Setup Guide

Troubleshoot an Over-Temperature Condition...................................................................................................... 341
Troubleshooting Packet Loss........................................................................................................................................343
Displaying Drop Counters........................................................................................................................................343
Displaying Dataplane Statistics...............................................................................................................................344
Displaying Line-Card Counters...............................................................................................................................346
Accessing Application Core Dumps.............................................................................................................................346
Mini Core Dumps............................................................................................................................................................347
Full Kernel Core Dumps.................................................................................................................................................348
Enabling TCP Dumps.....................................................................................................................................................348
Accessing Port Extender Core and Mini Core Dumps.............................................................................................. 349
13 Dynamic Host Conguration Protocol (DHCP).........................................................................................350
DHCP Packet Format and Options............................................................................................................................. 350
Assign an IP Address using DHCP...............................................................................................................................352
Implementation Information..........................................................................................................................................353
Congure the System to be a DHCP Server............................................................................................................. 353
Conguring the Server for Automatic Address Allocation..................................................................................354
Specifying a Default Gateway................................................................................................................................355
Congure a Method of Hostname Resolution..................................................................................................... 356
Using DNS for Address Resolution........................................................................................................................356
Using NetBIOS WINS for Address Resolution..................................................................................................... 356
Creating Manual Binding Entries............................................................................................................................356
Debugging the DHCP Server................................................................................................................................. 357
Using DHCP Clear Commands...............................................................................................................................357
Congure the System to be a Relay Agent................................................................................................................ 357
Congure the System to be a DHCP Client...............................................................................................................359
DHCP Client on a Management Interface............................................................................................................359
DHCP Client Operation with Other Features.......................................................................................................359
DHCP Relay When DHCP Server and Client are in Dierent VRFs........................................................................360
Conguring Route Leaking between VRFs on DHCP Relay Agent....................................................................361
Non-default VRF conguration for DHCPv6 helper address...................................................................................362
Conguring DHCP relay source interface...................................................................................................................362
Global DHCP relay source IPv4 or IPv6 conguration ....................................................................................... 362
Interface level DHCP relay source IPv4 or IPv6 conguration ..........................................................................363
Congure Secure DHCP...............................................................................................................................................364
Option 82..................................................................................................................................................................364
DHCPv6 relay agent options..................................................................................................................................365
DHCP Snooping.......................................................................................................................................................365
Drop DHCP Packets on Snooped VLANs Only....................................................................................................367
Dynamic ARP Inspection........................................................................................................................................ 368
Conguring Dynamic ARP Inspection................................................................................................................... 369
Source Address Validation.............................................................................................................................................370
Enabling IP Source Address Validation.................................................................................................................. 370
DHCP MAC Source Address Validation................................................................................................................. 371
Enabling IP+MAC Source Address Validation........................................................................................................371
Viewing the Number of SAV Dropped Packets....................................................................................................372
Contents
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