09-12-2012 09:55 PM
Hi Everyone,
I searched on Google for this unique behavior I discovered on a pair of SG300-28P.
On a second switch (ver 1.2.7.76) when I unplugged the power cord, to my amazement the switch turned right back on (about 1 second later), with the power cord removed. To verify that the power is indeed coming from POE, the upstream switch (ver 1.1.2.0) that is the same model (sg-300-28p), shows all 7 Ethernet ports connecting the two drawing from 2700mW, to 3000mW.
While the second switch is powered from the first over POE, the POE does not work on the second switch to power anything, and the system summary mentions something about "PoE Power Information on Master Unit".
What kind of mode is this?
Is this a stacking operation, and is POE on the second switch NOT supposed to work when powered over Ethernet from an upstream switch?
Thanks!
Jarrett
09-12-2012 10:59 PM
Hi Jarret, can you make a diagram how you are interconnecting these units? Additionally, can you take a digital photo showing the switch powered while capturing the power cord unplugged? Please post a show power inline for each unit as well.
09-13-2012 01:50 AM
Hi Thomas,
Thank you for your response, here is a small diagram of the connection between the two switches.
[GBE 3-1– SG-300-28P]
| - From Ports 1, 4, 5, 7, 8, 11, 16
|
| - (Trunk)
| - To Ports 1-4, 16-18
[GBE 4-1– SG-300-28P]
The show power inline output on both switches:
GBE3-1
Port based power-limit mode
Unit Power Nominal Power Consumed Power Usage Threshold Traps
---- ------- ------------- ------------------ --------------- ---------
1 On 180 Watts 81 Watts (45%) 95 Disable
Port Powered Device State Status Priority Class
-------- -------------------- ---------------- ------------ -------- ---------
gi1 Auto On low class0
gi2 Auto Searching low class0
gi3 Auto Searching low class0
gi4 Auto On low class0
gi5 Auto On low class0
gi6 Auto Searching low class0
gi7 Auto On low class0
gi8 Auto On low class0
gi9 Auto Searching low class0
gi10 Auto On low class3
gi11 Auto On low class0
gi12 Auto On low class3
gi13 Auto On low class0
gi14 Auto On low class0
gi15 Auto On low class3
gi16 Auto On low class0
gi17 Auto Searching low class0
gi18 Auto On low class0
gi19 Auto On low class0
gi20 Auto Searching low class0
gi21 Auto Searching low class0
gi22 Auto Searching low class0
gi23 Auto Searching low class0
gi24 Auto On low class0
GBE4-1
Port based power-limit mode
Unit Power Nominal Power Consumed Power Usage Threshold Traps
---- ------- ------------- ------------------ --------------- ---------
1 On 180 Watts 0 Watts (0%) 95 Disable
Port Powered Device State Status Priority Class
-------- -------------------- ---------------- ------------ -------- ---------
gi1 Auto Fault low class3
gi2 Auto Fault low class3
gi3 Auto Fault low class3
gi4 Auto Fault low class3
gi5 Auto Fault low class3
gi6 Auto Fault low class3
gi7 Auto Fault low class3
gi8 Auto Fault low class3
gi9 Auto Fault low class3
gi10 Auto Fault low class3
gi11 Auto Fault low class3
gi12 Auto Fault low class3
gi13 Auto Fault low class3
gi14 Auto Fault low class3
gi15 Auto Fault low class3
gi16 Auto Fault low class3
gi17 Auto Fault low class3
gi18 Auto Fault low class3
gi19 Auto Fault low class3
gi20 Auto Fault low class3
gi21 Auto Fault low class3
gi22 Auto Fault low class3
gi23 Auto Fault low class3
gi24 Auto Fault low class3
The picture of the switch powered on while it is unplugged.
Thank you,
Jarrett
http://www.jarrettcadiz.com
http://www.cloudchase.net/company/jarrettcadiz
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