Lantronix SISPM1040-3166-L Web User Guide Rev G PDF 14.13 MB - Page 42
LLDP Neighbor EEE
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Transition Networks SISPM1040-3xxx-L Web User Guide 3-4.6 LLDP Neighbor EEE By using Energy Efficient Ethernet, power savings can be achieved at the expense of traffic latency. This latency occurs due to the fact 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 on the minimum wakeup time they need. This page provides an overview of EEE information exchanged by LLDP. To show LLDP neighbor EEE: 1. Click System, LLDP, and LLDP Neighbor EEE. 2. Click Refresh to immediately update the page. 3. Click Auto-refresh to automatically update the web page. Figure 3-4.6: LLDP Neighbors EEE information Parameter descriptions: Local Port : The interface at which LLDP frames are received or transmitted. Tx Tw : The link partner's maximum time that transmit path can hold-off sending data after deassertion of LPI. Rx Tw : The link partner's time that receiver would like the transmitter to hold-off to allow time for the receiver to wake from sleep. Fallback Receive Tw : 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. Echo Tx Tw : The link partner's Echo Tx Tw value. The respective echo values is defined as the local link partner's 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. Echo Rx Tw : The link partner's Echo Rx Tw value. 33763 Rev. G https://www.transition.com Page 42 of 496