Cisco Switches :: SG300-28P - POE Power Drops Every Several Minutes
Sep 10, 2012
We have an SG300-28P which, at intervals between 5 and 30 minutes or so, drops power to all of its POE-powered ports and then immediately restores power. The switch logs nothing when this happens other than recording that the ports went down and back up, even with debug logging enabled. Non-POE ports are not affected.
When the problem started there were only four POE-powered devices on the switch and we are far under our power budget. (While testing I added a fifth device, see below.)
Not all combinations of devices cause the drops to occur -- specifically, it looks like having devices on ports near each other causes the drops. When the drops occur, the absent counters of all of the POE devices increment. I noticed this earlier thread here seemed similar: [URL]
but in that case, he got no power at all in the adjacent configurations, instead of having it drop every several minutes.
I'm running
sw06#sh ver
SW version 1.1.2.0 ( date 12-Nov-2011 time 23:34:26 )
Boot version 1.1.0.6 ( date 11-May-2011 time 18:31:00 )
[Code].....
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Jul 10, 2012
I use Cisco switch sg300-28. When i turn it off and turn on, it reset to factory reset include login password, dose it normal operation or I miss anything?
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Feb 26, 2012
Essentially, not all ports on our brand new SG300-28P switches provide Inline Power to our older 7900 series phones. I can connect the phone a couple ports down and it usually powers up, but not always. Often I can also connect an 802.3af device to one of the troublesome ports and it will received power, however I am noticing there are some ports that now refuse to supply PoE at all?
This is equipment that has been running perfectly fine for several years now, on C3524 PWR XL switches. I can also tell you that this is not isolated to one switch, but all 5 of our SG300 access switches. And, yes, the firmware has been updated to 1.1.2.0.
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Aug 29, 2011
These are our first switches and seems like GUI is lot different than the online. Out intervlan routing is o not working. I am absolutely sure that I setup the switch in L3 mode since it allows me to create mutiple interfaces. I am hoping that this GUI issue is related to interVLAN routing.
Below is the blog I started for InterVlan issue [URL]
This is the link for online simulator and what I see in its IP tab. I know this switch is not SG300. [URL]
This is what I see on our switch.
Our switch version
switchd64684#show version
SW version 1.1.0.73 ( date 19-Jun-2011 time 18:10:49 )
Boot version 1.0.0.4 ( date 08-Apr-2010 time 16:37:57 )
HW version V01
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May 26, 2011
1) I have a Cisco SG300-28P. I plan to add a SG300-52. Would it be possible to manage the new switch through the SG300-28P web browser ?
2) There are 2 fans in the POE model SG300-28P. How many fans are they in the non POE switch SG300-52 ?
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Feb 8, 2012
Can I connect a single Cat5e cable between two SG300-28 and link them? If so what must I configure?
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Jul 25, 2012
I have SG300-28P that I am using as layer-3 switch. Recently I ran in to SG300-52 switch and even though loading same firmware doesn't give me option to do layer-3 switching. For SG-300 I see options in GUI to create vlan interfaces under IP information section, while SG300-52 has IP information option only under the management section.let me know if these are 2 different hardware types and L3 is not possible on SG300-52. If its possible to enable L3 switching on SG300-52?
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Jan 19, 2013
an issue with my modem (i think) I currently cannot get an Internet connection on my computers via wifi for some reason iv tried resetting it but it seems to pick up all the PC's and then 5 minutes later it just drops out which is annoying cause it says that the modem is still receiving Internet and were not getting it iv also tried a new router but the same issue and the speed of Internet is basically halfed what do I do iv tried heaps but it's just ******* me off now
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Jan 15, 2011
Just starting a couple of days ago my internet started dropping about every 10-20 minutes. The problem is only with this computer. I have a laptop right next to me and it works fine no problem and two other PCs that don't have any issues so I don't think it is the router. I have scanned my computer with different antivirus software and it's clean. The computer is always connected with a full 5 bars and says it has internet access but sometimes it drops and in order to get it up and running again I unplug the wireless adapter and plug it in again. At first I thought it might have been the adapter so I swapped it out for a new one and I'm still having the same problems. My wireless is unencrypted. This keeps happening over and over again and I am stumped on what to do.
equipment: WRT54G linksys router
belkin surf and share n300 adapter
linksys ae1000 adapter
windows 7
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Jul 16, 2010
I have a DIR-615, hardware version: C1, firmware version 3.12NA and my issue is that it keeps dropping my VPN connection after 12 minutes. Sometimes it'll go longer than 12 minutes but on average right at 12 minutes of my connection, it drops. This happens whether I'm using the wireless or hard wired to the router. As a test, I ran a continuous ping on a computer on my internal network and also to a computer on my corporate network. When I'm VPN'd in, both pings are successful. Once the router kills my VPN session, the pings to my internal network are successful. So the router isn't rebooting or anything like that. My VPN session will automatically reconnect, but I'm stumped.
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Oct 10, 2012
We have a VPN established between the above devices (I don't have more info on the Juniper as it's a client site) The Juniper initiates the VPN and all is well, tunnel is up all ok but approx every 45 minutes the VPN drops.
the tunnel parameters are set to keep it alive for 8 hours but that doesn't work.
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Jan 26, 2011
For some reason, certain activities, such as using Bittorrent and visiting specific sites, causes my connection to drop immediately. It stays down for five minutes, after which the connection is reestablished... but if the offending progam is still running or I try to refresh the site, it drops for another five minutes.I really need to know what is causing this, and how it can be avoided. It only started this last weekend (22/1, 2011), and my ISP says they have no problems on their end. I'm running Windows 7.
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Sep 14, 2012
So, I just upgraded my mobo/cpu (Z77A-G45 and i5-2500k) and I'm having an issue with my connection as it seems to drop every 5 to 15 minutes constantly and have no idea what exactly is wrongThe kicker is my old mobo did the same thing and I had to do something in win7 to fix it (not sure if it was the drivers or what) but I just can't remember what exactly.
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May 7, 2012
I can't win. After dealing with the internet dropping once every two weeks, I decided that upgrading the firmware might work. Turns it all it did was exacerbate the problem and now my internet drops every few minutes. I've been plugged into my modem for a good 20 minutes at this point with no drops. Has my router just shit the bed or can this be fixed?
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Aug 2, 2012
I am having an issue with my network connection. I have tested the connection itself and it's not a problem on my ISP's end or the connection itself, but seems to be caused by hardware/software errors originating from the computer. It almost appears as if the connection is being capped or the like, because the signal is very strong when I connect to the internet at first, then after a few moments drops (consistently every time I try reconnecting) to an unacceptably low signal level.
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Aug 26, 2012
I recently bought a refurbished E1000 wireless router from Amazon, and from the first day I've had recurring connection issues with it. Every half hour or so it will lose all of its connections (wireless and ethernet) and requires a hard reset. After resetting, all connections are good for a little while but then the problem occurs again. When plugged directly into my modem (Motorola SB6121), my internet access is completely fine.
The router has the latest firmware as far as I know (2.1.02 build 5 May 6, 2011), and I've tried to change several settings (MTU to 1400, Fragmentation Threshold to 2306, etc) but to no avail.
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Jul 17, 2012
My internet connection drops every 10-30 minutes and reconnects. The modem seems to reset (every light except the power one). I have a Zoom model 5241 modem. Additionally, I cannot access my modem's status page [URL]. It's as if I'm trying to access a site that doesn't exist. Comcast sent a tech who replaced a splitter, but that didn't work.
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Jun 1, 2012
Can a Cisco SG300-10P switch power a Cisco SG200-08 switch over POE? Or an SG200-08P power an SG200-08 via POE? I have an area where I'd like to put a small switch, but would like to avoid having to have electrical power run to it. Or will the SG300 and SG200 POE switches only power endpoint devices such as cameras and IP phones?
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Nov 21, 2011
I'm replacing 2 3COM 4500 Swithes with the SG300-52 Cisco switch. We have 3 VLANs, 10, 20, 100. The switch is set for Layer 3 and I have setup DHCP relay. what settings i should set on the Cisco for the following setups:
3COM Setup
#
interface GigabitEthernet1/0/1
[Code].....
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Jan 1, 2013
We have several of the SG300 Serices switches. We use them to route VLAN traffic to Remote Offices, Internet Connections, and WiFi Access Points.In one remote office we have a SG300-10 setup to route the HQ Network and the remote Office Subnet. The SG300 is Connected to HQ via Fiber and has multiple Tagged VLANs on it. If I do speed tests over the Fiber Link on the Incoming Tagged Netwotk I get Decent performance, 80Mbs. If I switch to a networtk that is not priginating from HQ, and have the SG300-10 route packet, I get dismal performance. 15-20Mbs.
I Fireded up a New SG300-28P FW v1.2.7.76. Added a the HQ VLAN 101 and new VLAN 1025 . Mapped some Tagged and untagged ports for each. Switch was connected to HQ Network as untagged VLAN 101. I put a laptop on an Untagged VLAN 101 port. Ran some tests, cam back with 750-850Mbs. Great. Put the same laptop on a Tagged 101 Port, Configured the NIC for Tagged VLAN 101, Same test, same Speeds, 750-850Mbs.I then Configured laptop for Tagged VLAN 1025. Connected to tagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!
I then Configured laptop for Untagged VLAN 1025. Connected to unagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!It was only the Laptop and the Connection to the HQ net on the SG300-28P. Why is the performance of this unit soooooo poor when it needs to route?Other Switches have FW v1.0.0.27 or FW v1.1.2.0. They have Similar speed issues. All Configured for Layer 3.
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Dec 18, 2011
does the SG300 switches can be used with Microsoft NLB in Multicast mode?I know on traditional Catalyst switches you can statically "map" IP's to mac's and then to multiple ports but this doesn't seem to work correctly on the SG switches - it gives an error about the mac not being not Unicast?
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Aug 7, 2011
Any snmpset commands to add, modify and delete vlan table entries on SG300-10 switches? I checked url... however this information is apparently only valid for catalysts. The latest firmware is installed and the provided MIB files are used.
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Aug 20, 2012
I'm going to have several SG300-28P switches to setup. I'll need to create multiple vlans for data, voice, and wireless traffic. I have the following questions in setting up this configuration:
VLAN 1 Management
VLAN 100 Data
VLAN 200 Wireless
VLAN 300 Voice
1) For managing the switches via IP, will LAN1 be the default management network? Should I create a seperate VLAN for managing the switches?
2) For uplinking the switches together, I plan to trunk a port to connect the switches together. What's the configuration on the trunk port to forward all vlans from one switch to another?
3) On some ports, I want to configure a trunk for two vlans (Data and Voice) where the phone has a pass through for PC. The phone supports tagging for the PC and the VoIP traffic. For example on port 10, would VLAN 100 and 300 be set to tagged?
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Jan 19, 2012
I'm having alot of trouble trying to connect more that one LAG between two SG300-52 switches.Basically i have configured both switches with the same vlans. For 2 of the vlans i would like to connect them together between the two switches using LAG. Switch1 has Vlan 5 (ports 1-12) & Vlan 10 (Ports 25-36) with LAG configured on ports 1-2 and ports 25-26. I have setup the second switch identical to the first. But when i connect the LAG's there is no connectivty. If i disconnect one LAG the other starts working.Can you only have i interconnect LAG between switches?
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Apr 22, 2012
I have two SG300 serie switches and two Gigabit connection between them. How do I configured these two links to work toghether like a one 2 Gigabit channel?
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Dec 9, 2012
When our DSL modem drops its connection, even momentarily, the RV220W requires a power cycle before the computers on the LAN can browse again. When I connect to the router, the WAN Information displays the word Connecting, rather than Connected.
We have a DSL modem connected to the router, the router connected to an ethernet switch, and our small business pc's connected to the switch.
Firmware on the router is 1.0.4.17
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Jun 14, 2012
My computer is a Toshiba Sattelite o/s win 7. My wi fi signal is excellent, yet my signal keeps dropping or saying limited access.I have tried resetting the router and resetting my default windows settings on the computer. All other lap tops and wireless devices in the house do not have an issue.I discovered the other day as long as the laptop ( not the router) is plugged in and not running on batter power that i do not have a problem staying connected.For fun i wondered if it had something to do with the power cord making some kind of connection when plugged into the lap top, (since everything is more compact in them)I tried having the power cord plugged into the lap top but not into a power source but I still lost signal.
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Aug 11, 2012
I own a CISCO Linksys 3500 router I use in my home. Every time there is a power outage, the router stops working. The only way I have managed to get it to restart is to remove the software, disconnect the router and then re installed and set up the router again
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Jan 19, 2013
Immediately after a power outage, my internet connection predictably drops after a set period of time or usage. It is either after about 30 min or 5-15 mins of watching Netflix. I have a modem hooked up to a wireless router and use the network on my iPhone, laptop and Roku. Since the problem, I have dropped to just having my laptop connected but this has not worked. The wireless network will disappear after the 5 - 20 mins, the light on the modem and router will show no internet (all other lights are normal). Internet connection will be reestablished if I either unplug both the modem and the router (not just one or the other) OR if I unplug the ethernet line from the modem to the router and plug it directly into my laptop (the internet light on the modem will go from "off" to "on"). Despite internet connection working from transferring from the router to the laptop if I connect it back to the router, the internet lights goes off again (resolves upon unplugging and plugging modem and router back in). The internet has not yet dropped when it is physically plugged into my laptop.
I have tried the following:
-Powercycling (temp fix until it crashes again)
-Plugging into a different outlet (I cannot connect it to a different phone line, only have 1 with DSL. Also, I do not have phone service or cable, just internet via DSL)
-Resetting modem
-Resetting 2 different routers
-Calling ISP, their test of the modem was inconclusive
Again, my wifi does not see my network whenever the internet is dropped or the ethernet cord is unplugged from the modem. The outlets I have it plugged into has some type of electrical issue, two electrical devices have shorted out in the room they are in. I do not think this issue is electrical, everything seems to have constant power (unless the power outage shorted out something in the modem). Below are some details of my modem and router. I will provide any additional info requested. I will gladly buy a new modem but I want to see if it can be fixed first.
My modem: Westell
WireSpeed Dual Connect
Model: A90-210030-04
DSL Statistics
Line State: Up
Modulation: G.DMT-Mode
Data Path: Interleaved
[code].....
Router: Linksys E2000 Internet Connection Type: Automatic Config - DHCP (I tried PPPoE and it never got a valid IP address from my ISP)
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Nov 25, 2011
Our wireless network has started to drop out periodically. If we pull power and restore, the network immediately comes back up on all our our devices. We have the WRT54G, and we have 2 PCs, 2 Macs, and 3 iPhones, and a wired home phone. Normally there are not this many devices connected, but with everyone home for Thanksgiving and all these devices on the network we have started to see this issue.
Are there simply more devices than the router can handle? Is one of the devices crashing the network for everyone? What typically will cause something like this?
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May 9, 2011
I have a question, does the SG300-28 support VTP and STP?. I want to add it to my network's VTP domain so I don't have to manage vlans manually on the SG300-28 and also be able to configure STP to keep my network loop free.
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Jul 19, 2012
On my SG300 I set up LAG for the last two ports.
I then plugged them into my SRW224G4P, once I do that I get dropped packets.
I was thinking maybe doing firmware upgrades to both switches?
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Jan 29, 2012
I need to know how to configure each port in switch SG300-10 to vlans, i need to configure one port "trunk" with catalyst switch and assign 4 ports to different vlans. any solution?
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