Concept Guide

Conguration Source Election................................................................................................................................277
Propagation of DCB Information............................................................................................................................278
Auto-Detection and Manual Conguration of the DCBx Version.......................................................................278
DCBx Example..........................................................................................................................................................278
DCBx Prerequisites and Restrictions.....................................................................................................................279
Conguring DCBx.................................................................................................................................................... 279
Verifying the DCB Conguration..................................................................................................................................283
Sample DCB Conguration........................................................................................................................................... 291
PFC and ETS Conguration Command Examples...............................................................................................293
QoS dot1p Trac Classication and Queue Assignment..........................................................................................293
Conguring the Dynamic Buer Method................................................................................................................... 294
13 Dynamic Host Conguration Protocol (DHCP).........................................................................................296
DHCP Packet Format and Options............................................................................................................................. 296
Assign an IP Address using DHCP...............................................................................................................................298
Implementation Information..........................................................................................................................................299
Congure the System to be a DHCP Server............................................................................................................. 299
Conguring the Server for Automatic Address Allocation..................................................................................300
Specifying a Default Gateway.................................................................................................................................301
Congure a Method of Hostname Resolution...................................................................................................... 301
Using DNS for Address Resolution.........................................................................................................................301
Using NetBIOS WINS for Address Resolution..................................................................................................... 302
Creating Manual Binding Entries............................................................................................................................302
Debugging the DHCP Server.................................................................................................................................302
Using DHCP Clear Commands.............................................................................................................................. 303
Congure the System to be a Relay Agent................................................................................................................ 303
Congure the System to be a DHCP Client...............................................................................................................305
DHCP Client Operation with Other Features.......................................................................................................305
DHCP Client on a Management Interface............................................................................................................306
Congure the System for User Port Stacking (Option 230)....................................................................................307
Conguring DHCP relay source interface................................................................................................................... 307
Global DHCP relay source IPv4 or IPv6 conguration ....................................................................................... 307
Interface level DHCP relay source IPv4 or IPv6 conguration ..........................................................................308
Congure Secure DHCP...............................................................................................................................................309
Option 82..................................................................................................................................................................309
DHCP Snooping........................................................................................................................................................310
Conguring the DHCP secondary-subnet.............................................................................................................314
Drop DHCP Packets on Snooped VLANs Only.................................................................................................... 315
Dynamic ARP Inspection......................................................................................................................................... 315
Conguring Dynamic ARP Inspection....................................................................................................................316
Source Address Validation............................................................................................................................................. 317
Enabling IP Source Address Validation................................................................................................................... 317
DHCP MAC Source Address Validation................................................................................................................. 318
Enabling IP+MAC Source Address Validation........................................................................................................318
Viewing the Number of SAV Dropped Packets.................................................................................................... 319
Clearing the Number of SAV Dropped Packets....................................................................................................319
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