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LLDP | EEE
LLDP | EEE
By using EEE power savings can be achieved at the expense of traffic latency. This latency occurs due to that
the circuits EEE turn off to save power, need time to boot up before sending traffic over the link. This time is
called wakeup time. To achieve minimal latency, devices can use LLDP to exchange information about their
respective tx and rx wakeup time , as a way to agree upon the minimum wakeup time they need.
This page provides an overview of EEE information exchanged by LLDP.
Item
Local Port
Tx Tw
Rx Tw
Fallback Receive
Tw
Echo Tx Tw
Echo Rx Tw
242 - Monitor Pages
The port on which LLDP frames are received or transmitted.
The link partner's maximum time that transmit path can hold-off sending data
after deassertion of LPI.
The link partner's time that receiver would like the transmitter to hold-off to allow
time for the receiver to wake from sleep.
The link partner's fallback receive Tw.
A receiving link partner may inform the transmitter of an alternate desired
Tw_sys_tx. Since a receiving link partner is likely to have discrete levels for savings,
this provides the transmitter with additional information that it may use for a more
efficient allocation.
Systems that do not implement this option default the value to be the same as that
of the Receive Tw_sys_tx.
The link partner's Echo Tx Tw value.
The respective echo values shall be defined as the local link partners reflection
(echo) of the remote link partners respective values. When a local link partner
receives its echoed values from the remote link partner it can determine whether or
not the remote link partner has received, registered and processed its most recent
values.
For example, if the local link partner receives echoed parameters that do not match
the values in its local MIB, then the local link partner infers that the remote link
partners request was based on stale information.
The link partner's Echo Rx Tw value.
Monitor | LLDP | EEE
RocketLinx MP1204-XT User Guide: 2000644 Rev. A
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