Green Ethernet Commands
735
ProSafe M4100 and M7100 Managed Switches
Energy-Detect Mode
When Energy-Detect mode is enabled, if communication on a port stops, the port circuitry
automatically shuts down for a short period. The port wakes up periodically to check for link
activity. If activity is detected, the port circuitry remains active. This allows performing
autonegotiation and saving power when there is no active link.
Note: Combination ports support both copper and fiber media. Energy
Detect mode only applies to copper media. If Energy Detect mode is
configured on a combination port, it will only function when a copper
media is active.
Energy Efficient Ethernet (EEE)
Energy Efficient Ethernet (EEE) combines MAC with ports that support operation in a
Low-Power Mode. This feature is defined by the IEEE 802.3az Energy Efficient Ethernet
Task Force. Lower Power Mode enables both send and receive sides of a link to disable
some port functionality to save power when the port is lightly loaded. Transition to
Low-Power Mode does not change the link status. Frames in transit are not dropped or
corrupted during transition to and from Low-Power Mode. This transition time is transparent
to upper layer protocols and applications.
EEE operation is subject to the following conditions:
• Autonegotiation must be enabled to use any of the EEE modes. EEE mode is disabled
automatically when autonegotiation is disabled.
• Enabling or Disabling EEE mode causes the port link to flap once as EEE capability
needs to be advertised. This restarts autonegotiation.
• EEE must be disabled while running hardware or software cable diagnostics.
• Combo (Combination) ports: Combo ports support both copper and fiber media. EEE
mode only applies to copper media. If Energy Detect mode is configured on a
combination port, it will only function when a copper media is active. EEE LPI statistics
are only collected if a copper media is used on the port. If the media on a port changes
from copper to fiber while EEE is enabled, LPI statistics collection stops until the media
changes back to copper. The show green-mode <u/s/p> and show green-mode
eee-lpi-history interface <u/s/p> commands display updated LPI statistics
only if the medium is copper.