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--- Begin Message ---Am 15. März 2025 04:54:15 MEZ schrieb Michael Richardson <[email protected]>: > >I brought an OpenWRT One to IETF122 Hackathon. > >I plugged the 2.5Gb/s port into the IETF hackathon network, and the switch >apparently has PoE (which I didn't care about). I hooked up the rest of the >cables, >including the USB power, but didn't turn it on yet. I was surprised when I >opened the console that the system was running.... kinda. > >With the cable in the PoE port, the device was in a reboot cycle. Getting to >just before the console shell starts, and then restarting. I can post a log >if that's useful to someone. >I guess because there wasn't enough amperage on the PoE port. I unpluged, >turned on the USB adapter and things were fine... so I reconnected the PoE >cable, and >the system crashed... back to reboot cycle! Oh. That's bad. > >I "solved" the problem by inserting a my non-PoE switch in between. >I could have also swapped ports, it now occured to me. > >I'm just mentioning this for the benefit for someone searching! > >I suppose this is a hardware problem, and probably not solveable. >Maybe I could cut a trace, or maybe there is a zero-ohm resister I could >unsolder to disable PoE. > >Maybe fixable in Two: prefer USB power if it's present. >But of course, when I started, it wasn't present, as I wanted the system to >be off until I was ready: I wanted to finish getting serial console alive >before I powered on. > >The switch in question: > >LLDP neighbors: >------------------------------------------------------------------------------- >Interface: enxd43a650cda24, via: LLDP, RID: 2, Time: 0 day, 00:25:46 > Chassis: > ChassisID: mac cc:98:91:86:53:80 > SysName: sw-128.meeting.ietf.org > SysDescr: Cisco IOS Software, C3560CX Software > (C3560CX-UNIVERSALK9-M), Version 15.2(7)E11, RELEASE SOFTWARE (fc3) > Technical Support: http://www.cisco.com/techsupport > Copyright (c) 1986-2024 by Cisco Systems, Inc. > Compiled Fri 23-Aug-24 13:34 by mcpre > >-- >] Never tell me the odds! | ipv6 mesh networks [ >] Michael Richardson, Sandelman Software Works | network architect [ >] [email protected] http://www.sandelman.ca/ | ruby on rails [ > Hi Michael, you don't happen to know the exact switch model? C3560CX is a family. the 8 port model (240W budget on DC power) could provide 30W to every port, unless one of the devices connected to the switch also uses UPoE/PoE++. More likely would be that the switch itself was powered via PoE I assume so the budget was pretty low already. Which OpenWrt version was running on the One? (tag or hash) Regards Felix Baumann
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