Concept Guide

Congure the System to be a DHCP Server.............................................................................................................. 315
Conguring the Server for Automatic Address Allocation...................................................................................316
Specifying a Default Gateway................................................................................................................................. 317
Congure a Method of Hostname Resolution...................................................................................................... 318
Using DNS for Address Resolution.........................................................................................................................318
Using NetBIOS WINS for Address Resolution...................................................................................................... 318
Creating Manual Binding Entries............................................................................................................................ 318
Debugging the DHCP Server..................................................................................................................................319
Using DHCP Clear Commands............................................................................................................................... 319
Congure the System to be a DHCP Client................................................................................................................319
Conguring the DHCP Client System...................................................................................................................320
DHCP Client on a Management Interface.............................................................................................................321
DHCP Client Operation with Other Features.......................................................................................................322
DHCP Relay When DHCP Server and Client are in Dierent VRFs........................................................................ 323
Conguring Route Leaking between VRFs on DHCP Relay Agent................................................................... 323
Non-default VRF conguration for DHCPv6 helper address................................................................................... 324
Conguring DHCP relay source interface................................................................................................................... 324
Global DHCP relay source IPv4 or IPv6 conguration ....................................................................................... 324
Interface level DHCP relay source IPv4 or IPv6 conguration ..........................................................................325
Congure the System for User Port Stacking (Option 230)....................................................................................326
Congure Secure DHCP............................................................................................................................................... 326
Option 82.................................................................................................................................................................. 327
DHCPv6 relay agent options.................................................................................................................................. 328
DHCP Snooping.......................................................................................................................................................328
Conguring the DHCP secondary-subnet............................................................................................................332
Drop DHCP Packets on Snooped VLANs Only....................................................................................................333
Dynamic ARP Inspection.........................................................................................................................................333
Conguring Dynamic ARP Inspection................................................................................................................... 334
Source Address Validation............................................................................................................................................ 335
Enabling IP Source Address Validation..................................................................................................................335
DHCP MAC Source Address Validation................................................................................................................ 336
Enabling IP+MAC Source Address Validation.......................................................................................................336
Viewing the Number of SAV Dropped Packets....................................................................................................337
Clearing the Number of SAV Dropped Packets................................................................................................... 337
14 Equal Cost Multi-Path (ECMP)................................................................................................................ 338
ECMP for Flow-Based Anity.....................................................................................................................................338
Conguring the Hash Algorithm............................................................................................................................ 338
Enabling Deterministic ECMP Next Hop.............................................................................................................. 338
Conguring the Hash Algorithm Seed.................................................................................................................. 339
Link Bundle Monitoring................................................................................................................................................. 339
Managing ECMP Group Paths...............................................................................................................................340
Creating an ECMP Group Bundle..........................................................................................................................340
Modifying the ECMP Group Threshold.................................................................................................................340
Support for /128 IPv6 and /32 IPv4 Prexes in Layer 3 Host Table and LPM Table.......................................341
Support for ECMP in host table............................................................................................................................ 342
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