Cisco WAN :: High CPU On 3750 Stack?
May 1, 2011
I have been seeing high CPU on a 3750 stack we use for our phone system. I followed the documentation here:
[URL]
This documentation pointed out that the interrupt was very high and so I started looking at the CPU queues to debug. The icmp queue was dropping TONS of traffic.
The debug was full of these:
ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan248 L2If:GigabitEthernet1/0/17 DI:0xB4, LT:7, Vlan:248 SrcGPN:17, SrcGID:17, ACLLogIdx:0x0, MacDA:001a.a1c4.1cd2, MacSA: 0013.192c.bb80 IP_SA:5.1.1.10
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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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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
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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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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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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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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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Aug 1, 2011
Is possible connect and configuring two cisco wlc in high availability to 3 switches in stack 3750 in difference ports?For example
WLC A (Primary) - SWITCH MASTER
WLC B (Secondary) - SWITCH SLAVE
How can i connect the wlc's in HA to get a redundancy in the stack?
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Jan 22, 2013
We currently have as our stack master a 24 port Non-PoE that we want to replace with a 48 port Non-PoE. The 48 port switch at one time was provisioned as switch 3 in the stack (not the master). Correct me if I am wrong, but theoretically all I should need to do to get this working is to shut off the existing master so it re-elects a master and then provision the 48 port switch as the new switch one and make sure switch 1 has a high priority?
Do I need to write erase the switch that is replacing the current master first?
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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
5555555554444455555555555555588888666669999888885555577777
8888000001111111111222227777755555666662222222229999977777
100
90 ***** ****
80 ***** ********* *****
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Aug 26, 2012
Based on the stace trace, how do I determine what object is being polled??? (what is causing the high cpu for SNMP ENGINE)
From the “show stack 295” output (SNMP ENGINE)
router>show stack 295
Process 295: SNMP ENGINE
Stack segment 0x68226DC0 - 0x68229CA0
FP: 0x68229BD0, RA: 0x62A0D95C
FP: 0x68229BF8, RA: 0x628276A8
FP: 0x68229C68, RA: 0x629FBE08
FP: 0x68229C80, RA: 0x629FBDEC
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Jan 14, 2013
I have a customer with a stack of two switches C2960S-24TS-L that are running 12.2(58)SE2 universal K9, we see that the CPU load increase over time, to 95% and stays there reload solves the problem.the process that akes a lot of CPU is also the SNMP ENGINE, I see that it is running 30 minutes on 95% and then 10 minutes on 35%, this is the only stack were we see this problem. Is there also a SNMP bug in this version ?
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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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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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Apr 16, 2013
We have a current 3-stack 3750 ( 48-P,48-TS & 3750v2-48PS ) running fine. There is a plan to introduce a fourth stack member ( 3750X-48P ) into this stack.as per cisco documentation, it suggests to use 3750X as master for a mixed stack. In this case, we will need to upgrade current other 3 stack switches to a latest version.,Can we do a no-downtime ios upgrade on the existing 3-switch stack?, when this upgrade is done, is there any way to have the new ios pushed down to all three stack members at the same time or do we need to each member upgrade seperately?, for adding the fourth member, is it acceptable if master is ruuning ver eg. 12.2(55) and all rest of the members run ver 12.2(53) ? will this create any issues and will stacking be successful.
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Oct 30, 2012
I have 4 switches of 3750. I need toupgrade all the switches, but I can't to disconnect the stack cable.How I can to upgrade the version without to disconnect the stack cable?
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Oct 4, 2011
I will be installing a new ASA 5510 firewall on our SIP vlan to separate our voice traffic from the rest of the traffic. I'm trying to decide whether or not I should go with an active/active setup or an active/standby. Any insight on the best way to set this up? This install is going in from scratch, and I am going to be connecting to a 3750 switch stack. Should I pair up a link from each switch to each 5510 using etherchannels? Should I use 8.3 or 8.4? Most of the docs I've been able to find say it depends on this, that, or the other.
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Mar 8, 2012
I have 3750 stack with 4 switches.I am trying to make change some port to new VLAN, but switch 2 & 3 new change never works, the ports stick with old VLAN. Other two switches works as I expected on new changed VLAN.Tried to reboot, no progress.
#Show VLAN command confirmed the VLAN changes are made.
#show switch detail
Current
Switch# Role Mac Address Priority State
--------------------------------------------------------
1 Member 0019.e752.xxxx 1 Ready
2 Member 0015.f9bf.xxxx 1 Ready
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Oct 3, 2006
I am building a few 3750 stacks, I want to be able to poll/monitor each individual switch in the stack but as it only has 1 ip associated with the stack how can I do this. I am polling the uplink interfaces but as I only have uplinks on the top and bottom switch I am blind to a switch going down in the middle of the stack.
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Nov 7, 2012
I have 2 3750x switches connected via a pair of stackwise cables, but I keep seeing error messages about the stack&switch ports going up and down,Performance wise, it seems to work, but I'd like to eliminate this message... Sometimes it will go hours without bouncing, sometimes it does it a few times a minute....
*Mar 4 12:56:57.903: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
*Mar 4 13:16:48.070: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
*Mar 4 13:16:49.093: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
*Mar 4 13:38:55.802: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
*Mar 4 13:38:56.809: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
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Jun 10, 2012
I have a switch stack with three WS-C3750X-48 switches running 12.2(55)SE. Recently, stack member 3 went offline for a few minutes, after being online for over a year. A show version on member 3 reports that the system returned to ROM by power-on.
Stack member 3 shares a UPS with a router that did not lose power and all three stack members have stack power with four 350 WATT power supplies between the three of them. There are no crashinfo files on any of the switches, log files show the stack ports on the other switches going offline then switch 3 being removed from the stack.
Surveillance recordings show there was no one near the switch during the time and AAA accounting shows no clues. Is it possible the switch crashed without leaving a trace in the logs, a crashinfo file and report that it returned to ROM by power-on?
I've read before that loose stack cables can cause stack member reboots. Would such an event generate log messages other than the stack ports changing states to down?
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Dec 6, 2011
I have two 3750s stacked and one 3750 standalone all in one data closet. The both have the same versions. I want to combine them to make one stack. How do I force the standalone to be the master? sw 1 priority XX(Higher then the existing stack)? Both the stack and the standalone have management addresses. Would it be ok to delete the stack ip address? That way, the standalone(master's address will be the only management address)?How should I connect the standalone 3750 to the stack? At present, the 3750 stack is connected via a cascade cable going from the stack 1 port of the top switch to the stack 2 port of the bottom switch.
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Jul 4, 2012
I have a 3750 stack of 4 switches that was installed about 2 years ago. Recently I was doing some work on the switch and realized that I am unable to save the config. I amobviously concerned that if the power fails or the switch reboots I will be reconfiguring it and that is not something I am interested in doing!
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May 19, 2013
I have a stack of 4 3750 Switches.
1. WS-C3750G-12S
2. WS-C3750G-12S
3. WS-C3750X-48P
4. WS-C3750X-48P
The stack cable connected to Switch 1 Port 1 and Switch 4 Port 2 will not come back online. The logs show that there was a Stack line change. I have replaced the 1 meter Stack cable from Switch 1 to Switch 4 three times and it still does not come back online. This is the part that is interesting.. I have disconnected Port 1 Switch 4 and connected it to Port 2 Switch 4 and then Switch 4 came back online. This made me think Port 2 on Switch 4 was working correctly. Then I disconnected Port 2 Switch 1 and connected it to Port 1 Switch 1 and then Switch 1 came back online.
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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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Mar 11, 2013
have a cable i think is bad, is it possiable to switch the cable out without causing any downtime to the switch or connected devices?
HQ-1st-Flr-Stack#show switch stack-ports summary
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
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Apr 29, 2012
I just need a little refreshing on upgrading a stack of 3750's. This stack only has 2 switches: [code]
1.) If I remember correctly I simply tftp the IOS to the flash of each switch and then reload the master only?
2.) Can I safely assume these are the 2 flash locations:
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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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Mar 15, 2012
I have been given 2 3750 switches and need to put a config onto it wuld is for 2 3750's in a stack, how should I put this on the 2 switches? Is it bested to install it onto 1 switch first then physically attach the 2nd after?
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Aug 6, 2012
We are trying to configure Etherchannel between four ports of cisco 3750 stack(2ports from one switch of stack and two ports from another switch of same stack). We are facing issues with this setup. The ports in WS-CBS3012 are going to err disable mode.
Is there any limitations associated with such a cross-stack etherchannel configuration. Any particular sequence of configuration involved.
Switch1 in stack
int gi 3/0/3
switchport mo trunk
switchport trunk allowed vlan 10-30
sw tr en dot1q
channel-group 1 mode on
spanning-tree guard root(code )
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Jun 5, 2013
i was just asking if it is possible to create a L3 etherchannel between 2 single 3750 switches that act as our core, (running HSRP for the vlan and with a port-channel between the two) and a new switch stack of 3750s that will be routed to and managed by another party. Only i'd like to have the redundancy of 2 links connecting the new stack.If it is possible are there any best practices or preference in using PAgP or LACP or just going for ON.
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Apr 17, 2012
I am running LMS 4.1 and have an issue with Inventory: I have a stack of four 3750 switches, but only two of them are showing up in CiscoView. If I right-click - Topology - Device Report ; I see all four switches. The switches are standard 3750 switches and should be included in the Device Packages for CiscoView
Also if I go Reports - Detailed Device ; I see the same two devices show up under Module Information. However when I go to Reports - Device Attributes ; I see all four devices correctly displayed.
I have tried and deleted and added the stack in CiscoPrime, but with same result.
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Oct 10, 2012
I'm trying to use LMS to upgrade a stack of switches that have 1 or more 3750x's and other 3750's. In Software Distribution, if I choose Distrube to devices, basic, it finds the x switch, which is the master but says the others are not candidates. I don't see a place where I can tell it it is a mixes stack and choose multiple IOS's.
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Mar 23, 2012
I have a Catalyst 3750 I want to add to an existing stack (same models) through the stackwise port We use some complex QoS and other features on our network, and I'm not sure how much configuration I need to do on the new switch before adding it to the stack. Since this is going into an existing setup?
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