Port Management
Green Ethernet
Cisco Small Business 300 Series Managed Switch Administration Guide 97
9
Green Ethernet
Green Ethernet is a common name for a set of features that are designed to be
environmentally friendly, and to reduce the power consumption of a device.
The Green Ethernet feature reduces overall power usage in two ways:
• Energy-Detect Mode—On an inactive link, the port moves into inactive
mode, saving power while keeping the Administrative status of the port Up.
Recovery from this mode to full operational mode is fast, transparent, and no
frames are lost. This mode is supported on both GE and FE ports.
• Short-Reach Mode—Cable length is analyzed, and the power usage is
adjusted for various cable lengths. In this mode, the VCT (Virtual Cable
Tester) length test is performed to measure cable length. If the cable is
shorter than a predetermined length, the switch uses less power to send
frames over the cable, thus saving energy. This mode is only supported on
RJ45 GE ports; it does not apply to the GE ports with the Combo Port.
The two Green Ethernet modes: Energy Detect Mode and Short Reach Mode must
be enabled globally and configured per port.
Power savings and current power consumption can be monitored. The total
amount of saved energy can be viewed as a percentage of the power that would
have been consumed by the physical interfaces had they not been running in
Green Ethernet mode.
Power savings can be monitored.
The Green Ethernet features are defined per port, regardless of their LAG
membership.
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