features....................................................................................................... 327
DHCP Relay When DHCP Server and Client are in Dierent VRFs........................................................................ 328
Conguring Route Leaking between VRFs on DHCP Relay Agent................................................................... 328
Non-default VRF conguration for DHCPv6 helper address................................................................................... 329
Conguring DHCP relay source interface...................................................................................................................330
Global DHCP relay source IPv4 or IPv6 conguration ....................................................................................... 330
Interface level DHCP relay source IPv4 or IPv6 conguration ..........................................................................330
Congure the System for User Port Stacking (Option 230)....................................................................................332
Congure Secure DHCP............................................................................................................................................... 332
Option 82..................................................................................................................................................................332
DHCPv6 relay agent options.................................................................................................................................. 333
DHCP Snooping.......................................................................................................................................................333
Drop DHCP Packets on Snooped VLANs Only....................................................................................................338
Dynamic ARP Inspection.........................................................................................................................................338
Conguring Dynamic ARP Inspection................................................................................................................... 339
Source Address Validation............................................................................................................................................ 340
Enabling IP Source Address Validation..................................................................................................................340
DHCP MAC Source Address Validation................................................................................................................. 341
Enabling IP+MAC Source Address Validation........................................................................................................341
Viewing the Number of SAV Dropped Packets....................................................................................................342
Clearing the Number of SAV Dropped Packets................................................................................................... 342
14 Equal Cost Multi-Path (ECMP)................................................................................................................ 343
ECMP for Flow-Based Anity.....................................................................................................................................343
Conguring the Hash Algorithm............................................................................................................................ 343
Enabling Deterministic ECMP Next Hop.............................................................................................................. 343
Conguring the Hash Algorithm Seed.................................................................................................................. 344
Link Bundle Monitoring................................................................................................................................................. 344
Managing ECMP Group Paths...............................................................................................................................345
Creating an ECMP Group Bundle..........................................................................................................................345
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