Users Guide

• Power Source — there are two possible power sources: primary and backup. The Dell Networking system is a primary power
source, which corresponds to a value of 1, based on the TIA-1057 specication.
• Power Priority — there are three possible priorities: Low, High, and Critical. On Dell Networking systems, the default power
priority is High, which corresponds to a value of 2 based on the TIA-1057 specication. You can congure a dierent power
priority through the CLI. Dell Networking also honors the power priority value the powered device sends; however, the CLI
conguration takes precedence.
• Power Value — Dell Networking advertises the maximum amount of power that can be supplied on the port. By default the
power is 15.4W, which corresponds to a power value of 130, based on the TIA-1057 specication. You can advertise a dierent
power value using the max-milliwatts option with the power inline auto | static command. Dell Networking also
honors the power value (power requirement) the powered device sends when the port is congured for power inline
auto.
Figure 26. Extended Power via MDI TLV
LLDP Operation
On an Aggregator, LLDP operates as follows:
• LLDP is enabled by default.
• LLDPDUs are transmitted and received by default. LLDPDUs are transmitted periodically. The default interval is 30 seconds.
• LLDPDU information received from a neighbor expires after the default Time to Live (TTL) value: 120 seconds.
• Dell Networking OS supports up to eight neighbors per interface.
• Dell Networking OS supports a maximum of 8000 total neighbors per system. If the number of interfaces multiplied by eight
exceeds the maximum, the system does not congure more than 8000.
• LLDP is not hitless.
Viewing the LLDP Conguration
To view the LLDP conguration, use the following command.
• Display the LLDP conguration.
CONFIGURATION or INTERFACE mode
show config
Example of Viewing LLDP Global Congurations
R1(conf)#protocol lldp
R1(conf-lldp)#show config
!
protocol lldp
advertise dot3-tlv max-frame-size
advertise management-tlv system-capabilities system-description
hello 10
no disable
R1(conf-lldp)#
Example of Viewing LLDP Interface Congurations
R1(conf-lldp)#exit
R1(conf)#interface tengigabitethernet 0/3
R1(conf-if-te-0/3)#show config
!
interface tengigabitEthernet 0/3
switchport
148
Link Layer Discovery Protocol (LLDP)