FL SWITCH MM HS
10-2
PHOENIX CONTACT
6874_en_16
Link Layer
Discovery Protocol
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
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.
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