Port Management
Configuring Green Ethernet
Cisco 500 Series Stackable Managed Switch Administration Guide 196
10
Power Saving by Disabling Port LEDs
The Disable Port LEDs feature saves power consumed by device LEDs. Since the
devices are often in an unoccupied room, having these LEDs lit is a waste of
energy. The Green Ethernet feature enables you to disable the port LEDs (for link,
speed, and PoE) when they are not required, and to enable the LEDs if they are
needed (debugging, connecting additional devices etc.).
On the System Summary page, the LEDs that are displayed on the device board
pictures are not affected by disabling the LEDs.
Port LEDs can be disabled on the Green Ethernet -> Properties page.
802.3az Energy Efficient Ethernet Feature
This section describes the 802.3az Energy Efficient Ethernet (EEE) feature.
It covers the following topics:
• 802.3az EEE Overview
• Advertise Capabilities Negotiation
• Link Level Discovery for 802.3az EEE
• Availability of 802.3az EEE
• Default Configuration
• Interactions Between Features
• 802.3az EEE Configuration Workflow
802.3az EEE Overview
802.3az EEE is designed to save power when there is no traffic on the link. In
Green Ethernet, power is reduced when the port is down. With 802.3az EEE,
power is reduced when the port is up, but there is no traffic on it.
802.3az EEE is only supported on devices with GE ports.
When using 802.3az EEE, systems on both sides of the link can disable portions of
their functionality and save power during periods of no traffic.
802.3az EEE supports IEEE 802.3 MAC operation at 100 Mbps and 1000 Mbps:
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