Cisco Switching/Routing :: 3850 - Link Light On But No Cable Connected?
May 8, 2013
I just completed installation of a stacked pair of 3850s in my datacenter. While I was installing them, I noticed that the lights on ports 1-8 on one of the switches were on solid even though there were no cables connected to that switch. I don't see anything in the logs or anywhere else in the CLI that indicate a problem, however the lights remain on. This only happens on switch 1, not switch 2. Once I plugged the cable into port 1, it flashes normally with activity, but 2-8 remain on solid even though nothing is connected to them.
Before I put the switches in place, I had configured them at my desk with the console connection, and those lights were not lit up.
The indicators on the front of both switches are set in STAT mode. I thought initially I had hit the button and flipped it to a different mode, but that is not the case.
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Apr 23, 2013
Can the new Cat 3850 run MPLS ?
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Jan 28, 2013
Cisco has put up the data sheet for the new 3850 switches. What do you all think about this new unified wired/wireless concept?
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Mar 3, 2013
I just started a evaluation license for IP Base on my 3850 switches. But i can't configure HSRP cause the commands are not there (I rebooted allready). Do you need enterprise for HSRP on the 3850?
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Jun 7, 2012
I just started a evaluation license for IP Base on my 3850 switches. But i can't configure HSRP cause the commands are not there (I rebooted allready). Do you need enterprise for HSRP on the 3850?
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May 6, 2013
What is the preferred access switch for new deployment. Choosing between 3850 and 3750x. I have to say that the 3850 wireless features will not be used in this deployment and 4 switch for stack is enough... Looked and read everything that I found in the press, I can not make an informed choice. I bow to 3850, but I was apprehensive following circumstances:1) not too positive reviews2) to long list of open caveats3) to long list of features are not supported in Cisco IOS XE Release 3.2.0SE4) IOS XE : (With regard to the first three points - yes, I understand that the product is new and it has not gone further stage of "childhood diseases" ...Regarding the fourth point - I understand correctly that this is the direction to be moving Cisco Systems and soon all products migrate from classical IOS to IOS XE and so on?
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May 16, 2013
With my brand new Cisco 3850 Switch, I got it configured with a LAN IP. Then, on my PC I opened up Cisco Network Assistant (version 5.8.5.1 which supports the 3850). I went to add the 3850 to the community by discovering the device, and was prompted with the user/pass box. The password I set was not allowing me to connect, and I realized it's because a username was required and I had not set up a username on the switch. So, I then configured an admin user with level 15 privileges on the switch. However, now when in CNA I try to add the 3850 to the community, it doesn't even prompt me for user/pass, it just says "unable to connect".
What do I need to do to add this 3850 to my community?
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Jun 2, 2013
I have configured my new 3850 using the command line and all works well. I logged into the web interface expecting to see device manager with a pretty image of the switch etc.
However I am presented with the Express Setup page and even if i fill in all of the details again and click submit then nothing happens and this is all I can get.
I have version 03.02.01SE software.
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Apr 18, 2013
We have a new stack of two Catalyst 3850-48T's running IOS XE 3.02.00 (we are upgrading to 3.02.01 this weekend.)We noticed the CPU usage is around 30% even when there is almost no traffic going through the switch. We haven't seen any indication that it is causing a problem, but is this considered a normal baseline?I attached my config (with passwords sanitized,) show ver, show controllers utilization, and show process cpu history.
I noticed this behavior is normal on 2900XL/3500XL switches, but I didn't find anything relating it to 3850 switches. Does the same thing apply to the 3850 switches? [code] url...
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Jun 3, 2013
I have a network coming up for a switch refresh. Management is pushing for 2960s and I would like 3850s. We are running Cisco Voice and Video over the network. I saw a few things that seemed to be in favor of a Layer 3 switch vs. a Layer 2 switch. Some items like better performance due to switching based on IP vs. switching based on MAC. Some information that will show the 3850 to be a better choice or that the 2960 is capable.
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May 14, 2013
I pulled a brand new Cisco 3850 Switch out of the box yesterday. Following the Quick Start Guide, I put in the power module, powered it on, and waited for it to complete POST. Then, I plugged in an Ethernet cable between a laptop and the switch on a port in the front, and went to the web interface at https://10.0.0.1. I got to the Express Setup, and attempted to change the IP address of the switch to an IP on my LAN, along with other options. When clicking submit, it didn't appear to take. Upon refreshing in the Express Setup, the IP config was blank, so I once again configured it. This time clicking submit brought up a message that it was changing the IP address. I waited for it to finish, and when it looked done, I powered the switch off and took it to a different room to hook it up to the LAN for further configuration.
When plugging in the power at that point, the switch starts through the normal light process (System LED blinks green slowly), and then eventually the System LED blinks green very fast and never stops. It doesn't get to the point of having the system loaded and ready to log into. There's no amber lights, just the System LED flashing green fast. On the back, the Power module and all bay lights are green, and the Console light is green, but the Management port light is off.
I've tried using the reset button on the back of the switch two different times to reset it to default configuration, thinking I hosed it somehow, but it never goes past the fast blinking System LED.
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Feb 10, 2013
Based on what i am reading on the Catalyst 3850 datasheet, the controller functionality comes by default if i have a IP Base of IP Services license on the switch. Is this correct or do i need additional license to enable the controller functionality?What capabilities does below license provide ?
LIC-CT3850-UPG (Primary upgrade license SKU for Cisco 3850 wireless controller)
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Jun 4, 2012
I am troubleshooting a fiber connectivity issue.Now I have two switches, one is 3750, and another is small biz 300 series switch. Both switch has a single mode smf gbic. Now I have two swtiches face to face and connect with a single mode cable. Do you think if I would get a link light on? Both ports are no shutdown.
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Mar 13, 2013
how the Nexus 5500s work ?currently we have two 6513 Core switches 6513-1 and 6513-2 running HSRP and RSTP. 6513-1 is currently the Root Bridge, 6513-2 is setup as our secondary root. We also have two 5548UPs setup with a peerlink between them. Picture attached. "Current Setup.jpg"
There is a 20gig port channel between the 6513s and also a 20gig port channel(peer link) between the 5548s. 5548-1 has a 10g fiber running back to 6513-1 and 5548-2 has a 10g fiber running back to 6513-2. Currently now Spanning tree is blocking the link from 6513-2 going to 5548-2 which is what we expect. We were working on moving some things to different racks the other day and moved switch 5548-2 to another rack and brought it back online without the peerlink fiber connected. We started to have issues and tried to plug the peer link back up, but still continued to have issues. We started to troubleshoot and noticed that both 5548s were acting like the master of the VPC domain and was not letting traffic pass accross the Peer Link. We then rebooted the 5548-2 with the thought that it would come back up as the secondary in the VPC domain. When it finally finished booting back up it then caused a huge loop in our network accross both uplinks to the 6513s and the 5548s peer link which in turn took our network down. Spanning tree did not work like it was suppose to and block the port going from 6513-2 to 5548-2 in time.
My thought was this didn't seem like a good setup. I went to the drawing board and decided we needed to have an uplink from both 5548-1 and 5548-2 going to 6513-1 setup as a port channel/VPC and also a uplink from 5548-1 and 5548-2 going to 6513-2 setup as a port channel/VPC. Picture Attached. "NewSetup.jpg" We are also planning on buying a "2K-C2224TP-1GE" to hang off the 5548s to use for ethernet.
how the Nexus 5ks work and haven't done a lot of research on them. Would this not be a better setup since both switches will have an active link to the root bridge? The links from the 5548s going to 6513-2 should always be in a block state until we loose both uplinks to 6513-1 or the entire switch itself correct? Also how will the 5548s reactive if I was to loose the Peer link fiber? Will they continue to work as normal? When it looses this Peer Link does it suspend all the VPCs for the servers on the secondary switch in the Domain so the network doesn't get confused on which link to send traffic up since there isn't a peer link active or is this not the case? Also with the peer link down will the 6513-1 know which 5548 to send the traffic to if there is only 1 device (not setup in a VPC) on one of the 5548s? What are your recommendations/best practice on the setup for the 2k?
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May 10, 2013
i recently bought my dir-615 to hook up with my tp- td 8816 modem. After setting it up and successfully working one day, the router randomly stopped sending a WiFi signal. I restarted it twice and it began to work once more. I decided to install dd wrt build 21061 for my E3 dir -615 router. Unfortunately, i could not get it to work. I have dsl internet and my isp uses PPPoE. I used the option for the set up and filled out the appropriate information, but it would not work and the internet light on the router would turn orange.
Unfortunately i decided to play around with this router at the wrong time and the people in my house needed it. I decided to quickly re flash it by going into the emergency room(holding reset button during router reset until orange button starts blinking). However when i select the official d link firmware, it simply will not change. The page is stuck loading on the d-link emergency room page with no progression whatsoever. I tried the process 3 times already.
For some reason, i can connect to the router through WiFi but not through cable. When i connect through WiFi i am on the dd wrt firmware. I don't think i can return the modem to the store since it is clearly on DD WRT firmware.
I'm either looking for a solution to re flashing back to stock firmware, or making the internet work on the dd wrt firmware. The internet light turns orange when i select PPPoE on the set up...
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Jan 8, 2013
I am trying to implement in the lab. I have 2 switches 3550 and 3750. my questions are:
1. why i can't see vlans in the running config on switch 3750 even after i created 3 vlans?
2. the 3750 is power over ethernet switch and i am trying to connect 3550 and 3750 thru cross over cable trunk link and the ports doesn't show up no light nothing. is it the right way of cabling.
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Jul 15, 2012
What the little green/red light is on the back upper left corner of the switch is? It inside a little mesh and I belive it says vt_fail next to it.
Had water get on our switch over the weekend and this guy goes red when I fire off on demand diagnostic, but not relevant errors in any of the logs. Haven't gotten to the point where I am putting data back on the switch yet.
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Nov 17, 2012
i have standalone 3750 switch. RPS light is green and system light is off.
3750TS#sh env all
FAN is OK
TEMPERATURE is OK
[Code].....
i have another switch with same model and ios its RPS light is off and system light is green
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Feb 7, 2011
I am trying to connect a cisco catalyst 3750g-48ts with our exsiting 3com corebuilder 9000 using the SFP ports, I have established a link and the interface is up.
The issue is that no data is passing through between the two, everything looks like it's up and enabled, spanning tree has detected the uplink port and has automatically set it to forward, both devices suggest the link is in place and the lights are on .
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Feb 20, 2012
I have (2) Sup 32 configured in a 6509 chassis. I have 1 power supply plugged into the wall and 1 power supply that is not plugged into anything but it is in the chassis and has green light to show that it has been recognized.
My problem is the "system light" on both sup32 remains amber and does not turn green. I have done show modules and sh diagnostics and sh power and everything checks out OK. Also there is an amber light on "active" on the 2nd Sup32 which I am assuming means that it is in standby mode so that would be correct.
Q: My question is could it be the power supply that is not plugged into anything causing the "system light" to stay amber and not turn green?
Q: Will this amber system light on the Sup32 stop the 6509 from running as normal?
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Feb 5, 2013
Recently I have installed and configurated an AP 1260, it has already IP, SSID, and ping to the router, but after install the antenna I open the web configuration and see that it has 0 clients connected and the light is always green, indicated as only is configurated with nobody connected.
Tha radio setting is up, 2,4 Ghz and 5 Ghz any issue with the antenna? or i need to configure anything else?
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Mar 24, 2011
I've seen related to flashing power lights on the router involve fixes via firmware upgrades off a PC.I'm on an iMac os 10.6.7. The WRT54 used to work as a wireless modem a couple of years ago. Tonight, it doesn't. power light blinks. Can't access any webpage interface for the thing. Reset, power down, computer restart, cable modem turn off don't change anything. Is there anything that can be done other than tossing the linksys? If that is the only option, are there wireless routers more suitable for a Mac?
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Mar 6, 2013
When my Toshiba Satellite notebook first begins booting up, the ethernet cable "connected indicator" light is ON, but somewhere around the halfway booted-up point, the light goes out. Once booting is completed, I get the message "Network cable is unplugged". The cable is definitely plugged in, as I also have Ubuntu Linux running on this same machine (dual-boot), and use this cabled-connection ALL THE TIME (for both LAN and Internet access)
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Apr 4, 2012
My WAG120N power light is always red whenever plugged in. I can't access the configuration page. My adapter works fine and the Reset button doesn't work. I can't find any troubleshoot for the "red power light" problem in user manual !
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Mar 27, 2013
My Cisco WAG32ON internet light in blinking red
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Nov 23, 2012
When my X3000 Cisco who works fine when my pc which is connected via the cable port in the adsl modem. (Light is blue)But when the pc is switched off, the light becomes white and no internet connection on our wifi connected devices although we manage to have the connection on the wifi network.
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Dec 26, 2011
I recently purchased the Linksys Wireless N Home WAG120N and I've hooked it up correctly but I can't seem to establish a connection with the DSL light. I've tried hooking it up to different ends in my house with no improved results, however, my older modem works fine.
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May 19, 2010
I'm having trouble connecting via ethernet to my WAG200G. Everything was working fine a week ago but now, nothing.The problem is only occurring with one computer and I've tried the troubleshooting guide on the website to no avail.When I connect the ethernet cable from my computer to the modem/router, I don't get a light on the front panel on any of the ports. I've changed cables, ports, disabled ZoneAlarm and firewalls and nothing comes up. I've checked the ethernet connection from the computer to another computer and it's working fine.
On a different computer, I have no trouble connecting to the ports and can confirm that 1-4 are working and the lights come up.
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Aug 24, 2012
I just bought linksys EA2700 to replace my U.S Robotics .. but when i try to connect it like the old router , the internet lights won't turn on, is it because i have to use a modem then use ethernet cable ? can't i just use ADSL cable directly to the router like robotics router ? when i try to configure it manually , i change the internet type to PPoE protocol but i can't find VCI/VPI so where are they ?
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May 4, 2013
I have a Linksys X2000 modem. Sometimes I see the "Wi-Fi Protected Setup" button glowing orange (amber?) for no apparent reason. The manual says that it "blinks rapidly in amber if an error occurs" but I don't think any device is trying to connect wirelessly at the time. How can I determine if there is a problem?
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Aug 28, 2012
Yesterday I bought the Linksys Wireless-N Home ADSL2+ Modem Router WAG120N (Annex-A version). I configured the modem/router and it was working very well. Today I was surfing the internet just fine and I left my computer for a few minutes, when I came back I noticed that there is no internet connection. The internet light on the modem was no longer on, and the DSL one was blinking. I turned off the device and then turned it back on but the issue was still present. I tried restoring the factory default settings and configuring the modem again but nothing seems to work (resetting the modem, turning off every device connected to it and restarting the modem/router). The DSL light keeps blinking, turns off for a couple seconds and then starts blinking again. The internet light only appears when I restart the modem and it flashes red just after turning the device on.
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Nov 20, 2011
I have a DIR-655 Rev B, in a typical cascaded config: modem > dir-555 > switches & devices, etc.One of the four dir-655 ports is connected to a cheap-o Belink Wifi router which I use as an access point (I only use this because there's one device that only supports WEP). I was debugging a WiFi issue and I pulled the plug on this Belkin just to get it out of the picture. Well, when I did that, EVERYTHING that was connected through the DIR-655 lost connection. (Well, all the wired stuff anyway- not sure about WiFi devices through the DIR-655). I noticed that the port link light for the powered-off device stayed on on the DIR-655. When I unplugged the cable from the DIR-655, everything went back to normal.
So what I'm trying to figure out now is, is this a DIR-655 issue, or is it something screwy with the Belkin? Or Both? I've got to assume that there's some inherent flaw in the DIR-655 that allows something connected to a port to screw up everything that it's hosting.
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Jan 6, 2012
Any way to fiddle the X3000 to blink the Internet light to show dsl activity?
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