Reference Guide

174 | Link Layer Discovery Protocol (LLDP)
www.dell.com | support.dell.com
Figure 14-5. LLDP-MED Policies TLV
Extended Power via MDI TLV
The Extended Power via MDI TLV enables advanced power over ethernet (PoE) management between
LLDP-MED endpoints and network connectivity devices (Figure 14-6). Advertise the Extended Power via
MDI on all ports that are connected to an 802.3af powered, LLDP-MED endpoint device.
• Power Type—there are two possible power types: power sourcing entity (PSE) or power device (PD).
The Dell Force10 system is a PSE, which corresponds to a value of 0, based on the TIA-1057
specification.
• Power Source—there are two possible power sources: Primary and Backup. The Dell Force10 system
is a Primary Power Source, which corresponds to a value of 1, based on the TIA-1057 specification.
• Power Priority—there are three possible priorities: Low, High, and Critical. On Dell Force10
systems, the default power priority is High, which corresponds to a value of 2 based on the TIA-1057
specification. You can configure a different power priority through the CLI. Dell Force10 also honors
the power priority value sent by the powered device. However, the CLI configuration takes
precedence.
• Power Value—Dell Force10 advertises the maximum amount of power that can be supplied on the
port. By default it is 15.4W, which corresponds to a Power Value of 130, based on the TIA-1057
specification. You can advertise a different Power Value using the
max-milliwatts option with the power
inline auto
| static command. Dell Force10 also honors the power value (power requirement) sent by the
powered device when the port is configured for
power inline auto.
Figure 14-6. Extended Power via MDI TLV
TLV Type
(127)
TLV Length
(8)
Organizationally
Unique ID
(00-12-BB)
Organizationally
Defined Sub-type
(2)
Application Type
(0-255)
7 bits
9 bits
3 octets
1 octet
U
3 bits
1 octet
T
X
(0)
12 bits
VLAN ID
(0-4095)
L2 Priority
(0-7)
DSCP Value
(0-63)
3 bits 6 bits
TLV Type
(127)
TLV Length
(7)
Organizationally
Unique ID
(00-12-BB)
Organizationally
Defined Sub-type
(4)
Power Type
(0)
fnC0056m
p
7 bits
9 bits
3 octets
1 octet
2 bits
4 bits
Power Source
(1)
Power Priority
(2)
2 octets
Power Value
(130)
2 bits