Cisco Switching/Routing :: Why C2960 Is Dropping Packets
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)
I recently installed DHCP snooping on a 3750v2 switch (Version 12.2(55)SE4) and configured the uplink(Po2) as a trusted port. The problem is that clients cannot receive an IP address. When I disable DHCP snooping it is working properly. DHCP snooping is configured correctly but I don't have an idea how to resolve it. [code]I tested the solution on the same kind of hardware switch and firmware and it worked out fine. What is causing the clients not to receive an IP address from the DHCP server?
We have a remote site that is using 3750X switches as layer 2 switches back to our home site. The uplink port is showing dropped packets but the utilization on the link is never about 10%. We have a 100Mb circuit to this site. Our speed tests and iperf tests are not showing any issues that we can see. However the port is still droping packets. It is not dropping at a high rate but they are dropping.
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).
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.
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?
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
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?
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
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,
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)
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?
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.
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?
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?
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?
I have an inquiry about a configuration I deploy in a C2960 switch. I have configured a ether channel with 8 ports, the load balanced method is source mac address. The bundling protocol is LACP.
I have found the ether channel is not balanced as I expect. One of the eight interfaces is congested.
Customer has a Catalyst WS-C2960-48PST-L. and in some ports we have VoIP phones with PoE company Aastra. If I use first config we have problem when phone boot up.
The MAC shown here is from a voip Phone. After the phone boot up, the p, because it must boot first in vlan 250 (access vlan). On the port you can only see the MAC from vlan 201. With the second config the phone can boot without problems:
Switch A is: WS-C2960-48TC-S Switch B is: SG 300-10MP
Neither switch supports a similiar transceiver module. We are looking at transceiver GLC-SX-MM for Switch A, and MGBSX1 for Switch B all the Layer-1 information (SX / wavelength, Multi Mode, etc.) I am able to find out about the two transceivers seems to match, so would there be any issue by having these 2 "different" transceivers at either end?
Is it possible to configure both Catalyst WS-C2960-24PC-L and Switch Cisco SG300-28 to work together for VLANs for voice and data ? If yes, can you give me the resources which I can refer to ?
A quick one because I'm scratching my head trying to figure the difference between the 2960 LAN Base and LAN Lite IOS installs. I want to put a 2960 into a site which has as layer 2 link on dark fiber taking it elsewhere. This part I'm not concerned about - the WS-C2960--24TC will do what I need without issue - but I don't know if I can get away with LAN Lite, or if I need LAN Base.
I basically need V LAN's with associated SVI's, and a routed link on the up link port (I don't care if it's a switch port with an associated SVI or a no switch port and IP address), but it's got to be able to run OSPF. Can I do this with LAN base on this series switch? Or do I need to go for a higher series (3560?). I *could* get away with static routes, but my boss is walking death on them unless I can 100% prove they're necessary, so I'd rather not right that fight!
I upgraded the newest IOS 15.0(1)SE for our SW C2960-24-TT-L, the process was succeseful. However, we found SW memory utilization raised to 82% this morning in normal situation. (Momery: Total 21341260, Used17471692) Did you guys meet the same problem after upgrading to 15.0(1)SE? I also would like to know what the normal memory utilization is? and what is the impact of memory utilization highly?
I have a cisco2960 with c2960-lanbasek9-mz.122-50.SE4 imagebase.This switch is connected with 3 unmanaged switches.Though 2960 is managed and only a single vlan is given accessed to connected other unmanaged switches.Problem is this, if at user end, a laptop is connected ( Microsoft Vista OS) and its IPv6 is checked in the LAN properties settings then the laptop's IP address changed from our VLAN to 192.168.100.x series and due to this other connected user's DNS addresses become changed.Hence I want to block this IP or its MAC on Cisco 2960.
I enabled the "no service password-recovery" command on my C2960 switch. All seems to work as discribed. Only issue I have is --- which show command is used to reveal if the password-recovery feature is enabled of disabled as the command doesn't show up in the running config after you enable it ?
NOTE: The command does show up in the C2960 switch in config t mode (unlike the IOS router 2800 series), but doesn't show up in the running-config after you enable or disable it.
On the 2800 series routers (latest IOS) in config t mode the command does not show up but if you type "no service passowrd-recovery" the command function correctly and it does list it in the running configuration.
I am begining to work to apply Qos on switchs (C2960 & C6500), and I still have a doubt about the necessity to consider the cos value. I indeed want to apply Qos for ToIP, Video, perhaps create a scavenger class, ans in all cases, I classify my packets with TCP/UDPB port and mark them with DSCP. So is it really necessary to study all the DSCP/CoS mapping problematics ? Is it not possible to make the configurations only on the base of the DSCP field?
WS-C4507R-ECat4500 E-Series 7-Slot Chassis, fan, no ps, Red Sup CapableWS-C2960S-24TS-SCatalyst 2960S 24 GigE, 2 x SFP LAN LiteWS-C3750X-24T-SCatalyst 3750X 24 Port Data IP BaseGLC-LH-SMGE SFP, LC connector LX/LH transceiver
The current situation that all existing Fiber Patch Cords cables & fiber cables coming from field are multimode. So, I think we have a compatibility issues. We need clarifications from your, what are the options that we can do to resolve this issue.Can we connect the above switches to multimode Fiber Patch Cords cables?
in a customer project we are evaluating if it's possible to connect from cisco ios switches via "ssh -l <user> <ip address>" to an enterasys n series dfe modul which is running a ssh server v2.
Unfortunately this doesn't work as expected, every connection attempt is resetted.We did a trace of the ssh connection attempt where you can see that there is some problem in the algorithm negotiation (see attachment).
I have a 512MB USB Flash device and was able to boot the IOS on the C2960 from it.After that i tried to Copy the IOS file from the USB to the system flash, but it could not find the USB Device.At plugging in the device the systems tells me: "Transfer type 2 not supported" I configured the USB device in NTFS and FAT both are able to boot with the ROMMON, but the normal system does not accept them and i know i can do the copy over a TFTP from my laptop, but it is strange that rommon accepts the usb device and the system does not?
