Reference Guide

Table Of Contents
Configuring DCBx......................................................................................................................................................275
Verifying the DCB Configuration.................................................................................................................................279
QoS dot1p Traffic Classification and Queue Assignment...................................................................................... 287
Configuring the Dynamic Buffer Method..................................................................................................................288
Sample DCB Configuration...........................................................................................................................................289
Chapter 13: Dynamic Host Configuration Protocol (DHCP)........................................................ 292
DHCP Packet Format and Options.............................................................................................................................292
Assign an IP Address using DHCP.............................................................................................................................. 294
Implementation Information......................................................................................................................................... 294
Configure the System to be a DHCP Server........................................................................................................... 295
Configuring the Server for Automatic Address Allocation..............................................................................295
Specifying a Default Gateway................................................................................................................................296
Configure a Method of Hostname Resolution....................................................................................................297
Using DNS for Address Resolution....................................................................................................................... 297
Using NetBIOS WINS for Address Resolution....................................................................................................297
Creating Manual Binding Entries........................................................................................................................... 297
Debugging the DHCP Server................................................................................................................................. 298
Using DHCP Clear Commands...............................................................................................................................298
Configure the System to be a Relay Agent.............................................................................................................. 298
Configure the System to be a DHCP Client.............................................................................................................300
Configuring the DHCP Client System.................................................................................................................. 300
DHCP Client on a Management Interface........................................................................................................... 301
DHCP Client Operation with Other Features.....................................................................................................302
DHCP Relay When DHCP Server and Client are in Different VRFs................................................................... 303
Configuring Route Leaking between VRFs on DHCP Relay Agent...............................................................303
Non-default VRF configuration for DHCPv6 helper address...............................................................................304
Configuring DHCP relay source interface.................................................................................................................304
Global DHCP relay source IPv4 or IPv6 configuration ....................................................................................304
Interface level DHCP relay source IPv4 or IPv6 configuration .....................................................................305
Configure the System for User Port Stacking (Option 230)............................................................................... 306
Configure Secure DHCP............................................................................................................................................... 306
Option 82 (DHCPv4 relay options).......................................................................................................................306
DHCPv6 relay agent options.................................................................................................................................. 307
DHCP Snooping......................................................................................................................................................... 307
Drop DHCP Packets on Snooped VLANs Only................................................................................................... 312
Dynamic ARP Inspection.......................................................................................................................................... 312
Configuring Dynamic ARP Inspection................................................................................................................... 312
Source Address Validation.............................................................................................................................................314
Enabling IP Source Address Validation................................................................................................................. 314
DHCP MAC Source Address Validation................................................................................................................314
Enabling IP+MAC Source Address Validation..................................................................................................... 315
Viewing the Number of SAV Dropped Packets.................................................................................................. 315
Clearing the Number of SAV Dropped Packets..................................................................................................316
Chapter 14: Equal Cost Multi-Path (ECMP)................................................................................317
ECMP for Flow-Based Affinity..................................................................................................................................... 317
Configuring the Hash Algorithm............................................................................................................................. 317
Enabling Deterministic ECMP Next Hop.............................................................................................................. 317
Contents
9