Concept Guide

Congure the System to be a DHCP Server.............................................................................................................. 310
Conguring the Server for Automatic Address Allocation................................................................................... 311
Specifying a Default Gateway.................................................................................................................................312
Congure a Method of Hostname Resolution...................................................................................................... 313
Using DNS for Address Resolution.........................................................................................................................313
Using NetBIOS WINS for Address Resolution...................................................................................................... 313
Creating Manual Binding Entries.............................................................................................................................313
Debugging the DHCP Server..................................................................................................................................314
Using DHCP Clear Commands............................................................................................................................... 314
Congure the System to be a DHCP Client................................................................................................................314
Conguring the DHCP Client System....................................................................................................................315
DHCP Client on a Management Interface.............................................................................................................316
DHCP Client Operation with Other Features........................................................................................................317
DHCP Relay When DHCP Server and Client are in Dierent VRFs.........................................................................318
Conguring Route Leaking between VRFs on DHCP Relay Agent.................................................................... 318
Non-default VRF conguration for DHCPv6 helper address....................................................................................319
Conguring DHCP relay source interface....................................................................................................................319
Global DHCP relay source IPv4 or IPv6 conguration ........................................................................................319
Interface level DHCP relay source IPv4 or IPv6 conguration ..........................................................................320
Congure the System for User Port Stacking (Option 230).................................................................................... 321
Congure Secure DHCP................................................................................................................................................321
Option 82..................................................................................................................................................................322
DHCPv6 relay agent options.................................................................................................................................. 322
DHCP Snooping....................................................................................................................................................... 323
Conguring the DHCP secondary-subnet............................................................................................................ 327
Drop DHCP Packets on Snooped VLANs Only....................................................................................................328
Dynamic ARP Inspection.........................................................................................................................................328
Conguring Dynamic ARP Inspection................................................................................................................... 329
Source Address Validation............................................................................................................................................ 330
Enabling IP Source Address Validation..................................................................................................................330
DHCP MAC Source Address Validation................................................................................................................. 331
Enabling IP+MAC Source Address Validation........................................................................................................331
Viewing the Number of SAV Dropped Packets....................................................................................................332
Clearing the Number of SAV Dropped Packets................................................................................................... 332
14 Equal Cost Multi-Path (ECMP)................................................................................................................ 333
ECMP for Flow-Based Anity.....................................................................................................................................333
Conguring the Hash Algorithm............................................................................................................................ 333
Enabling Deterministic ECMP Next Hop.............................................................................................................. 333
Conguring the Hash Algorithm Seed.................................................................................................................. 334
Link Bundle Monitoring................................................................................................................................................. 334
Managing ECMP Group Paths...............................................................................................................................335
Creating an ECMP Group Bundle..........................................................................................................................335
Modifying the ECMP Group Threshold.................................................................................................................335
Support for /128 IPv6 and /32 IPv4 Prexes in Layer 3 Host Table and LPM Table......................................336
Support for ECMP in host table.............................................................................................................................337
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