
© 2012 Cisco and/or its affiliates. All rights reserved.
Presentation_ID
Cisco Public
© 2013 Cisco and/or its affiliates. All rights reserved.
BRKARC-3470 Cisco Public
25
PHY
Energy Efficient Ethernet (IEEE 802.3az)
• IEEE standard for reducing power consumption during idle periods
• Auto-negotiated at Layer 1, like speed and duplex
• Introduces Low Power Idle (LPI) mode for Ethernet ports
‒ Systems on both ends of link save power in LPI mode
‒ Transparent to upper layer protocols
10G MAC 10G MAC
EEE-capable partner EEE-capable port
EEE Buffer
PHY
Auto-negotiate EEE
Normal traffic flow
Count idles
Idles threshold crossed
Signal LPI mode
Enter LPI mode Enter LPI mode
Non-idle character
detected
Send wake signal
Buffer packets
Wake up Wake up
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