Concept Guide

DCBx Operation........................................................................................................................................................281
DCBx Port Roles...................................................................................................................................................... 282
DCB Conguration Exchange.................................................................................................................................283
Conguration Source Election................................................................................................................................283
Propagation of DCB Information............................................................................................................................284
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 284
DCBx Example......................................................................................................................................................... 285
DCBx Prerequisites and Restrictions.....................................................................................................................285
Conguring DCBx....................................................................................................................................................285
Verifying the DCB Conguration................................................................................................................................. 289
QoS dot1p Trac Classication and Queue Assignment.......................................................................................... 297
Conguring the Dynamic Buer Method................................................................................................................... 298
Sample DCB Conguration...........................................................................................................................................299
PFC and ETS Conguration Command Examples............................................................................................... 301
13 Dynamic Host Conguration Protocol (DHCP).........................................................................................302
DHCP Packet Format and Options............................................................................................................................. 302
Assign an IP Address using DHCP...............................................................................................................................304
Implementation Information......................................................................................................................................... 305
Congure the System to be a DHCP Server............................................................................................................. 305
Conguring the Server for Automatic Address Allocation..................................................................................306
Specifying a Default Gateway................................................................................................................................ 307
Congure a Method of Hostname Resolution..................................................................................................... 308
Using DNS for Address Resolution........................................................................................................................308
Using NetBIOS WINS for Address Resolution..................................................................................................... 308
Creating Manual Binding Entries............................................................................................................................308
Debugging the DHCP Server.................................................................................................................................309
Using DHCP Clear Commands.............................................................................................................................. 309
Congure the System to be a DHCP Client...............................................................................................................309
Conguring the DHCP Client System....................................................................................................................310
DHCP Client on a Management Interface..............................................................................................................311
DHCP Client Operation with Other Features........................................................................................................312
DHCP Relay When DHCP Server and Client are in Dierent VRFs.........................................................................313
Conguring Route Leaking between VRFs on DHCP Relay Agent.................................................................... 313
Non-default VRF conguration for DHCPv6 helper address....................................................................................314
Conguring DHCP relay source interface....................................................................................................................314
Global DHCP relay source IPv4 or IPv6 conguration ........................................................................................314
Interface level DHCP relay source IPv4 or IPv6 conguration .......................................................................... 315
Congure the System for User Port Stacking (Option 230).................................................................................... 316
Congure Secure DHCP................................................................................................................................................316
Option 82...................................................................................................................................................................317
DHCP Snooping........................................................................................................................................................317
Conguring the DHCP secondary-subnet............................................................................................................322
Drop DHCP Packets on Snooped VLANs Only....................................................................................................322
Dynamic ARP Inspection.........................................................................................................................................323
Conguring Dynamic ARP Inspection................................................................................................................... 323
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