Cisco Switching/Routing :: WS-C3750G-24TS-S1U High CPU Utilization In 3750 Switch Stack

Jan 30, 2012

WS-C3750G-24TS-S1U switch stack with high CPU utilization. 3 switches are stacked and using PBR on that. I am attaching the show cpu process as an attachment.The current template is "desktop routing" template.The selected template optimizes the resources in the switch to support this level of features for 8 routed interfaces and 1024 VLANs. [code]

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Cisco Switching/Routing :: 3750 Stack - High Memory Utilization?

Jan 21, 2012

I have a new cisco 3750 stack comprised of 8 members (6 x 3750G-48PS and 2 x 3750V2-48PS) running 'c3750-ipservicesk9-mz.122-58.SE2.bin'. I am seeing high memory utilisation, it seems to sit fairly stable and I do not see an increase but this has only been running a few days. No errors or performance issues. Should this be a cause for concern?

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Cisco Switching/Routing :: WS-C3750G-24TS-1U Stack Crashed IOS Version 15.0(1)SE

Nov 2, 2011

I have a situation. I am running two-switch 3750-stack and it crashed this morning. IOS version the switches is: "flash:c3750-ipservicesk9-mz.150-1.SE.bin"
Log Buffer (10000 bytes):
3:40.840: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan104, changed state to up
Nov  3 13:13:40.840: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan201, changed state to up
Nov  3 13:13:40.840: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan202, changed state to up
Nov  3 13:18:13.336: %PLATFORM-1-CRASH(code)

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Cisco Switching/Routing :: High Utilization On 3750x Switch Stack?

Feb 25, 2013

i am seeing very high utilization on a random basis on the stack. and the logs indicate me that there is a pattern where there is a stack power cable shows inserted (which was never unplugged) followed by sudden spike in the utilization.
001018: *Mar  6 16:21:22.138: %PLATFORM_STACKPOWER-6-CABLE_EVENT: Switch 4 stack power cable 1 inserted
001019: *Mar  6 18:18:37.982: %SYS-1-CPURISINGTHRESHOLD: Threshold: Total CPU


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Cisco Switching/Routing :: High CPU Utilization In 3560G-24TS

Jan 2, 2013

getting CPU utilization around 62% 
CPU utilization for five seconds: 54%/6%; one minute: 61%; five minutes: 61%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
35 82081 9642 8512 0.31% 0.21% 0.18% 0 Compute load avg

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Cisco Switching/Routing :: High CPU Utilization In 3750 Switch

Oct 19, 2012

In Cisco 3750 facing high CPU utilization for specific period. During this period traffic response times across the switch degrades. Steps to identify interface potentially generating traffic. I have attached 'sh proc cpu history' , ' sh ip traffic', 'sh proc cpu sorted'  during troubled period .

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Cisco Switching/Routing :: High Memory And CPU With 3750 Stack Switch?

Dec 26, 2012

We are having 3750 Stack switch as our edge switch. Here we are having some issues as low memory & itermediate High CPU utilization.For memory when we checked its shwoing maximum memory is allocated to DHCPD receive & ARP Input as follows
Processor Pool Total:   70829380 Used:   56809532 Free:   14019848
      I/O Pool Total:   12582912 Used:    8554920 Free:    4027992
Driver te Pool Total:    1048576 Used:         40 Free:    1048536


i want to understand why this 2 proceses (DHCPD & ARP input) taking more memory?High CPU: We also facing intermediate high CPU utilization (above 95%). When CPU is high there were 2 processes consuming more CPU are 'Spanning Tree' (about 20%) & ARP Input (about 66%). we also checked the ARP entries, there were 1500 ARP entries & 2 incomplete ARP (out of 6000 ARP supported)

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Cisco Switching/Routing :: WS-C2960S-24TS-L / Switch Version Compatibility In A Stack

Dec 19, 2012

We have the following stack configuration: 

Switch Ports Model              SW Version            SW Image------ ----- -----              ----------            ----------      1 28    WS-C2960S-24TS-L   12.2(55)SE3           C2960S-UNIVERSALK9-M     2 28    WS-C2960S-24TS-L   12.2(55)SE3           C2960S-UNIVERSALK9-M     3 52    WS-C2960S-48TS-L   12.2(55)SE5           C2960S-UNIVERSALK9-M *    4 52    WS-C2960S-48TS-L   12.2(55)SE5           C2960S-UNIVERSALK9-M 

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Cisco Switching/Routing :: Ws-c3750g-48ts / Adding Switch To Stack?

Jan 23, 2013

We have a cisco stack with 5 ws-c3750-24p 12.2)55)SE3 c3750-ipbasek9-m switches. Can i add a switch to the stack that is the following model: ws-c3750g-48ts 12.2(25)see3 c3750-ipbase-m

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Cisco Switching/Routing :: 3750 Stack CPU Utilization?

Feb 20, 2013

i have two cisco 3750 in stack firts, master switch have all swports busy second have only 5 how can i see cpu utilizations of the second switch, and its reasonable to move somme devices from first switch to second for deacreases of cpu and memory utilisatio ns of the master? the stack tehnologies use both cpu as one? or its only for simple management ?

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Cisco Switching/Routing :: High CPU Utilization On 3750 - PID 296?

Apr 24, 2013

I've been looking at reported problems with our Vdeio Conferencing kit attched to a stack of 3750's (which I think is down to QoS) but this got me looking at the logs. We get a lot of high CPU utilization warnings mainly for SNMP (315), Hulc running con (95), Virtual exec (289). I understand the last two are normal, and the SNMP one is probably Cisco Works polling as it happens every 4 hours.
However I've got an odd one: Apr 25 07:34:58: %SYS-1-CPURISINGTHRESHOLD: Threshold: Total CPU Utilization(Total/Intr): 93%/0%, Top 3 processes(Pid/Util):  296/85%, 144/0%, 154/0%
What is Pid 296? It's not listed on the switch:
293       39056     18456       2116  0.00%  0.00%  0.00%   0 SpanTree Helper
294           8        73        109  0.00%  0.00%  0.00%   0 EEM Server
295           0         2          0  0.00%  0.00%  0.00%   0 EEM Policy Direc


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Cisco Switching/Routing :: WS-3750 - High CPU Utilization

May 3, 2012

I have some events where the CPU utilization in a cluster switches of WS-3750 is going to 100%, the process with the major utilization of CPU is the "hulc running con".

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Cisco Switching/Routing :: High Memory Utilization SW 3750

Sep 6, 2012

I have a Switch WS-C3750E-48PD-SF with IOS 12.2(58)SE2 which reports more than 80% in utilization of memory I don't know what is causing the high memory utilization.

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Cisco Switching/Routing :: Upgrading WS-C3750G-24TS-E1U To 15.0.1-SE2?

Feb 17, 2012

I have the following switch:

#show version
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(52)SE, RELEASE SOFTWARE (fc3)
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Image text-base: 0x01000000, data-base: 0x02C00000
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

I have downloaded c3750-ipservicesk9-mz.150-1.SE2.bin and I want to upgrade iOS to this image.
I have a few questions related to this:
1. Is my switch model compatible with this iOS version?

2. Do you recommend the upgrade? Does it bring some notable features?

3. Can I upgrade for free or do I need to buy some license?

4. I also want to upgrade/add the crypto image, can I add crypto for free or some license is required?

5. I have remote access to my switch via the console cable which plugged into machine1. But machine1 is connected to network via the same switch. I am accessing machine1 via SSH, and then the switch via console cable (minicom on CentOS). Is there an upgrade procedure for this kind of situation that also has some fall back (like reboot in X minutes and load the previous image) if the upgrade goes wrong?

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Cisco Switching/Routing :: 3750-24TS-E Switch IOS And Hardware Version Compatibility

Nov 15, 2012

I am confused about some things regarding the different IOS versions and their compatibility with certain switch hardware. I understand the differences between the IPBASE and IPSERVICES ios but am not quite clear as to how you can tell which ios images will work on which Cisco switch model platforms, other than the fact that some switches are designed only to run the IPBASE images and others have advanced hardware to run the advanced images. For instance, if I have a 3750-24TS-E with an IPBASE ios on it, can I load an IPSERVICES ios that came from say a 3750G-24TS-E1U? whether the ios on one platform can be transferred to another?

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Cisco Switching/Routing :: WS-C3750G-24TS-S1U Slow Response Between VLAN’s

Jan 20, 2013

Inter-VLAN applications are slow and same VLAN it is working fine.(i.e.VLAN to VLAN applications and File transfer response was Slow).Switch Model number: WS-C3750G-24TS-S1U

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Cisco Switching/Routing :: 3750 Stack With High CPU (IP Input)

Oct 1, 2011

We added Site02 for redundancy and DR. Also added new SAN and ESX hosts. The CPU on device Site01Server01 is not very happy when files are being transferred between the sites. Since the setup is the same at both sites, why is the problem only at site01?
Site02 is newer and we have two 3750X-24 with IOS 12.2(55)SE3 on ipservices, for site02server01; no problem.
Site01server01 is a stack of two 3750G-24PS with IOS 12.2(58)SE on ipservices.


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Cisco Switching/Routing :: 3750G (WS-C3750G-24TS-E1U) - Fiber Module Options?

Mar 17, 2012

Got 2 of these switch stacked and there is some changes that we are going to undertake which will require us to utilize the whole 8 or 4 (2 from each switch) SFP ports. Just need some adivce on which particular fiber modules should I procure. Does this switch support 10GB of SFP ?

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Cisco Switching/Routing :: WS-C3750G-24TS / RSPAN Session For VOIP Recording?

May 9, 2012

we want to record voip telephone?Presently im using wireshark on a laptop to test the rspan session
Here is how it's configured
Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 28    WS-C3750G-24TS     12.2(52)SE            C3750-IPBASEK9-M
     2 52    WS-C3750G-48TS     12.2(52)SE            C3750-IPBASEK9-M

Ive created the vlan 33 on my core switch and  remote SPAN VLANs 133 Core switch is vtp server so i double checked on all switch and vlan 33 and 133 are present When i listen to conversation with wireshark we are only recoding voice of the one who is answering and we don't hear the other person talking?

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Cisco Switching/Routing :: Can TCAM Memory Cause High CPU On 3750 Stack

Sep 12, 2012

We have a 3750 stack with a mix of 3750G and 3750X switches. The current active template on the switch is desktop default and we are running EIGRP on the switch with large routing table so we get the TCAM error that a specific prefix cannot be programmed in TCAM memory so it will be software forwarded.%PLATFORM_UCAST-4-PREFIX:  One or more, more specific prefixes could not be programmed into TCAM and are being covered by a less specific prefix, and the packets may be software forwarded
This error is quite frequent on a daily basis. My question is that will this error create a high CPU situation and affect traffic processing on the stack causing ESX Hosts to become unresponsive? 

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Cisco Switching/Routing :: High CPU Utilization On Switch 2960?

Feb 16, 2012

I am a new network engineer on a retail company and I am having a problem on the High utilization of my 3-stack switch 2960 only during Peak Hours of the Store Sales.
Note: on Peak hours, it is peaking at 90-95 %
here is the utilization after Peak hours:


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Cisco Switching/Routing :: High CPU Utilization On 4006 Switch CAT OS?

Sep 5, 2012

I have been facing High CPU Utilization issue with few of my Cisco 4006 Switches together from last one month. Out of which 1 switch issue sorted out auto after 2 days however the problem is still exists with rest 3 switches.They are 6-7 year old and having one SUP engine and other are switch port modules.

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Cisco Switching/Routing :: EWA14 - High CPU Utilization In Core Switch

Dec 20, 2011

I am experiencing high cpu utilization in my 4000 series core switch.
I checked the loggs. i saw some strange loggs.
Please see the below logs:


What is the "invalidsourceaddresspacket" ?
Is this is due to some virus attack or something?? Also one more thing this switch is the Active router in HSRP.

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Cisco Switching/Routing :: Very High CPU Utilization Core Switch 4503?

Feb 14, 2012

We  had a core switch(30 vlans) in our environment and it's noticed that  CPU utilization of the core switch is showing high during recent days. I  have checked logs and processes, but couldn't find the root cause. The  issue found only in the office hourly only(after that the cpu  utilization is idle and normal). I have already referred the following  link to troubleshoot the issue " [URL]
see the following outputs from the core switch
CPU utilization for five seconds: 99%/0%; one minute: 99%; five minutes: 99%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
  30   6687557041432420936        466 47.52% 47.10% 45.98%   0 Cat4k Mgmt LoPri
  55  30667074884269560256          0 45.36% 45.50% 45.85%   0 IP Input
  29  28552856922870089254          0  3.59%  3.50%  3.57%   0 Cat4k Mgmt HiPri

Note: Each Invalid source mac entry in each day from same port (above is the output after clearing logs before 3 days)
My queries regarding the issues are following
1) How can we find root cause regarding the high cpu utilization?

2) Is a single invalid mac address makes the cpu highly utilized for suppressing it?

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Cisco Switching/Routing :: High CPU Utilization On 4510R Switch With Dual SUP V -10G

Feb 14, 2012

We have a problem of igh CPU Utilization in Cisco 4510R-with dual SUP V-10G modules.
Cisco 4510R switch is the CORE switch and have 30 no's of VLans. It was running PVST/PVST+ previously. But Now we have migrated to MST. But after upgradation the CPU utilization reached alomst 98%.

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Cisco Switching/Routing :: ME3400 Switch High CPU Utilization Due To ARP Input

Sep 3, 2012

We have Cisco ME3400 switch, with configuration described below.
GE0/1 port is uplink:
interface GigabitEthernet0/1
description ***MATED-IUB_C&U-Plan***
port-type nni
switchport trunk allowed vlan 331,450,4085
switchport mode trunk
GEo/2 is configured as below:

interface GigabitEthernet0/2
description ***From NIB***
port-type nni
switchport access vlan 4085
We have also tried Loopguard feature enabled on all ports: but after some period same problem is repeated.
version information is below:
Cisco IOS Software, ME340x Software (ME340x-METROIPACCESSK9-M), Version 12.2(25)SEG3, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 25-Jul-07 22:56 by amvarma

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Cisco Switching/Routing :: 2960 - Switch Port High Utilization

Aug 16, 2012

In my network we use all cisco 2960 switches, problem is when someone copying  4gb data or high from one switch to another switch, by that time rto (Request time out) is coming.

1. when user 1 copy data from server ,at that time who is in switch2 behind like user2 ,he is getting problem like when ping to default-gateway,or rto is coming and network is very slow .
2. when i open sw2,sw1,sw3,trunk ports utilization is very high except sw4 to sw1 trunk ports,who behind sw4 like user4 ,he is not getting problem.
3.all switches trunkport in my network is faster ethernet and i have no option to connect trunkport to gigaehternet and ethernet channel.

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Cisco Switching/Routing :: C2960-24-TT-L - Switch Memory Utilization High After Upgrading IOS

Nov 8, 2011

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?

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Cisco Switching/Routing :: High Memory Utilization Of 3560 Switch After Upgrade IOS

Mar 5, 2013

I upgrade the IOS of my switch 3560 from   C3560-IPBASE-M), Version 12.2(25)SEB4,  To   C3560-IPBASEK9-M), Version 12.2(55)SE5 after that the utilizatio of the memory increase to 80% I attached the output of show memory statistics history

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Cisco Switching/Routing :: 3750 / Add A New Switch In Stack?

Jun 21, 2012

i want to remove an access layer 3750 48 POE master switch and replace with a  new 3750 switch in the stack. i want to copy the same configuration to new switch since the old switch is having POE issue and I got replacement of the malfunctioned switch. we have VTP domain is configured in the network...

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Cisco Switching/Routing :: WS-C2960S-24TS-L / Mac Flapping On Stack?

Feb 27, 2012

We have two switches WS-C2960S-24TS-L running in stack with running IOS c2960s-universalk9-mz.122-55.SE3.We have connected two checkpoint devices on Gi1/0/24 and Gi2/0/24 with a simple configuration:
interface range GigabitEthernet1/0/24, gi2/0/24
switchport access vlan x
switchport mode access
spanning-tree portfast
On the devices log we get the following message:

%SW_MATM-4-MACFLAP_NOTIF: Host 0000.0000.fe21 in vlan x is flapping between port Gi2/0/24 and port Gi1/0/24
The mac-address 0000.0000.fe21 is not found on any checkpoint interface. "Show mac-address int gi1/0/24 or gi2/0/24" does not show the correct mac-address of the checkpoint interface connected to the port, but instead shows 0000.0000.fe21.Is there a bug in the IOS, something wrong with the switch config or does it have something to do with the checkpoint config?

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Cisco Switching/Routing :: Stack Behaviour Of 3750 Switch

Nov 17, 2012

I configured 3750 A  switch with vlan 20 and its IP address default gateway was i configured 3750 B  switch with same default gateway and vlan 20 IP question is now when we stack it becomes single switch and now vlan 20 ip address is thats only IP i can see.So how does stack switch choose vlan 20 IP?Does it choose highest IP address between two switches if they have same vlan 20 as in my case?Also when i go to switch 3750 b by session command and do sh ip route  it does not show ip default gateway .Also it shows vlan 20 as admin down .

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Cisco Switching/Routing :: 3750-X - How To Shutdown Only Switch In Stack

Aug 11, 2011

I have a doubt. In my environment I have two Switch 3750-X in stack.

My question is: How to shutdown remotely only a switch in stack?

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