ZyXEL Communications GS1350 Series User Manual page 233

Figure 170 Auto PD Recovery (LLDP Mode)
Select the desired ports in the Active column.
2
Select the Mode.
3
When you select Ping, the connected PD's IPv4 or IPv6 address to which the Switch sends ping requests
will display automatically if the PD supports LLDP. If not, enter the IP address of the PDs in the Neighbor
field.
The default setting for Polling Interval (20 secs) and Polling Count (3 times) will cause the Switch to ping
the PD status every 20 seconds. If there is no ping reply from the PD, Polling Count starts to count from 1.
Once Polling Count reaches 3, the Switch will cause a Reboot-Alarm on the PD as selected in Action.
When you select LLDP, the Switch monitors the PD status by checking incoming LLDP packets every 30
seconds from the PD (default value of transmit interval for LLDP feature).
Likewise, the Switch sends out LLDP packets to the PD every 30 seconds to update the Status > Neighbor
screen (see Section 7.2.1 on page 84
Once the LLDP table's counter reaches the default 120 seconds, the Switch will cause a Reboot-Alarm
on the PD as selected in Action.
After sending an SNMP trap and generating a log message, the connected PD will restart (the
4
connecting port is detected as link-down).
When restarting, the PD entry disappears from the Switch's LLDP table and the PD Health status LED will
turn to yellow in the Status > Neighbor screen.
The Switch will restore power to the PD based on your value for Resume Power Interval.
After the PD is powered on, the Switch resumes detection of the PD status by performing ping requests
or checking the LLDP table based on your value for Resume Polling Interval.
When the PD Reboot Count value is reached, the Switch will no longer perform the PD recovery process.
The PD Health status LED will turn to red in the Status > Neighbor screen.
Chapter 28 Auto PD Recovery
for details).
GS1350 Series User's Guide
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