Configuration Guide User guide

FastIron Configuration Guide 487
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LLDP-MED attributes advertised by the Brocade device
• Power sourcing device/equipment (PSE) – This is the source of the power, or the device
that integrates the power onto the network. Power sourcing devices/equipment have
embedded POE technology. In this case, the power sourcing device is the Brocade POE
device.
• Powered device (PD) – This is the Ethernet device that requires power and is situated on
the other end of the cable opposite the power sourcing device.
• Power source – The power source being utilized by a PSE or PD, for example, primary power
source, backup power source, or unknown.
For Endpoint devices, the power source information indicates the power capability of the
Network Connectivity Device it is attached to. When the Network Connectivity device
advertises that it is using its primary power source, the Endpoint should expect to have
uninterrupted access to its available power. Likewise, if the Network Connectivity device
advertises that it is using backup power, the Endpoint should not expect continuous power.
The Endpoint may additionally choose to power down non-essential subsystems or to conserve
power as long as the PSE is advertising that it is operating on backup power.
NOTE
Brocade devices always advertise the power source as “unknown”.
• Power priority – The in-line power priority level for the PSE or PD:
• 3 – low
• 2 – high
• 1 – critical
• unknown
• Power level – The total power, in tenths of watts, required by a PD from a PSE, or the total
power a PSE is capable of sourcing over a maximum length cable based on its current
configuration.
If the exact power is not known for a PSE or PD, it will advertise the power level associated with
its 802.3af power class (listed in Table 86).
For a PD (Endpoint device), the power level represents the maximum power it can consume
during normal operations in its current configuration, even if its actual power draw at that
instance is less than the advertised power draw.
For a PSE (Network Connectivity device), the power level represents the amount of power that
is available on the port at the time. If the PSE is operating in reduced power (i.e., it is using
backup power), the reduced power capacity is advertised as long as the condition persists.
By default, LLDP-MED power-via-MDI information is automatically advertised when LLDP-MED is
enabled, the port is a POE port, and POE is enabled on the port. To disable this advertisement,
enter a command such as the following.
TABLE 86 802.3af power classes
Power class Minimum power level output at the PSE Maximum power levels at the PD
0 15.4 watts 0.44 – 12.95 watts
1 4.0 watts 0.44 – 3.84 watts
2 7.0 watts 3.84 – 6.49 watts
3 15.4 watts 6.49 – 12.95 watts