Juniper ACX1100 Configuration Guide

Dynamic Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
Configuring Dynamic Reconfiguration of DHCP Clients to Avoid Extended Outages
Due to Server Configuration Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
Configuring Dynamic Reconfiguration Attempts for DHCP Clients . . . . . . . . . . . 345
Configuring Deletion of the Client When Dynamic Reconfiguration Fails . . . . . . 346
Requesting DHCP Local Server to Initiate Reconfiguration of Client Bindings . . 347
Clearing DHCP Bindings for Subscriber Access . . . . . . . . . . . . . . . . . . . . . . . . . . 348
Verifying and Managing DHCP Local Server Configuration . . . . . . . . . . . . . . . . . 349
Enabling MAC Address Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Tracing General Authentication Service Processes . . . . . . . . . . . . . . . . . . . . . . . . 351
Configuring the General Authentication Service Processes Trace Log
Filename . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Configuring the Number and Size of General Authentication Service
Processes Log Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Configuring Access to the Log File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Configuring a Regular Expression for Lines to Be Logged . . . . . . . . . . . . . . . 353
Configuring the Trace Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
Tracing Extended DHCP Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
Configuring the Extended DHCP Log Filename . . . . . . . . . . . . . . . . . . . . . . . 354
Configuring the Number and Size of Extended DHCP Log Files . . . . . . . . . . 355
Configuring Access to the Extended DHCP Log File . . . . . . . . . . . . . . . . . . . 355
Configuring a Regular Expression for Extended DHCP Messages to Be
Logged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
Configuring the Extended DHCP Tracing Flags . . . . . . . . . . . . . . . . . . . . . . . 356
Configuring the Severity Level to Filter Which Extended DHCP Messages
Are Logged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Tracing Extended DHCP Operations for Specific Interfaces . . . . . . . . . . . . . 358
Understanding DHCP Client Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Configuring a DHCP Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
Minimum DHCP Client Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
Configuring Optional DHCP Client Attributes . . . . . . . . . . . . . . . . . . . . . . . . 360
Verifying and Managing DHCP Client Configuration . . . . . . . . . . . . . . . . . . . 361
DHCP Duplicate Client Differentiation Using Client Subinterface Overview . . . . 362
Guidelines for Configuring Support for DHCP Duplicate Clients . . . . . . . . . . . . . 363
Configuring DHCP Duplicate Client Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
Chapter 11 Configuring DHCP and DHCPv6 Relay Agent . . . . . . . . . . . . . . . . . . . . . . . . 367
DHCP Relay Agent on ACX Series Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368
DHCPv6 Relay Agent on ACX Series Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
Inserting the DHCPv6 Interface Identifier into DHCPv6 Packets . . . . . . . . . . . . . 371
Configuring Group-Specific DHCP Relay Options . . . . . . . . . . . . . . . . . . . . . . . . . 372
Overriding the Default DHCP Relay Configuration Settings . . . . . . . . . . . . . . . . . 373
Changing the Gateway IP Address (giaddr) Field to the giaddr of the DHCP Relay
Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Replacing the DHCP Relay Request and Release Packet Source Address . . . . . 376
Overriding Option 82 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
Using Layer 2 Unicast Transmission for DHCP Packets . . . . . . . . . . . . . . . . . . . . . 377
Trusting Option 82 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
Specifying the Maximum Number of DHCP Clients Per Interface . . . . . . . . . . . . 378
xiCopyright © 2017, Juniper Networks, Inc.
Table of Contents

Juniper ACX1100 Specifications

General

Brand	Juniper
Model	ACX1100
Category	Network Router
Language	English