802.3az is also known as Energy-Efficient Ethernet. It is a set of enhancements to the Ethernet standard that allow for less power consumption during periods of low data activity. It was ratified in 2010 by the IEEE.
Note: Green Ethernet was the name given to energy saving saving techniques released by some vendors before 802.az was ratified.
1. Both Ends must e 802.3az capable.
2. It uses LPI ( low power idle ) to tell the other end that there is no data to be sent and device can be put in "sleep mode" to conserve power.
3. When one has a data to send, it will let the other party know by sending Normal Idle signal to let the other end know that there is data to be sent.
Environment : In Aruba, 802.3az is supported for
a. AP 130 series and above
b. Aruba os 6.2 and above
Network Topology :
Aruba APs coming up on POE.
Code 6.2 and above.
Aruba AP 130 series and above.
Both the ends must support this capability.
# config t
#ap enet-link-profile az-enabled
# ap wired-port-profile az-enabled
# enet0-port-profile az-enabled
APs which do not support this feature will will ignore this setting without any effect on the connectivity.
Wikiipedia page: http://en.wikipedia.org/wiki/Energy-Efficient_Ethe