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Home > Support > Technical Documentation > JunosE Software > DHCP Relay and Relay Proxy on E Series Broadband Services Routers, Release 13.2
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DHCP Relay and Relay Proxy on E Series Broadband Services Routers, Release 13.2

The DHCP relay feature relays a request from a remote client to a DHCP server for an IP address and passes the response back to the IP client. The DHCP relay proxy manages host routes for DHCP clients, and determines which offer to use when there are multiple DHCP servers configured.


This page provides information that you can use to configure E Series routers to function as a DHCP relay and a relay proxy.


JunosE Software Documentation for E Series Broadband Services Routers, Release 13.2

  • Overview
  • Configuration
  • Administration
  • Troubleshooting
How DHCP Relay Works

DHCP Relay and BOOTP Relay Overview

DHCP Option 60 Attribute for Traffic Forwarding

Using Option 60 Strings to Forward Client Traffic to Specific DHCP Servers

DHCP Option 82 Attribute and Suboptions for Traffic Forwarding

DHCP Relay Agent Information Option (Option 82) Suboption Values Overview

How DHCP Relay Works

Rate of DHCP Client Packets Processed by DHCP Relay Overview

Configuration Tasks for DHCP Relay Functions

Configuring DHCP Relay Settings

Configuring DHCP Relay Proxy

Managing Host Routes Using DHCP Relay Proxy

Broadcast Flag Settings for DHCP Relay

Using the Broadcast Flag Setting to Control Transmission of DHCP Reply Packets

Interaction of DHCP Relay Broadcast Flag with the Layer 2 Unicast Transmission Method

Configuring Baselines for DHCP Relay and Relay Proxy Statistics

Setting Baselines for DHCP Statistics

Preventing Host Routes Installation

Preventing DHCP Relay from Installing Host Routes by Default

Including Relay Agent Option Values in the PPPoE Remote Circuit ID

Configuring DHCP Option 60 for Relaying Packets

Configuring the DHCP Relay Option 60 Attribute for Traffic Forwarding

Relaying DHCP Packets That Originate from a Cable Modem

Configuring DHCP Option 82 and Suboptions for Relaying Packets

Configuring the DHCP Relay Agent Option 82 Settings

Using the set dhcp relay agent Command to Enable Option 82 Suboption Support

Using the set dhcp relay agent sub-option Command to Enable Option 82 Suboption Support

Unicast Tranmission of DHCP Replies

Configuring the Layer 2 Unicast Transmission Method for Reply Packets to DHCP Clients

Examples

Example: Preventing Installation of Host Routes

Example: Using DHCP Relay Option 82 to Pass IEEE 802.1p Values to DHCP Servers

Configuration Commands

interface ip

ip route

ip share-interface

ip source-prefix

ip unnumbered

service dhcp-local

set dhcp relay

set dhcp relay agent sub-option

set dhcp relay assign-giaddr-source-ip

set dhcp relay broadcast-flag-replies

set dhcp relay giaddr-selects-interface

set dhcp relay layer2-unicast-replies

set dhcp relay max-client-packet-rate

set dhcp relay options

set dhcp relay override

set dhcp relay preserve-trusted-client-option

set dhcp relay proxy send-first-offer

set dhcp relay proxy timeout

set dhcp relay trust-all

set dhcp vendor-option

Monitoring DHCP Relay and Relay Proxy Settings

Monitoring DHCP Relay Configuration Information

Monitoring DHCP Option 60 Information

Monitoring DHCP Packet Capture Settings

Monitoring DHCP Relay and Relay Proxy Statistics

Monitoring DHCP Relay Statistics

Monitoring DHCP Relay Proxy Statistics

Monitoring Commands

show dhcp relay

show dhcp relay proxy statistics

show dhcp relay statistics

show dhcp vendor-option

Knowledge Base

Giaddr field set to 0 after removing and reconfiguring loopback interface.

Sample configurations of Standalone DHCP Server and DHCP Relay on ERX

How does DHCP host route preservation work?

E-series fails to process ARP requests/responses from clients in a static subscriber interface configuration

Shell Commands to troubleshoot DHCP Relay

DHCP relay proxy statistics get out of sync

DHCP relay drops AccIntern-route

Unable to delete DHCP Relay Access-Internal routes with 'set dhcp relay discard-access-routes all' command

DHCP Relay/Proxy cannot be configured following the 'set dhcp relay' command

 

Downloads

  • Broadband Access Configuration Guide, Release 13.2.0 PDF Document
  • DHCP Relay and Relay Proxy on E Series Broadband Services Routers PDF Document
 
 
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