Verifying And Managing Dhcp Relay Configuration - Juniper EX3400 Features Manual

Verifying and Managing DHCP Relay Configuration

Purpose
Action
Related
Documentation
Suppressing DHCP Access, Access-Internal, and Destination Routes
Copyright © 2017, Juniper Networks, Inc.
View or clear address bindings or statistics for extended DHCP relay agent clients:
To display the address bindings for extended DHCP relay agent clients:
user@host> show dhcp relay binding
To display extended DHCP relay agent statistics:
user@host> show dhcp relay statistics
To clear the binding state of DHCP relay agent clients:
user@host> clear dhcp relay binding
To clear all extended DHCP relay agent statistics:
user@host> clear dhcp relay statistics
CLI Explorer
During the DHCP client binding operation, the DHCP process adds route information for
the DHCP sessions by default. The DHCP process adds access-internal and destination
routes for DHCPv4 sessions, and access-internal and access routes for DHCPv6 sessions.
In some scenarios, you might want to override the default behavior and prevent DHCP
from automatically installing the route information. For example, DHCP relay installs
destination (host) routes by default—this action is required in certain configurations to
enable address renewals from the DHCP server to work properly. However, the default
installation of destination routes might cause a conflict when you configure DHCP relay
with static subscriber interfaces. To avoid such configuration conflicts you can override
the default behavior and prevent DHCP relay from installing the routes.
NOTE: You cannot suppress access-internal routes when the subscriber is
configured with both IA_NA and IA_PD addresses over IP demux
interfaces—the IA_PD route relies on the IA_NA route for next hop connectivity.
You can configure both DHCP local server and DHCP relay agent to override the default
route installation behavior, and you can specify the override for both DHCPv4 and DHCPv6
sessions. You can override the route installation globally or for named interface groups.
For DHCPv4 you can override the installation of destination routes only or access-internal
routes (the access-internal option prevents installation of both destination and
access-internal routes). For DHCPv6 you can specify access routes, access-internal
routes, or both.
Chapter 4: DHCP Relay Agent
routing-instance customer routing instance
routing-instance customer routing instance
routing-instance customer routing instance
routing-instance customer routing instance
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