Juniper EX3400 Features Guide

Configuring a Token for DHCP Local Server Authentication . . . . . . . . . . . . . . . . . . 31
Centrally Configured Opaque DHCP Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Data Flow for RADIUS-Sourced DHCP Options . . . . . . . . . . . . . . . . . . . . . . . 34
Multiple VSA 26-55 Instances Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 35
DHCP Options That Cannot Be Centrally Configured . . . . . . . . . . . . . . . . . . . 35
Port Number Requirements for DHCP Firewall Filters . . . . . . . . . . . . . . . . . . . . . . 36
Verifying and Managing DHCP Local Server Configuration . . . . . . . . . . . . . . . . . . . 37
Chapter 3 DHCPv6 Local Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
DHCPv6 Local Server Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Enabling DHCPv6 Rapid Commit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Specifying the Delegated Address Pool for IPv6 Prefix Assignment . . . . . . . . . . . 42
Preventing Binding of Clients That Do Not Support Reconfigure Messages . . . . . 42
Verifying and Managing DHCPv6 Local Server Configuration . . . . . . . . . . . . . . . . 43
Chapter 4 DHCP Relay Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Extended DHCP Relay Agent Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Interaction Among the DHCP Relay Agent, DHCP Client, and DHCP
Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
DHCP Liveness Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Configuring an Extended DHCP Relay Server on EX Series Switches (CLI
Procedure) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Example: Minimum DHCP Relay Agent Configuration . . . . . . . . . . . . . . . . . . . . . . 50
DHCP Relay Proxy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Interaction Among DHCP Relay Proxy, DHCP Client, and DHCP Servers . . . . 51
Enabling DHCP Relay Proxy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Example: Configuring DHCP Relay Agent Selective Traffic Processing Based on
DHCP Option Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Using Layer 2 Unicast Transmission for DHCP Packets . . . . . . . . . . . . . . . . . . . . . 58
Sending Release Messages When Clients Are Deleted . . . . . . . . . . . . . . . . . . . . . 58
Disabling Automatic Binding of Stray DHCP Requests . . . . . . . . . . . . . . . . . . . . . 59
Using DHCP Relay Agent Option 82 Information . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Configuring Option 82 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Including a Prefix in DHCP Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Including a Textual Description in DHCP Options . . . . . . . . . . . . . . . . . . . . . . 65
Trusting Option 82 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Overriding the Default DHCP Relay Configuration Settings . . . . . . . . . . . . . . . . . . 68
Overriding Option 82 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Changing the Gateway IP Address (giaddr) Field to the giaddr of the DHCP Relay
Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Replacing the DHCP Relay Request and Release Packet Source Address . . . . . . . 72
Enabling and Disabling DHCP Snooped Packets Support for DHCP Relay
Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Configuring DHCP Snooped Packets Forwarding Support for DHCP Relay
Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Configuring Named Server Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Configuring Active Server Groups to Apply a Common DHCP Relay Agent
Configuration to Named Server Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Disabling DHCP Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Verifying and Managing DHCP Relay Configuration . . . . . . . . . . . . . . . . . . . . . . . . 81
Copyright © 2017, Juniper Networks, Inc.iv
DHCP and Other System Services Feature Guide for EX2300, EX3400, and EX4300 Switches

Juniper EX3400 Specifications

General

Switch type	Managed
Switch layer	L2/L3
Quality of Service (QoS) support	Yes
Safety	UL-UL60950-1, C-UL CAN/CSA 22.2 No.60950-1, TUV/GS to EN 60950-1, CB-IEC60950-1, EN 60825-1
Form factor	1U
Product color	Black
Electromagnetic compatibility	FCC 47CFR 15 A, EN 55022 A, ICES-003 A, VCCI A, AS/NZS CISPR 22 A, CISPR 22 A, EN 55024, EN 300386, CE
SFP+ module slots quantity	4
QSFP+ module slots quantity	2
Installed SFP+ modules quantity	0
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	48
Memory type	DRAM
Noise level	35 dB
Flash memory	2000 MB
Processor frequency	1000 MHz
Virtual stacking (units)	10
Throughput	250 Mpps
Jumbo frames	9216
MAC address table	32000 entries
Number of VLANs	4093
Networking standards	IEEE 802.1D, IEEE 802.1Q, IEEE 802.1ab, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ae, IEEE 802.3u, IEEE 802.3z
Virtual LAN features	Port-based VLAN
Copper ethernet cabling technology	10BASE-T, 100BASE-T, 1000BASE-T
Power consumption (max)	120 W
Number of power supply units	1
Operating altitude	0 - 3048 m
Non-operating altitude	3048 - 4877 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 45 °C
Storage relative humidity (H-H)	0 - 95 %
Operating relative humidity (H-H)	10 - 85 %
DHCP features	DHCP server, DHCP client
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, HTTPS, SNMP, SSH-2
Fiber ethernet cabling technology	1000BASE-X

Weight and Dimensions

Depth	350 mm
Width	437 mm
Height	44 mm
Weight	5740 g