Cisco Switching/Routing :: CRC And Input Errors On WS-C2960-24TT-L?
Jul 1, 2012
I am not sure why the CRC and input errors are increasing in fastethernet port...This port is used as Intradomain cross connect to Data Center service provider for LAN extension between two Data Centers in different locations... The link is 100 MB. The switch port is directly connected to patch panel of DC provider and I believe they have some L3 switch or some other device that is providing LAN extension...
#sh interfaces fastEthernet 0/23
FastEthernet0/23 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0019.3050.1497 (bia 0019.3050.1497)
Description: ASA_VPN_TO
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
[code]....
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Oct 2, 2012
I am not sure why the CRC and input errors are increasing in fastethernet port...This port is used as Intradomain cross connect to Data Center service provider for LAN extension between two Data Centers in different locations... The link is 100 MB. The switch port is directly connected to patch panel of DC provider and I believe they have some L3 switch or some other device that is providing LAN extension...
#sh interfaces fastEthernet 0/23
FastEthernet0/23 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0019.3050.1497 (bia 0019.3050.1497)
[Code].....
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Jan 29, 2012
I am having problem in upgrading Cat2960 because I deleted the flash in this switch already and now I need installing an IOS image? [code]
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Dec 15, 2012
does the WS-C2960-24TT-L switch support power over Ethernet ?
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Apr 16, 2013
We are facing since one month in our two Cisco WS-C3750G-12S on many interfaces input errors when data transer or ping (ICMP) increase input erros. Not only port 1 but many interface has same issue, i have change new IOS but still same issue, once i have erase startup config but same issue we are facing and finaly i have replace same new switch with the same IOS it's working fine.(c3750-ipservicesk9-mz.122-55.SE4.bin) [code]
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Mar 15, 2013
I have an ASR 1002x connected to a 6513. Connection is from ASR Gig Copper SFP to 6513 Copper 10/100/1000 port. The ASR is recevinig Runt and input errors. I have removed the negotiation auto command on both boxes and hard coded the speed etc and still errors occur. I have also added the negotiation auto to both devices and also removed it with out hard coding the speed at and same results. Everytime I have seen these errors is has been to collision caused by a duplex mismatch.
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Mar 11, 2013
I have an odd situation where I cannot get a device connected to a built in switchport with out input and crc errors. When connecting to a GLC-T sfp it works fine.Here is my test layout
Outdoor wireless AP --- 10' of cat6 cable --- Gigabit POE injector --- 10' Cat6 cable --- 3560G port 48. (input and crc errors)
When I do this there are input and crc errors on the switch port. This has been confirmed on three different switches and three different outdoor AP's. We though at first it was the injector, but when we run the same setup, but instead connect the device to port 49 with a GLC-T sfp there are no errors.
Outdoor wireless AP --- 10' of cat6 cable --- Gigabit POE injector --- 10' Cat6 cable --- 3560G port 49 (GLC-T). (No errors)
I have upgraded the 3560G to the latest ios and still it has the same problem. If I run the same setup to a 2960 there are no errors at all.
Outdoor wireless AP --- 10' of cat6 cable --- Gigabit POE injector --- 10' Cat6 cable --- 2960 port g0/1 (No errors)
I have also tried manually setting the speed on the 3560G with no success.
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Oct 21, 2012
I have been making effort to solve frequent input errors of module interface(WS-X4548-GB-RJ45) in our Backbone Switch(Cat4506).Let me show you show interface information.Rx-No-pkt-buff value is increased continuously even though traffic rate of interfaces is lower than 20Mbps.We have two Backbone Switch which is operated by HA via HSRP.What bring buffer shortage to our network ? [code]
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Apr 8, 2012
I want to know what is the different between IOS of the catalyst WS-C2960-48PST-S and the IOS of catalyset WS-C2960-48PST-L.a want to upgrad the IOS of a WS-C2960-48PST-S with the IOS of WS-C2960-48PST-L (because this reference has a LANBASE version of IOS).
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Nov 4, 2011
I use an 1841 router as an internet facing firewall with a 10MB MetroE connection. Lately users started reporting slow internet download speeds and web pages timing out. Bandwidth reports do not show the link as being saturated so I looked at the interfaces on the 1841. The interface connected to the provider shows OK as far as errors but the LAN side of the router shows steadily increasing input errors. It doesn't show any other errors, no CRC, frame, runts, giants or overruns, just generic input errors. What type of errors are those? Nothing is being logged on the console.
I moved the connection to another switch ports and the errors continue. I switched it down to 10MB and also changed the switch and the errors slow down but don't stop. Interestingly, the switch side never shows any errors. What can I do here? I guess it can be a bad interface but that is such a rare thing that I am hesitant to replace the router.
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May 11, 2011
My router, a Cisco 7204 with NPE 300, is experiencing output drops and input errors on a fastethernet interface. I have a 100Mbps connection with less than 15Mbps utilization at peak times.
FastEthernet1/0 is up, line protocol is up Hardware is DEC21140, address is 0014.a985.1a1c (bia 0014.a985.1a1c) Internet address is 38.102.66.134/30 MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 3/255, rxload 1/255
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Oct 21, 2012
I ran into a problem a few weeks ago and am still trying to figure out why either the 3560 switch or our Cacti syslog server did not alert us when one of our ports was experiencing heavy CRC and Input errors.
I had upgraded the IOS to 12.2(55)SE6 and rebooted the switch. About a week later, someone was troubleshooting why print jobs were having problems printing to a high speed printer. When I looked at the interface it showed a few thousand CRC and Input errors. I cleared the counters and had them print again and watched as the CRC and Input errors went up. When I did a "show log" there were no error messages. Looking at our Cacti Syslog there were also no errors present for the past 6 months.
We found that the device on the port was set to auto speed and duplex and the switch port was at 100/Full. Once we got them to match the problem was resolved, but we were left wondering why we never got any alerts.
We also have some 3548 and 3550 model switches that Cacti picks up %LINK-4-ERROR for any ports that show CRC and Input errors. I did some research and it appears that the 3560 switches do not have the LINK facility code. I believe it has been replaced with a PHY link code but I'm not sure. We do have some "%PHY-4-EXCESSIVE_ERRORS: Excessive FCS, data, or idle word errors found" but they are all for 3750 switches. I could not find any 3560 that had alerted for that error or the LINK error.
I also tripped port security on the 3560 switch just to make sure that it was reporting correctly to Cacti and that alert did show up.
My question is how do I get a 3560 switch to alert in the logging buffer for CRC/Input/FCS errors? Also, how I can generate CRC and Input errors on purpose for testing? I tried mismatching the speed/duplex/Auto and only got collissions, no CRC or Input errors.
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Feb 26, 2013
My Expertise with Cisco ASA is Very less. I have observed Input errors in a Couple of Interfaces in Cisco ASA 5540 Firewall. [code] I need to Clear the Input errors on this particular Interface.Will Clear interface GigabitEthernet 0/0 will work?
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Dec 5, 2011
I'm using a Cisco 1812 to route traffic from a small location with 10 users.. Users are complaning about packet loss, and programs with live database connection is freezing..On the router i've checked one of the Fastethernet interfaces, and I can see that the input errors are increasing constantly. [code]
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Nov 16, 2009
Why packets overrun are incrementing on the ASA even when I've only 40Mbps of throughput traffic?All interface are 1000- Full Duplex, both on ASA and on Catalyst3750.I've test the ASA5540 generating GET HTTP, about 40Mbit of traffic.When I use one ingress interface and one egress interface, interface input overrun counter is zero.When I use the same traffic with 3 ingress interfaces(slot0) and 3 egress interfaces(slot1), interface input overrun counter increase(60k overrun in only 2 minutes).
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Feb 22, 2012
I have this output from show interfaces command for the fastethernet interface on a 2811 router.
find the causes of the crc and the ignored input errors on the interface?
The interface configuration is:
interface FastEthernet0/0description VLANS_CHILE
no ip address
[Code]....
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Mar 1, 2013
After not seeming to be able to save any configurations in 12.2(25)FX, I thought an upgrade would work since it said it didn't recognize my browser or OS but let me continue. I was able to see everything just couldn't save changes.
I updated to 15.0(1)SE3 and everything seemed to be going well. Tried to log back in HTTP (have not set n IP yet since it is still at my house... DHCP seems to be working) and I get a user/password screen that says level_15_access and it won't let me in.
Attempts to log in terminal have been unsuccessful. I can log in my dell switch which I am replacing and my APC units terminal just fine using USB to serial and Ubuntu.
I tried cisco as a password, user and password, admin, administrator no luck.
What is the best way to resolve this, is there a sure fire windows serial program or settings I should use in linux (currently 9600,8,N,1) to connect? I have looked through manuals till I am blue in the face.
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Apr 10, 2013
I'm trying to do a Master reset on my Catalyst Express 500 (WS-CE500-24TT v01) and I'm having troubles with this. url...I do everything as it says, but when I plug the cable and I pull up the Web browser nothings appear, just the message that I don't have a Internet connection. The LED port on switch don't stop blinking as LED setup either. Is there another way to do the master reset?
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May 3, 2013
I am trying to configure 802.1x RADIUS Authentication on cisco 2950-24TT-L Switch. I am using following set of command as given below
Switch# configure t
Switch(config)# aaa new-model
Switch(config)# aaa authentication dotx default group redius
Switch(config)# dot1x system-auth-control
Switch(config)# inter fasteth 0/1
Switch(config)#dot1x port-control atuo
I am facing problem dot1x command is not working on interface.
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Jan 10, 2012
ws-c2960-24tt-L Ethernet switch adding or removing any device from switch cause a loss of connection to all other devices on switch for about 60sec.
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May 10, 2012
I have an issue with input errors, overruns, and input reset drops on the inside interface of an 5580-40 (v8.2.5: Transparent mode) The box is not stressed at all according to the 'show' commands in the Cisco troubleshooting performance document for PIX/ASA v8.2.5. Nothing stands out because is pretty much normal, nothing (processes, RAM, blocks, IO...) really being highly utilized. I have replaced the 10Gig card and that seemed to work because the rate of errors has gone down tremedously. The next step is to RMA the whole box.My question is what would be the cause of the inside interface to stop processing traffic (I say that because the syslog server stops receiving messages) for some periods of 30 seconds periodically throughout the day and clients lose their connections (ie Outlook, IBM Sametime, Oracle, MSSQL..etc). Can the issue be somewhere related to the overruns and input errors?
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Dec 26, 2012
We have a customer who uses about 20 x c2960's switches for access layer and 2 x c3560e for distribution layer. C2960's uses C2960-LANLITEK9-M , Version 12.2(58)SE1. Everything was working fine. Now we got information, that sometimes there are problems with connectivity. Customer tries to reach internet.
SW11#sh int fa0/18
FastEthernet0/18 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is e8ba.806a.4412 (bia e8ba.806a.4412)
[Code].....
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Mar 12, 2013
I am trying to configure RSPAN for one of my client. They have Server-Client VTP architecture. Voice Recording Server is connected to C4507. Agents are connected to C2960 and C3750. I got 2 sessions configured and the connectivity is a as follows:
1. Voice Recording Server-----C4507-----C2960-----C2960-----Agent IP Phones (Session 1)
2. Voice Recording Server-----C4507-----C3750-----Agent IP Phones (Session 2)
Recording works with Session-2 but not with Session-1. I understand the problem could be due to multiple reasons: 1.1. C2960 is working in client VTP mode so i cannot add remote span command under the vlan configuration. 1.2. C2960 has LANLITE IOS image which i am not sure if it supports Remote Span.
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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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Apr 26, 2012
I have two WS-C2960-24TC-L Switch with Software Ver 12.2(25r)SEE6 with image c2960-lanbase-mz.122-35.SE5.bin and 12.2(25r)SEE1 with image c2960-lanbase-mz.122-25.SEE2.bin currently on it.
I want to enable SSH connections on the switches and believe I need to import the cryto image onto the switch. I would like to upgrade it to new version that can also support ssh connection but not sure which image to download from cisco. The switches are now live.
System image file is "flash:c2960-lanbase-mz.122-35.SE5/c2960-lanbase-mz.122-35.SE5.bin"
cisco WS-C2960-24TC-L (PowerPC405) processor (revision H0) with 61440K/4088K
[Code].....
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Feb 7, 2012
I've got a C2960 (sw01) and a C2948. (sw02) The sw02 switch is trunked with sw01, and is meant to serve as an extension to the VLANs (1-4) that exist on sw01. It is trunking properly, however, how would I go about giving the sw02 an IP so that I can access it via SSH? Would I have to create a VLAN specifically on sw02 with an ip and switchport an interface to use it? I know that a VLAN can only have a single IP, but I'd like sw02 to have an IP on VLAN1 (192.168.1.0 subnet), is that possible?
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Feb 14, 2012
i am trying to upgrade the firmware in my C2960 switch to 15(1) SE2, and i get the error:Failed to execute the command archive download -sw /overwrite /http iosFile
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May 19, 2013
I have an issue with one of our switches, switch model WS-C2960-24TC-L, i am not able to display switch temperature as below,
Switch#sh verCisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 15.0(2)SE2, RELEASE SOFTWARE (fc1)Technical Support: URL ) 1986-2013 by Cisco Systems, Inc.Compiled Tue 05-Feb-13 12:41 by prod_rel_team(code)
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Jan 8, 2012
We just purchased (3) WS-C2960-24CT-S and (1) 3750G, what's the proper way to cascade this switches? Do I need to use crossover cables from port to port? Do I need to change the mode for the ports to use?
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Nov 9, 2012
I am facing high memory utilization in Cisco 2960 switch having IOS version 12.2(55)SE3.
The error we are getting is:
A "LiveHealthAlarm" event has occurred, from SwCiscoIOS device, named Switch2960. eHealth Alarm Start Time - Fri 09 Nov,2012 - 03:02:48 eHealth. Switch2960-RH-MemoryPool-Processor-Processor-1.Memory utilization high-Threshold set at 70%SPECTRUM ALARM ID|22233284 I have attached the logs also.
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Dec 7, 2011
I am trying to get a C2960-8tc-L linked to a sge2000p via the Gbic ports using GLC-SX_MM gbics but having no luck.Are these compatible and should I need to configure anything?
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Aug 14, 2012
Yesterday I tried to install c2960-lanbasek9.mz.12.55.SE4.bin onto my router. When I changed the boot commands, I did not leave the 2nd option in there and the old firmware has an .ex3 extension. After trying to boot to this new image, we receive a looping error message that continues to reboot and go through the same process.Basically the error is "ERROR: firmware not supported by hardware"I have power cycled it a few times but durning bootup, I never see the ################## which would allow me to BREAK sequence and get into rommon. The device simply waits about 30-40 seconds after boot and goes right back to the looping reboot sequence and the error message. Is there any hyper term or putty settings to change on this?
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Sep 15, 2008
I'm trying to configure the GigabitEthernet interface of the WS-C2960 switch to have a full duplex. Unfortunately, there is no option to configure this neither is the speed of that interface. But these options are present in FastEthernet ports. Is there a bug in SW version 12.2(35)SE5 that explains this abnormality?
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