Chapter 41 Auto PD Recovery
GS2220 Series User’s Guide
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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 Ne ig hbo r
field.
The default setting for Po lling Inte rva l (20 secs) and Po lling Co unt (3 times) will cause the Switch to ping
the PD status every 20 seconds. If there is no ping reply from the PD, Po lling Co unt starts to count from 1.
Once Po lling Co unt reaches 3, the Switch will cause a Re b oot- Ala rm on the PD as selected in Ac tio n.
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 Sta tus > Ne ig hbor
screen.
Once the LLDP table’s counter reaches the default 120 seconds, the Switch will cause a Re bo o t- Ala rm
on the PD as selected in Ac tio n.
4 After sending an SNMP trap and generating a log message, the connected PD will restart (the
connecting port is detected as link-down).
When restarting, the PD entry disappears from the Switch’s LLDP table and the PD He a lth status LED will
turn to yellow in the Sta tus > Ne ig hb o r screen.
The Switch will restore power to the PD based on your value for Re sum e Powe r Inte rva l.
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 Re sume Po lling Inte rva l.
When the PD Re bo o t C ount value is reached, the Switch will no longer perform the PD recovery process.
The PD He a lth status LED will turn to red in the Sta tus > Ne ig hbo r screen.
5 Click Apply to save your changes back to the run-time memory.
6 Click the Sa ve link in the upper right corner of the Web Configurator to save your configuration
permanently.
Note: In the event of a PD performing firmware upgrade, the PD may stop responding to ping
or fail to provide LLDP packets for an extended period of time. When the Switch resets
power to the PD before firmware upgrade is finished, it may permanently damage the
PD or require a hard reset to recover it. It is stro ng ly a dvise d to disa b le the Switc h's Auto
PD Re c o ve ry func tio n b e fo re upg ra ding the PD's firm wa re . This will pre ve nt da m a g e
c a use d by a po we r c uto ff.
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