Table of Contents
Advertisement
Linksys
Linksys
LLDP is used to select the optimal set of parameters for both devices If LLDP
is not supported by the link partner, or is disabled, 802 3 EEE will still be
operational, but it might not be in the optimal operational mode
The 802 3 EEE feature is implemented using a port mode called Low Power
Idle (LPI) mode When there is no traffic and this feature is enabled on the
port, the port is placed in the LPI mode, which reduces power consumption
dramatically
Both sides of a connection (device port and connecting device) must support
802 3 EEE for it to work When traffic is absent, both sides send signals
indicating that power is about to be reduced When signals f s (and not in
Down status), and power is reduced
For ports to stay in LPI mode, the Keep Alive signal must be received
continuously from both sides
Power Saving by Disabling Port LEDs
The Disable Port LEDs feature saves power consumed by the device's LEDs
When located in an unoccupied room, these LEDs are unnecessary Use the
Green Ethernet feature to disable port LEDs (link, speed, and PoE) when they
are not needed Enable them if needed (debugging, connecting additional
devices, etc )
Advertise Capabilities Negotiation
802 3 EEE support is advertised during the Auto-Negotiation stage Auto-
Negotiation provides a linked device with the capability to detect the
abilities (modes of operation) supported by the device at the other end of
the link, determine common abilities, and configure itself for joint operation
Auto-Negotiation is performed at the time of link-up, on command from
management, or upon detection of a link error During the link establishment
process, both link partners to exchange their 802 3 EEE capabilities Auto-
Negotiation functions automatically without user interaction when it is
enabled on the device
NOTE:
If Auto-Negotiation is not enabled on a port, the EEE is disabled The only
exception is if the link speed is 1GB, then EEE will still be enabled even
though Auto-Negotiation is disabled
Default Configuration
By default, 802 3 EEE is enabled globally and per port
•
Interactions Between Features
The following describe 802 3 EEE interactions with other features:
If auto-negotiation is not enabled on the port, the 802 3 EEE operational
•
status is disabled The exception to this rule is that if the link speed is 1
gigabit, EEE will still be enabled even though Auto-Negotiation is disabled
If 802 3 EEE is enabled and the port is going up, it commences to work
•
immediately in accordance with the maximum wake time value of the port
On the GUI, the EEE field for the port is not available when the Short
•
Reach Mode option on the port is checked
If the port speed on the GE port is changed to 10Mbit, 802 3 EEE is disabled
This is supported in GE models only
802.3 EEE Configuration Workflow
This section describes how to configure the 802 3 EEE feature and view its
counters
STEP 1 Ensure that auto-negotiation is enabled on the port by opening the
Ports page
a
Select a port and open the Edit Ports page
b
Select Auto Negotiation field to ensure that it is Enabled
STEP 2 Ensure that 802 3 Energy Efficient Ethernet (EEE) is globally enabled
in the Green Ethernet page (it is enabled by default) This page also
displays how much energy has been saved
STEP 3 Ensure that 802 3 EEE is enabled on a port by opening the Green
Ethernet page
a
Select a port, open the Edit Ports page
b
Check the 802 3 Energy Efficient Ethernet (EEE) mode on the port (it is
enabled by default)
Configuring Green Ethernet
To configure Green Ethernet globally and on a port, do the following:
STEP 1 Click Configuration > Port Management > Green Ethernet
STEP 2 Choose whether to enable the following features:
Energy Detect Mode—Select to globally enable
•
Table of Contents
Table of Contents
28
28
Advertisement
Table of Contents
