Phoenix Contact 2700290, User Manual, Page: 140 / 154

Smart Managed Compact Switch
164
PHOENIX CONTACT 8089_en_03
Link Layer Discovery Pro-
tocol
Figure 10-1 “Link Layer Discovery Protocol” web page
Table 10-1 Event table for LLDP
Event Activity of the individual
LLDP agent
Response of the neigh-
boring LLDP agent
Activate LLDP agent or de-
vice startup
Transmit LLDP BPDUs to all
ports
Include sender in the list of
neighbors
Deactivate LLDP agent or
software reset
Transmit LLDP BPDUs with
a TTL value of 0 seconds to
all ports
Delete sender from the list
of neighbors
Link up Transmit port-specific LLDP
BPDUs
Include sender in the list of
neighbors
Link down Delete all neighbors for this
port
-
Timer (Message Transmit
Interval)
Cyclic transmission of
BPDUs to all ports
Update information
Aging (Time To Live) Delete neighbor information -
Receiving a BPDU from a
new neighbor
Extend list of neighbors and
respond with port-specific
BPDU
Include sender in the list of
neighbors
The “Message Time To Live” is determined by multiplying the “Message Transmit Inter-
val” with the “Message Transmit Hold Multiplier”. The “Message Transmit Hold Multiplier”
can only be modified via SNMP. The default value is four.