Cisco Switching/Routing :: 3850 System LED Blinking Fast - Not Getting Past POST?
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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Aug 1, 2012
I have a problem with a catalyst 3508G XL ...
The problem is as follows:
When I power on the system LED keeps blinking and does nothing.I've tried connecting the cable to the console port, but can not communicate.
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May 20, 2013
3602I constantly shows a fast blinking green light, watching the boot up I see the following:
Loading "flash:/ap3g2-k9w8-mx.152-2.JA/ap3g2-k9w8-xx.152-2.JA"...uncompress: Unknown mzip segment type: 2
Error loading "flash:/ap3g2-k9w8-mx.152-2.JA/ap3g2-k9w8-xx.152-2.JA"
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Apr 23, 2013
Can the new Cat 3850 run MPLS ?
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Jan 28, 2013
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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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Apr 23, 2013
I have a C2960-24TT-L Switch with the following problem:When the Power Cord is plugged in the Switch, all switch indicator LEDs go on very briefly. Then SYST LED blinks very briefly, goes on steady and remains at this state without any indication at the console.Tried the reset by holding the MODE button while plugging in power but I still get no indication at the console. All is fine with console, meaning that if I take out the cable and plug it in another switch, then I see all that there is there to be seen.My question: Is the switch beyond repair or is there something that can be done to get the switch to run POST and boot at rommon so that I can reload SW and configs?
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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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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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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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Jun 5, 2012
I have a Cisco CBS3020-HPQ chassis switch running IOS 12.2.(25r)SEF3. One of the ports is in "disabled" state but when I try to unshut it, it doesn't work, the switch logs shows the following event:
%PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi0/1 can't be brought up because it failed POST in Loopback test
how do I resolve this, the port is unusable since I can not get it out "disabled" state.
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Feb 16, 2013
I have 2 - WS-C2960-24TT-L switches. Both are experiencing the same issue. Upon booting them up, all lights flash on the mode indicator panel, then it goes directly to a solid green "SYST" light. Nothing registers across the console cable. I have tried different baud rates, cables and computers. None of the ports come up regardless of how long either switch is powered on. Holding the Mode button during boot up produces the same result, nothing. Sounds like they are dead, however, I thought this would be the place to go for ideas. Can I revive these switches?
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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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Apr 17, 2013
Command to check system status of ACE 4710 appliace? For example if fan is OK or CPU temperature, or other HW things what could be faulty?
For example now I have system ID button blinking amber bot do not know what is wrong. I just know that there is some faulty.I just used show tech-support command and it does not seems that it include some HW statistics.
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Dec 5, 2011
I am trying to configure a 3750G that has been sitting on the shelf for several months and am getting the following error -
% Error: Unable to create flash:/microcode_update% Error: It must not already exist
Normally, getting an error during POST isnt a good thing. My first thought was that flash was corrupted or flagged RO somehow. I did fsck flash: with no change. I next tried fsck /test flash:. It tested 77 blocks and performed 0 erasures. It had been running for about 15 minutes with no problems reported so far. Multiple reboots of the switch still report the same error.
I have reviewed the history of what I have done on this switch and finally think I found the problem. I noticed a microcode_update directory that I am not used to see on a 3750. Deleted the directory using the rmdir command and rebooted the switch. On reboot, I noticed that a front_end/ directory was listed as being created as well as fe_type_1 and fe_type_2 were created. The switch now boots up without any errors.
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Dec 10, 2012
Which is the best routing method for PBR? is it fast switching? If it is, how can I enable It in my 3750?
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Aug 11, 2008
I am having a heck of a time finding information on this. I have a 2620xm router that only has one Ethernet port on it. Is there an expansion I can get that allows me another Ethernet port. I have thus far assumed that all of the WIC cards won't allow me to attach to an Ethernet LAN.
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Sep 5, 2012
I've got LACP-enabled port-channels between a Cisco 3750 stack and a few different switches (some Cisco 3750s and some Juniper EX2200s). The Ciscos are all sending slow LACP updates, the Junipers are sending fast LACP updates (but the Cisco they connect with is responding with slow LACP updates).
I have a couple of questions:
1) what are the pros and cons of slow vs fast updates? my research has led me to the conclusion that fast updates are better for network resiliency as long as you have plenty of bandwidth overhead (which I do at the moment). is there anything to add to this conclusion?
2) is there any way to configure the Cisco 3750s for fast updates?
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Jul 15, 2012
I have 2 new 3750g devices in a small environment. switch1 acts as our collapsed core and has ip routing enabled, and is connected to a ASA 5510. There are 3 HP l2 switches connected to switch1 as well. switch2 is simply a server switch. switch1 and switch2 have a 2port etherchannel between them, and a vlan trunk carrying 4 vlan's. traffic between any 2 hosts on switch2 (same vlan) are slow. (average 300Mbits/sec) If I move one of those hosts to switch1, speeds increase by 3 times. (average 900 Mbits/sec). Additionally, traffic between any 2 hosts on switch1 are quick. testing is done with iperf as well as timing 1gig file transfers.
I don't see any errors or drops anywhere, and there are no other symptoms other than slow transfer beteween hosts on switch2. I just got 2 more of these 3750's to put in a 2nd site that we have, put a quick configuration on them, and have the same result. Other than switch1 having ip routing enabled, the configs are pretty much identical.
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Apr 24, 2012
I have cisco 1801W . Earlier I am using ADSL dynamic IP address on RJ 11 through the ADSL Port but now the ISP change the connection to RJ45.
I am trying to configure it but unable to do this. ADSL line is okay because When I am connecting through the ISP router it is working fine. I have connected the ADSL RJ45 cable in the router fast ethernet 0.But I wanted to use Cisco 1801 Router so that I can use the ADSL as primary and ISDN as the backup.
Below is my configuration, eiteher this is possible to configure ADSL through RJ45 in 1801 and what configuration require for this.
Router#show ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0 unassigned YES DHCP up up
BRI0 unassigned YES unset administratively down down
BRI0:1 unassigned YES unset administratively down down
BRI0:2 unassigned YES unset administratively down down
[code].....
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Jan 2, 2013
My access switches LED is start blinking very fast suddenly,it has single up link from the Core switch.access switch is 3560.what can be the possible problem.
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Dec 24, 2012
I am running the latest version of 12.2(55)SE6 on the catalyst and I am looking for this command "lacp rate fast" but it is not there:
lab-c3750#conf t
Enter configuration commands, one per line. End with CNTL/Z.
lab-c3750(config)#interface g1/0/5
lab-c3750(config-if)#lacp ?
port-priority LACP priority on this interface
lab-c3750(config-if)#lacp
According to this link, it is supposed to work: [URL]Am I missing something?
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Jan 21, 2013
We recently installed 15 of these switches, and we're having a few odd, random network issues. But before I enumerate those issues, I have a simple question: are the connection lights on these switches *supposed* to blink rapidly? Or are they supposed to blink *normally*?On all other switches I've ever seen / worked on / worked around, when a cable is plugged into a port, the connection lights blink upon network activity. sometimes they blink a little faster when there's lots of activity, but mostly it's an almost lazy, random kind of blinking. When you look at a switch and every light on every port that's connected is blinking very rapidly, your first instinct is "No *wonder* nothing works around here!" and you find the port that's chattering and unplug it...all the blinkies go back to normal.Well, on the 15 switches we've installed, every light that's on blinks rapidly, as if there's an uncontrolled storm going on. Is that the "new norm"? Did I miss the memo, and there is nothing to be worried about here? Or are the rapidly blinking lights telling me there is, indeed, a problem?
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May 19, 2013
SW1#show interfaces fastEthernet 0/14 counters errors
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
Fa0/14 6682 140364 0 306468 0
Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants
Fa0/14 0 0 0 0 180103 0 2798
[code]....
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May 28, 2011
I'm learning about iptables, but I don't fully understand the chains of NAT table (prerouting, postrouting and output).I'm specially in doubt about prerouting and postrouting. As far as I know, DNAT can be made with prerouting and SNAT can be made with postrouting, so I think prerouting is for input and postrouting is for output, but the material I'm reading (and another sources) are not clear.
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Oct 8, 2012
I have 4 cisco 2960 switches to which many users are connected. No vlans are the only default vlan 1 is there. Now I want to make ether channel on switch 1 whcih has 24 fast etherenet ports. Can I make port 1- 8 as one ether channel which are connected to users or i can only make ethere channel of ports that are connectd to other switchs. If I can, how the other switchs will comnicate with the switch ports bundalled in the ether channel in switch 1.
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Sep 10, 2012
I would like to know if Catalyst WS-C3750G-48TS-E recognizes and understand Cisco VSS ( Virtual Switching System) . Is there a List available which tells us which Old Catalyst Switches or current switches understand Cisco VSS?
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Apr 29, 2013
I'm using "WS-C4948(12.2(54)SG)+PWR-C49-300AC/2". The following message are logged in the system log, but it was to check the status with the show command and status LED, but there was no abnormality. I thought the power supply has failed, but I seem different.
040861: Apr 27 07:00:50: %C4K_IOSMODPORTMAN-4-POWERSUPPLYBAD: Power supply 1 has failed or been turned off
040862: Apr 27 07:00:50: %C4K_IOSMODPORTMAN-4-POWERSUPPLYFANBAD: Fan of power supply 1 has failed
I checked.>> #show environment alarm no alarm
#show environment status power supply
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- -------
PS1 PWR-C49-300AC AC 300W good good n.a.
PS2 PWR-C49-300AC AC 300W good good n.a.
All Status LEDs are green.
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Mar 25, 2012
I am trying to configure BGP on 6509 IOS. I can not specify a long interger for autonomous system: ASN: 262829 (32 bits)
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