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 :: 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 :: Getting 3750X-48P-L High CPU Utilization?

Jan 31, 2012

We are facing high CPU Utilization on Cisco 3750X-48P-L without any traffic on it. find the attached log files for 2 separate 3750's stack, we have upgraded the IOS of SW2 from "c3750e-universalk9-mz.122-55.SE3.bin" to "c3750e-universalk9-mz.122-55.SE4.bin" but still we found the same issue with CPU utilization.

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Cisco Switching/Routing :: 3750X 24SE-12.2 (58) SE2 CPU Utilization High

Oct 9, 2012

We have just purchased Cisco 3750X 24 S switches (QTY 2), last week we put them in prodcution in simple Layer 2 mode. No Core, just act as Access switch in order to only check the performace and availibility of switches.
But strange thing I have noticed the highest cpu utilization, cpu sits on 13 to 14% and from historical logs it hit above 60%. I am confused what is happening. Remember to terminate copper connection we have inserted Copper SFP Modules on both switches.
Both switches connected on Layer 2 mode via trunk, in LAN environment we have here 7 3Com 2824 Management switches which are terminated on Copper SFP modules at Cisco 3750X 24 S. All 3Comm Switches uplink are terminated on Cisco 3750 Switch 1, another switch is idle. Whole setup is running on VLAN1 .
Also refer no port in TCP and UDP packets in show ip traffic. any abnormal condition you predict..basically, In near days we plan to make these switches as Core layer and run intervlan routing, HSRP/VRRP and OSPF. But in this cpu usage how we can go ahead until this resolved..

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Cisco Switching/Routing :: 3750g And 3750x High Memory Utilization?

Jun 11, 2013

We had a stack of 4 qty 3750g running IP base on ver 12.2.32, then installed a 3750x to the stack and upgraded the whole stack to 15.0.2 SE3. In doing so, we noticed that the memory utilization jumped from 60-70% to 83-84%.
We had the same issue occur when upgrading to 15.0.2 SE3 on another stack that was 6 qty 3750g running ip-services, but this one jumped to 90%.  On the 6 qty stack, we downgraded to 12.2.55 and the memory util went back down to 60-70%. 
On the mixed stack, we replaced the 3750x with another 3750g and downgraded the whole stack to 12.2.55, however, the memory utilization did not drop down.  As far as I can tell, no config changes have changed from the original IOS. 

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Cisco Switching/Routing :: 3750X Stack High CPU?

Dec 3, 2012

Seeing very high CPU on one of our 3750X stacks.  Usally its around 30% but recently its 70, 80, 90 or maxed at 100% during the main day.IOS version c3750e-universalk9-mz.122-55.SE1.bin.Has a ten gig uplink connected to a nexus 7k and another ten gig connected to another 7k.  Running Layer 3 and EIGRP on the 3750X.Is this normal for the CPU?

#sh processes cpu history                
90                              *****     ****
80                              *****     *********     *****


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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 :: High CPU Usage - 3750X Stack

Jun 19, 2012

We recently configured a stack of four 48 port 3750-x switches . We are noticing high CPU usage. "Hulc LED process" seems pretty high. This has coincided with VMware servers getting slow and non-responsive at times, perhaps a coincidence, not sure. Below I provided some outputs about how to diagnose it.

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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 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 :: Stack 3750G-12S-S With 3750X-48T Switch?

Apr 14, 2012

if we can stack the 3750G switch with a 3750X switch ?

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Cisco Switching/Routing :: 3750X - Single Switch Stack?

Mar 8, 2012

I have a 3750X 24 port switch (with NM-1G network module) running IOS 15.0(1). Is there any benefit or reason to plug in the included Stack Wise cable and loop it back to itself in a single switch installation?
I don't see any recommendation in the documentation. The data sheet indicates a single switch is a non-blocking device so I'd think there's no bandwidth advantage like there is when connecting an actual multi-switch stack and needing to close the loop for the full 32 Gbps stack bandwidth.

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Cisco Switching/Routing :: High CPU Usage In 3750X-24T-L Switch

Apr 9, 2013

The process "HL3U bkgrd proce" is causing high CPU usage issues in a switch 3750X-24T-L. The IOS is 15.0.2-SE2.
show platform ip unicast failed route and adjacencies displays a lot of entries, I've seen up to 1200.
After restart HL3U bkgrd proce takes around 10 - 20 % CPU, some hours later 99%.
A coupe of times we got logs like this:
%SYS-3-CPUHOG: Task is running for (2136)msecs, more than (2000)msecs (172/73),process = HL3U bkgrd process.
-Traceback= 0x1BE9C3Cz 0x27E103Cz 0x27E0F64z 0x50DCF8z 0x50DE98z 0x503BD0z 0x4F7718z 0x1FF0A18z 0x1F46DECz 0x1F4816Cz 0x1F48698z 0x1F499C8z 0x1FF15D0z 0x2000430z 0x1FF55B4z 0x1FF5FA4z


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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 :: 3750X Stack Power Limitation With Non-POE Switch?

Oct 28, 2012

We have 9 x 3750x switches with 5-nonPOE and 5-POE. There is a limitation with 4 POE per stack with Stack Power.
Can we combine all 9 to one stack since there are only 4 POE?
Or, is the 4-switch limitation applied regardless if they are mixed with POE and non-POE?

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Cisco Switching/Routing :: What Are Options Available To Add Cat3560 G Switch To Stack Of 3750x Switches

Sep 8, 2012

What are the options avilable to add a cat3560 g switch  to a stack of 3750x switches.?is there a connector avilable ?or is it possible to trunk via fiber ? cat 3560 has 4 sfps and 224 10/100/1000 ports with poe. cat 3750 stack has a 10 gb up link . What are the possible options?

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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 :: Configuring Stack-power On A 3750X Stack?

Oct 31, 2012

I have 3 switches in my 3750 X stack. I am getting the following error in the logs:  %PLATFORM_STACKPOWER-4-PRIO_CONFLICT: Switch 1's power stack has conflicting power priorities.  Not sure what I should do next. Below is my Stack-power configuration:
Power stack name: Powerstack-1    Stack mode: Power sharing    Stack topology: Ring    Switch 1:        Power budget: 735        Low port priority value: 20        High port priority value: 10        Switch priority value: 2        Port 1 status: Connected        Port 2 status: Connected        Neighbor on port 1: c464.1308.7900        Neighbor on port 2: e8b7.4827.e680
    Switch 3:        Power budget: 729        Low port priority value: 22        High port priority value: 13        Switch priority value: 4        Port 1 status: Connected        Port 2 status: Connected        Neighbor on port 1: 2894.0fd9.9f00        Neighbor on port 2: 2894.0fd8.e200
    Switch 2:        Power budget: 690        Low port priority value: 21        High port priority value: 12        Switch priority value: 3        Port 1 status: Connected        Port 2 status: Connected        Neighbor on port 1: 2894.0fd8.e200        Neighbor on port 2: c464.1308.7900
Each switch has its own 715W power supply in it and all check out OK.

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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 3845?

Mar 28, 2013

We have a Cisco 3845 router configured as a voice gateway with multi SIP trunks. But when it reachs 200 calls traffic, the CPU increase to 60-70% and caused by CCSIP_SPI_CONTROL process.

CPU utilization for five seconds: 46%/30%; one minute: 54%; five minutes: 58%
PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
377   400729448   171017979       2343  6.31% 10.71% 12.44%   0 CCSIP_SPI_CONTRO


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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 :: 6509 With SUP 720 CPU Utilization Is High

May 20, 2012

From couple of weeks we have observed the cpu utilization of cisco 6509 with SUP 720 is high. During daytime from 9:00 to 21:00 it keeps increasing & reaches 98% & after 21:00 becomes normal.

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Cisco Switching/Routing :: High Cpu Utilization On 7206VXR / NPG-1?

Mar 19, 2013

Cpu always hitting 70% to 80 % and interrrupt traffic is 70%. Want to know the root cause for this issue. 
CPU utilization for five seconds: 73%/65%; one minute: 71%; five minutes: 67%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
   1           8        59        135  0.00%  0.00%  0.00%   0 Chunk Manager   
   2       58864   3290773         17  0.00%  0.00%  0.00%   0 Load Meter      
   3        1784    238001          7  0.07%  0.01%  0.00%   2 Virtual Exec    


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Cisco Switching/Routing :: WS-C6509-E High CPU Utilization

Jan 13, 2013

I have a 2 cisco core (cisco WS-C6509-E (R7000) processor) and been working for quite sometime.they are conneted with HSRP with active standby config with a 10 g module for redundancy just today I see that the cpu utilization went to about 50% and its the same on both cores.

[Code] .......

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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 CPU Utilization On 2960S?

Feb 8, 2011

We have seen high CPU utilization on some Cisco switches of type 2960S. Also we got info, that applications are running with poor performance or with interruption.Following IOS is loaded: C2960s-universalk9-mz.122.55.SE

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