Concept Guide

DCBx Example..........................................................................................................................................................277
DCBx Prerequisites and Restrictions..................................................................................................................... 277
Conguring DCBx.....................................................................................................................................................277
Verifying the DCB Conguration.................................................................................................................................. 281
QoS dot1p Trac Classication and Queue Assignment..........................................................................................289
Conguring the Dynamic Buer Method................................................................................................................... 290
Sample DCB Conguration........................................................................................................................................... 291
PFC and ETS Conguration Command Examples...............................................................................................293
12 Dynamic Host Conguration Protocol (DHCP).........................................................................................294
DHCP Packet Format and Options............................................................................................................................. 294
Assign an IP Address using DHCP...............................................................................................................................296
Implementation Information..........................................................................................................................................297
Congure the System to be a DHCP Server..............................................................................................................297
Conguring the Server for Automatic Address Allocation..................................................................................298
Specifying a Default Gateway................................................................................................................................ 299
Congure a Method of Hostname Resolution..................................................................................................... 300
Using DNS for Address Resolution........................................................................................................................300
Using NetBIOS WINS for Address Resolution..................................................................................................... 300
Creating Manual Binding Entries........................................................................................................................... 300
Debugging the DHCP Server..................................................................................................................................301
Using DHCP Clear Commands............................................................................................................................... 301
Congure the System to be a DHCP Client................................................................................................................301
Conguring the DHCP Client System...................................................................................................................302
DHCP Client on a Management Interface............................................................................................................303
DHCP Client Operation with Other Features.......................................................................................................304
DHCP Relay When DHCP Server and Client are in Dierent VRFs........................................................................305
Conguring Route Leaking between VRFs on DHCP Relay Agent................................................................... 305
Non-default VRF conguration for DHCPv6 helper address...................................................................................306
Conguring DHCP relay source interface...................................................................................................................306
Global DHCP relay source IPv4 or IPv6 conguration .......................................................................................306
Interface level DHCP relay source IPv4 or IPv6 conguration ..........................................................................307
Congure the System for User Port Stacking (Option 230)................................................................................... 308
Congure Secure DHCP...............................................................................................................................................308
Option 82..................................................................................................................................................................309
DHCP Snooping.......................................................................................................................................................309
Drop DHCP Packets on Snooped VLANs Only.....................................................................................................314
Dynamic ARP Inspection......................................................................................................................................... 314
Conguring Dynamic ARP Inspection....................................................................................................................315
Source Address Validation............................................................................................................................................. 316
Enabling IP Source Address Validation...................................................................................................................316
DHCP MAC Source Address Validation................................................................................................................. 317
Enabling IP+MAC Source Address Validation........................................................................................................317
Viewing the Number of SAV Dropped Packets.................................................................................................... 318
Clearing the Number of SAV Dropped Packets....................................................................................................318
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