Dhcp Liveness Detection - Juniper EX3400 Features Manual

DHCP and Other System Services Feature Guide for EX2300, EX3400, and EX4300 Switches

DHCP Liveness Detection

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pass through the router (or switch) to determine when the lease for this client has
expired or been released. This process is referred to as lease shadowing or passive
snooping.
Liveness detection for DHCP subscriber or DHCP client IP sessions utilizes an active
liveness detection protocol to institute liveness detection checks for relevant clients.
Clients are expected to respond to liveness detection requests within a specified amount
of time. If the responses are not received within that time for a given number of
consecutive attempts, then the liveness detection check fails and a failure action is
implemented.
NOTE: DHCP liveness detection either globally or per DHCP group.
DHCPv6 Relay Agent Overview on page 85
Access and Access-Internal Routes for Subscriber Management
Dynamic Profile Attachment to DHCP Subscriber Interfaces Overview
Using External AAA Authentication Services with DHCP on page 101
DHCP Relay Proxy Overview on page 51
Graceful Routing Engine Switchover for DHCP
High Availability Using Unified ISSU in the PPP Access Network
Verifying and Managing DHCP Relay Configuration on page 81
Tracing Extended DHCP Operations
Example: Minimum DHCP Relay Agent Configuration on page 50
Example: DHCP Relay Agent Configuration with Multiple Clients and Servers
Example: Configuring DHCP Relay Agent Selective Traffic Processing Based on DHCP
Option Strings on page 53
Example: Configuring DHCP and DHCPv6 Relay Agent Group-Level Selective Traffic
Processing
Example: Configuring a DHCP Firewall Filter to Protect the Routing Engine
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