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Home > Support > Technical Documentation > JunosE Software > DHCP External Server on E Series Broadband Services Routers, Release 13.2
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DHCP External Server on E Series Broadband Services Routers, Release 13.2

An external DHCP server enables the router, which is not running DHCP relay or DHCP proxy server, to monitor DHCP packets and to keep information for subscribers based on their IP address and MAC address. When a DHCP external server is configured, all DHCP traffic to and from the DHCP server is monitored by the router.


This page provides information about the features you can use to configure the DHCP external server application on E Series routers.


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

  • Overview
  • Configuration
  • Administration
  • Troubleshooting
Understanding the DHCP External Server Functions

DHCP External Server Overview

Preservation of Dynamic Subscriber Interfaces with DHCP External Server Overview

DHCP External Server Identification of Clients with Duplicate MAC Addresses Overview

Prerequisites for Configuring DHCP External Server

DHCP External Server Configuration Requirements

Configuration Tasks for DHCP External Server

Enabling and Disabling the DHCP External Server Application

Synchronizing the DHCP External Application and the Router

Monitoring DHCP Traffic Between Remote Clients and DHCP Servers

Deleting Clients from a Virtual Router’s DHCP Binding Table

Interworking of DHCP External Server and Ethernet DSLAMs

Configuring Interoperation with Ethernet DSLAMs

Dynamic Subscriber Interfaces and DHCP Relay Functions

Configuring the DHCP External Server to Support the Creation of Dynamic Subscriber Interfaces

Configuring DHCP External Server to Control Preservation of Dynamic Subscriber InterfacesConfiguring Dynamic Subscriber Interfaces for Interoperation with DHCP Relay and DHCP Relay Proxy

Duplicate MAC Mode for DHCP External Servers

Configuring DHCP External Server to Control Preservation of Dynamic Subscriber Interfaces

Configuring DHCP External Server to Re-Authenticate Auto-Detected Dynamic Subscriber Interfaces

Configuring Baselines for DHCP External Server Statistics

Setting Baselines for DHCP Statistics

Configuration Commands

dhcp delete-binding

dhcp-external delete-binding

dhcp-external duplicate-mac-address

ip auto-configure ip-subscriber

ip auto-detect ip-subscriber

ip dhcp-external auto-configure

ip dhcp-external disregard-giaddr-next-hop

ip dhcp-external recreate-subscriber-interface

ip dhcp-external server-address

ip dhcp-external server-sync

ip re-authenticate-auto-detect ip-subscriber

ip route

ip route-map ip-subscriber

set ip interface-profile

service dhcp-external

Monitoring Tasks

Monitoring DHCP External Server Configuration Information

Monitoring DHCP External Server Duplicate MAC Address Setting

Monitoring DHCP External Server Statistics

Monitoring Commands

show dhcp-external

show ip dhcp-external binding

show ip dhcp-external binding-id

show ip dhcp-external configuration

show ip dhcp-external statistics

Knowledge Base

High counters in DHCP External Server statistics

Sample configuration for DHCP External with RADIUS authentication

DHCP External is not functioning properly after an ISSU

DHCP External clients cannot login due to memory exhaustion

SSCC intermittently misses COPS address requests for DHCP External DSI clients

DHCP Discover is not sent to sscClient for DHCP External clients

DHCP External bindings are stuck in deleting state after lease timer expiry

ERX DHCP External Server process does not properly handle DHCP Decline messages

ERX is duplicating multicast packets on shared DSI interface with DHCP external configuration.

DSI interfaces are not created on GRE tunnel interfaces when using DHCP External Server

SRP Reset: exception 0x68616c74 (halt), task: icc upon removing DHCP External

Overlapping (Duplicate) MAC addresses result in incomplete ERX DHCP external-server binding table

Server address for the client binding under DHCP External shows wrong address if client is moved.

The DHCP external server lease binding table sometimes does not show the interface associated with a lease binding

DHCP External server will create stale bindings for Renew/Rebind requests without an Ack from the Server

User traffic may be dropped when strict MAC validation is configured with DHCP Relay Proxy and DHCP External

DHCP External Server with DHCP Relay is not functioning if the DHCP server is accessed across an MPLS tunnel

DHCP External subscriber access-internal routes have 0.0.0.0 as the next-hop address

Next-Hop value of Access route installed as 0.0.0.0 in DHCP External Server when packet trigger enabled

ARP entry is not removed after a dhcp-external binding is deleted

sample configuration for dhcp-external and dhcp relay in a virtual router

Lease time is not updated correctly on dhcp-external server when client renews

DHCP packets cannot be monitored on the virtual router with dhcp-external server configured

DHCP-External binding information is not updated properly when a PC comes out of hibernation

SRP CPU goes to 100% utilization after issuing 'no service dhcp-external'

DHCP-External uses Option 51 in the DHCP Request packet as the lease timer if it doesn't receive an ACK.

 

Downloads

  • Broadband Access Configuration Guide, Release 13.2.0 PDF Document
  • DHCP External Server on E Series Broadband Services Routers PDF Document
 
 
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