Supported Platforms
Example: Configuring PoE Interfaces on an EX Series Switch
Power over Ethernet (PoE) ports supply electric power over the same ports that are used to connect network devices and allow you to plug in devices that require both network connectivity and electric power, such as voice over IP (VoIP) phones, wireless access points, and some IP cameras.
You do not need to configure PoE unless you wish to modify the default values or disable PoE on a specific interface.
This example describes a default configuration of PoE interfaces on an EX Series switch:
Requirements
This example uses the following software and hardware components:
- Junos OS Release 9.0 or later for EX Series switches
- One EX Series switch that supports PoE
Before you configure PoE, be sure you have:
- Performed the initial switch configuration. See Connecting and Configuring an EX Series Switch (CLI Procedure) or Connecting and Configuring an EX Series Switch (J-Web Procedure) for details.
Overview and Topology
The topology used in this example consists of a switch that has 24 ports. Eight of the ports support PoE (IEEE 802.3af), which means they provide both network connectivity and electric power for powered devices such as VoIP telephones, wireless access points, and IP security cameras that require 12.95 W or less. The remaining 16 ports provide only network connectivity. You use the standard ports to connect devices that have their own power sources, such as desktop and laptop computers, printers, and servers. Table 1 details the topology used in this configuration example.
Table 1: Components of the PoE Configuration Topology
| Property | Settings |
|---|---|
Switch hardware | EX Series switch with 24 Gigabit Ethernet ports: 8 PoE interfaces (ge-0/0/0 through ge-0/0/7) and 16 non-PoE interfaces (ge-0/0/8 through ge-0/0/23) |
VLAN name | default |
Connection to a wireless access point (requires PoE) | ge-0/0/0 |
Connections to Avaya IP telephones with integrated hubs that allow phone and desktop PC to connect to a single port (requires PoE) | ge-0/0/1 through ge-0/0/7 |
Direct connections to desktop PCs, file servers, integrated printer/fax/copier machines (no PoE required) | ge-0/0/8 through ge-0/0/20 |
Unused ports (for future expansion) | ge-0/0/21 through ge-0/0/23 |
Configuration
To enable the default PoE configuration on the switch:
CLI Quick Configuration
To quickly enable the default configuration on the switch:
Simply connect the powered devices to the PoE ports.
Step-by-Step Procedure
To use the PoE interfaces with default values:
- Make sure the switch is powered on.
- Connect the wireless access point to interface ge-0/0/0.
- Connect the Avaya phones to interfaces ge-0/0/1 through ge-0/0/7.
Verification
To verify that PoE interfaces have been created and are operational, perform this task:
Verifying That the PoE Interfaces Have Been Created
Purpose
Verify that the PoE interfaces have been created on the switch.
Action
List all the PoE interfaces configured on the switch:
user@switch> show poe interfaceInterface Admin Oper Max Priority Power Class
status status power consumption
ge-0/0/0 Enabled ON 15.4W Low 7.9W 0
ge-0/0/1 Enabled ON 15.4W Low 3.2W 2
ge-0/0/2 Enabled ON 15.4W Low 3.2W 2
ge-0/0/3 Enabled ON 15.4W Low 3.2W 2
ge-0/0/4 Enabled ON 15.4W Low 3.2W 2
ge-0/0/5 Enabled ON 15.4W Low 3.2W 2
ge-0/0/6 Enabled ON 15.4W Low 3.2W 2
ge-0/0/7 Enabled ON 15.4W Low 3.2W 2
Meaning
The show poe interface command lists PoE interfaces configured on the switch, with their status, priority, power consumption, and class. This output shows that eight interfaces have been created with default values and are consuming power at the expected rates.
