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Ask the Expert- SD-WAN

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WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Hello,

One of our customer just bought this switch which is connected through 2 trunk links to another switch, where it's getting it's power from over PoE.

He did not bought an separate power supply, and whenever we plug in an PoE device or just an laptop the port does not go up.

When I do an show power inline I get this output. (the trunk links are ports 9 + 10).

Available:0.0(w)  Used:0.0(w)  Remaining:0.0(w)

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi0/1     auto   off        0.0     n/a                 n/a   30.0
Gi0/2     auto   off        0.0     n/a                 n/a   30.0
Gi0/3     auto   off        0.0     n/a                 n/a   30.0
Gi0/4     auto   off        0.0     n/a                 n/a   30.0
Gi0/5     auto   off        0.0     n/a                 n/a   30.0
Gi0/6     auto   off        0.0     n/a                 n/a   30.0
Gi0/7     auto   off        0.0     n/a                 n/a   30.0
Gi0/8     auto   off        0.0     n/a                 n/a   30.0

Does anyone has any idea why the ports does not seem to work?

We already tried a reboot and a shut/no shut.

Please let me know if you require additional info.

Thank you

7 REPLIES 7

WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Hi,

3560C PD PSE Switch 8 GE PoE, 2 x 1G Copper Uplink, IP Base, which support POE for 8 ports. Uplinks are not POE.

WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Goodmorning Abdul,

Thank you for your reply,

but the switch is powered by 2 trunk uplinks as I understood.

There's no power supply/adapter connected to the switch currently, except connected to another switch over those 2 uplinks.

Can you please clarify what you mean?

Thank you in advance!

Participant

WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Hi Daniele,

your switch 3560CPD-8PT-S is PoE. But it depends on if uplinks provides enough power for this switch. Regarding configurarion of PoE please read manual below.

Please check if your switch is connect via PoE+ or Cisco UPOE technology.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/15-0_2_se/configuration/guide/scg2960/swint.html#wp2047530

Also please check this document 1-6 section

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960c_3560c/hardware/installation/guide/2960c_3560c_hig.pdf

HTH,

Jan

WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Hello Jan Rolny,

Thank you very much for your links,

The uplinks are providing PoE 15.4W each port, as I understood from the tables (table 1-2, page 1-8), the available PoE budget is 7W.

Does this mean it's 7W per port? or 7W total? Since when I connect 1 ip phone (6.3W) it should work right? I probably should prioritize the port or something like that?

I've tested it with 1 IP phone and it does not work. Even though I connect an laptop it does not work. Show interfaces status shows 'notconnect'.

Can you tell me if I interpreting it correctly?

Thank you very much

Beginner

Re: WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Hello man

I have exactly the same situation. Was u lucky to overcome this problem? 

Highlighted
Beginner

Re: WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

bad h/w. replace unit.

Beginner

Re: WS-C3560CPD-8PT-S - ports not coming up, and PoE is not working

Sir, you need to read table 1-3, not 1-2.

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