User manual

FL SWITCH MM HS
9-2
PHOENIX CONTACT 6874_en_09
Link Layer
Discovery Protocol
Figure 9-1 "Link Layer Discovery Protocol" web page
Table 9-1 Event table for LLDP
Event Activity of the Individual
LLDP Agent
Response of the
Neighboring LLDP Agent
Activate LLDP agent or
device 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 Send 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
Interval" with the "Message Transmit Hold Multiplier". The "Message Transmit Hold
Multiplier" can only be modified via SNMP. The default value is four.