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CableZL 09/30/20 4:35:30 PM #1: |
Basic diagram
SW1: Cisco 3750X port gig 2/0/4 <----> SW7: Cisco 3750X Port gig 1/0/3 SW7 is bouncing SW1 claims SW7 is drawing power over ethernet and granting it, then the port goes down and comes back up. WTF --- ... Copied to Clipboard!
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Mezcla 09/30/20 4:36:18 PM #2: |
have you tried turning it on and off again?
wait no of course you have. are you sure its plugged in? --- Sig ... Copied to Clipboard!
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CableZL 09/30/20 4:38:13 PM #3: |
Mezcla posted...
have you tried turning it on and off again?Yeah, it's plugged in... From what I understand, a switch of this model should never try to get power over ethernet from another device. Can't reboot the device without causing a ~5 - 15 minute outage for certain devices at a store --- ... Copied to Clipboard!
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BlazinBlue88 09/30/20 4:40:35 PM #4: |
When you say SW7 is bouncing do you mean the connection or the entire switch? Entire switch might be a power supply issue.
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eston 09/30/20 4:40:57 PM #5: |
Have you tried hitting it
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CableZL 09/30/20 4:41:11 PM #6: |
Probably gonna let the on call guy look into it more. Unless it's a bad ethernet cable between the two switches, that's the only thing I can think of... Not sure why a cable would cause a switch to grant power on its own, though
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Shinnokxz 09/30/20 4:42:06 PM #7: |
Same, my first instinct is bad cable
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CableZL 09/30/20 4:44:49 PM #8: |
BlazinBlue88 posted...
When you say SW7 is bouncing do you mean the connection or the entire switch? Entire switch might be a power supply issue. The power to SW7 is stable, but the connection between SW1 and SW7 is going down over and over CDP Neighbor info on SW1 port 2/0/4: Device ID Local Intrfce Holdtme Capability Platform Port ID SW7 Gig 2/0/4 128 S I WS-C3750X Gig 1/0/3
Log: Sep 30 15:30:48.252: %ILPOWER-7-DETECT: Interface Gi2/0/4: Power Device detected: IEEE PD
Sep 30 15:30:50.400: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/4, changed state to down Sep 30 15:30:51.431: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/4, changed state to down
Sep 30 15:30:56.506: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/4, changed state to up
And that just repeats --- ... Copied to Clipboard!
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BlazinBlue88 09/30/20 4:54:35 PM #9: |
CableZL posted...
The power to SW7 is stable, but the connection between SW1 and SW7 is going down over and overYeah then I'd go with the other user and accuse the eth cable. --- ... Copied to Clipboard!
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CableZL 09/30/20 4:59:16 PM #10: |
It's stable now. I'm checking with the on call guy to see if they replaced the cable. That's the only plausible cause, imo. I just never imagined this kind of thing would happen because of a bad cable.
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Solid Sonic 09/30/20 5:02:17 PM #11: |
Shinnokxz posted...
Same, my first instinct is bad cable Layer 1, baby, always worth a look. It's the hardest thing to actually understand from the point of someone who doesn't interact with it full time. If all you can see are the readouts from a switch but can't figure it out on the endpoints, you could be looking at a media issue and that is hard to see. --- "It feels like I'm always wrong." "Nah, that's not true...I mean you just made that statement, didn't you?" ... Copied to Clipboard!
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Questionmarktarius 09/30/20 5:05:09 PM #12: |
Solid Sonic posted...
Layer 1, baby, always worth a look.Mysterious power request and then the port shutting off implies a short somewhere. ... Copied to Clipboard!
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CableZL 09/30/20 5:07:20 PM #13: |
Solid Sonic posted...
Layer 1, baby, always worth a look. It's the hardest thing to actually understand from the point of someone who doesn't interact with it full time. If all you can see are the readouts from a switch but can't figure it out on the endpoints, you could be looking at a media issue and that is hard to see. Yeah, I would say that I have a number of layer 1 knowledge gaps because I learned networking by reading Cisco books for certification exams... Up to CCNP Route/Switch, it didn't cover much about layer 1 at all. --- ... Copied to Clipboard!
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BlazinBlue88 09/30/20 5:17:12 PM #14: |
CableZL posted...
Yeah, I would say that I have a number of layer 1 knowledge gaps because I learned networking by reading Cisco books for certification exams... Up to CCNP Route/Switch, it didn't cover much about layer 1 at all.We all have gaps somewhere. Hard to get that knowledge without getting the hands on experience. --- ... Copied to Clipboard!
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Poop2 09/30/20 5:23:33 PM #15: |
could it just be a hardware failure somehwere?
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Solid Sonic 09/30/20 5:27:19 PM #16: |
BlazinBlue88 posted...
We all have gaps somewhere. Hard to get that knowledge without getting the hands on experience. I always panic that people will see through my facade and realize I'm operating out of my ass. --- "It feels like I'm always wrong." "Nah, that's not true...I mean you just made that statement, didn't you?" ... Copied to Clipboard!
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CableZL 09/30/20 5:31:30 PM #17: |
Poop2 posted...
could it just be a hardware failure somehwere?I'm hoping the hardware failure is just the cable. Seems to be fine right now, but I'm not the one who stabilized it. --- ... Copied to Clipboard!
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