Default: Disabled
Example:
You can enter this command to enable LLDP detection:
switch(config) # int A7 poe-lldp-detect enabled
or in interface context:
switch(eth-A7) # poe-lldp-detect enabled
For more information on PoE/PoE+ and LLDP, see PoE/PoE+ allocation using LLDP information on page 93.
Enabling PoE detection via LLDP TLV advertisement
Use this command and insert the desired port or ports:
switch(config) # lldp config <port-number> medTlvenable poe
For more information on LLDP, see
PoE/PoE+ allocation using LLDP information on page 93.
LLDP with PoE+
Overview
The DLC for PoE provides more exact control over the power requirement between a PSE and PD. The DLC
works in conjunction with the PLC and is mandatory for any Type-2 PD that requires more than 12.95 watts of
input power.
NOTE:
DLC is defined as part of the IEEE 802.3at standard.
You can implement the power negotiation between a PSE and a PD at the physical layer or at the data link layer.
After the link is powered at the physical layer, the PSE can use LLDP to query the PD repeatedly to discover the
power needs of the PD. Communication over the data link layer allows finer control of power allotment, which
makes it possible for the PSE to supply dynamically the power levels needed by the PD. Using LLDP is optional
for the PSE but mandatory for a Type 2 PD that requires more than 12.95 watts of power.
If the power needed by the PD is not available, that port is shut off.
PoE allocation
There are two ways LLDP can negotiate power with a PD:
• Using LLDP MED TLVs
Disabled by default. Can be enabled using the int <port-list> PoE-lldp-detect [enable|
disable] command, as shown below.LLDP MED TLVs sent by the PD are used to negotiate power only if
the LLDP PoE+ TLV is disabled or inactive; if the LLDP PoE+ TLV is sent as well (not likely), the LLDP MED
TLV is ignored.
• Using LLDP PoE+ TLVs
Enabled by default. The LLDP PoE+ TLV is always advertised unless it has been disabled (enable it by using
the lldp config <port-list> dot3TlvEnable poe_config command.)For the Command syntax,
see
Initiating advertisement of PoE+ TLVs on page 95. It always takes precedence over the LLDP MED
TLV.
Enabling PoE-lldp-detect allows the data link layer to be used for power negotiation. When a PD requests
power on a PoE port, LLDP interacts with PoE to see if there is enough power to fulfill the request. Power is set at
94 Aruba 2530 Management and Configuration Guide for
ArubaOS-Switch 16.05
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