Cisco Switching/Routing :: 3750 - VLAN Flapping Error Message
Sep 15, 2012
I recently upgraded my network to have two 3750x core, one interface on the Cisco is connecting to a Net gear switch via a fiber converter. I am keep getting the vlan flapping error message in my log as below.
003396: Sep 17 01:46:16.328: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
003397: Sep 17 01:46:19.843: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
003400: Sep 17 01:49:58.769: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/17, changed state to down
[Code] .....
After my research i think this is a looping issue but I'm unsure how to address it.
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Aug 27, 2012
I am receiving the following error message on a Cisco 3750 switch stack. Need troubleshooting this error message.
00:03:13: %SW_MATM-4-MACFLAP_NOTIF: Host 00d0.7400.2730 in vlan 600 is flapping between port Gi2/0/3 and port Gi2/0/2
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Feb 7, 2011
I have cisco switch model WS-C3750G-12S-D. It is in transparent mode. I am getting below error message when tried to create new vlan.
Proposed configuration exceeds the limit of 1005 VLANs that can be supported on this platform. Reduce the number of VLANs proposed to be within this limit.
After deleting few unnecessary vlans, it allowed me to create.
3750#sh vtp statusVTP Version : running VTP1 (VTP2 capable)Configuration Revision : 0Maximum VLANs supported locally : 1005Number of existing VLANs : 959VTP Operating Mode : TransparentVTP Domain Name : VTP Pruning Mode : DisabledVTP V2 Mode : DisabledVTP Traps Generation : DisabledMD5 digest : 0xBC 0xA7 0xEC 0xDE 0x36 0x6C 0x61 0xB4 Configuration last modified by 97.193.17.172 at 0-0-00 00:00:00
I confused with terms 'maximum supported vlans' and 'maximum locally supported vlans'. If switch is supporting vlans 1-4094 means it should also allow to create locally. Otherwise how they will pass through the switch trunks without local creation.
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Jan 6, 2013
Have a small stack of two 3750 routers. Get the following error message every few secounds:
%STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
%STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Now I replaced the stacking cables but no joy. It was ok for an hr or so but then the error messages popped up again. Also random links on this stack back to access layer user switches have been going up and down randomly. So I have decided to take the next step and upgrade the IOS.
Although when I try and copy a new IOS I get the following error:
%Error writing flash:/c3750-ipservicesk9-mz.122-55.SE6.bin (No space left on device)
Seems this image is 130MB while the image that is currently on it is 74MB and free space is 54MB. How do I get the image onto the router? If I delete the current image from flash will that cause the router to stop functioning?
Also I noticed there seems to be more than one flash directory. See below:
copy tftp: ?
flash1: Copy to flash1: file system
flash2: Copy to flash2: file system
flash: Copy to flash: file system
null: Copy to null: file system
nvram: Copy to nvram: file system
running-config Update (merge with) current system configuration
startup-config Copy to startup configuration
system: Copy to system: file system
vb: Copy to vb: file system
The current router image seems to be in flash1 and flash 2 also. Could I delete the image from flash1. Upload it there and then boot the router from flash1?
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Sep 22, 2011
I recently upgraded my network to have two 3750x core, one interface on the cisco is connecting to a Netgear switch via a fiber converter. I am keep getting the vlan flapping error message in my log as below.
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Apr 14, 2013
i have a question, i have in the logging of my switches a mac falpping problem. i have a log notification : Apr 12 19:33:13: %SW_MATM-4-MACFLAP_NOTIF: Host xxxx.f065.520c in vlan 25 is flapping between port Gi0/1 and port Fa0/35. When i look up what is connected to interface FA0/35 it is a accespoint " AIR-AP1242G-A-K9" Cisco IOS Software, C1240 Software (C1240-K9W7-M), Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)
How this is making the mac flapping ?
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Mar 10, 2012
We have a pair Cisco 6509 switch in which 2 * 48 Port 1G line cards and 1 * 16 Port 10G line Card, FWSM and Sup 720 are installed.We have Cisco UCS and HP Blade servers.Cisco UCS servers are connected to Cisco 6509 switch using Fabric Interconnect, and HP Servers are directly connected to core switches.Recently the team made many changes in the network. Upgraded the IOS in Cisco 6509 switch, Configured Port profiling , MAC Pinning , HBA Cards to UCS / Nexus 1000V Infrastructure. After this change they lost the connectivity to UCS and HP Serers. Every tower is checking at their end.
The Network Team has reverted back the core switch with old IOS , but still the problem persisit.I could only see the following error log in the core switch. There are two port-channels one between core 1 and core 2. The other is between core switch and FWSM module. [code]
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Mar 11, 2012
I have an issue with a Cisco 3750 switch stack which is connected to two seperate upstream Cisco 3750's which are administered by an ISP. The ISP is experiencing MAC address flapping from one of my VLAN SVI's i am using to route traffic upstream
[code]...
As you can see I utilise a VLAN SVI to route traffic to the upstream 1.1.1.2 (illustration only) IP. As per the diagram of the topology attached, the ISP is receiving a MAC address flapping error confirming the SVI MAC address from my switch stack is being learnt on the trunk port connecting switch 1 and switch 2, and also the port (Gi1/0/48) directly connected to my switch stack. As these are all Layer 2 links essentially being passed upstream and then connected between the two ISP switches, we have a 3 way triangular loop formed.
If I was to remove the port channel configuration from the two ports associated with the VLAN SVI, am i right in suggesting this would still form a layer 2 loop? The two ports would still be a member of the SVI VLAN, and it is the VLAN MAC address which is being learnt by the two ISP switches on different interfaces.
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Jan 2, 2008
I have this system: IOS (tm) C3750 Software (C3750-I5-M), Version 12.1(19)EA1d, RELEASE SOFTWARE (fc1
An error appear in console (many times in one minute):
Jan 3 16:25:37: %LINK-3-BADMACREG: Interface StackPort1, non-existent MACADDR registry for link 0
-Process= "<interrupt level>", ipl= 4
-Traceback= 20A364 187F04 58D6FC 58B950 2D7CE0 2E00C8 2E2BEC 2E2F24 2B0BF8
What is the problem? What is the solution?
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May 8, 2011
I've taken 2 4507's fresh out of the box running CAT4500E-ENTSERVICESK9-MZ.122-53.SG2.BIN which was upgraded from CAT4500E-IPBASEK9-MZ.122-53.SG2.BIN
I'm getting constant %C4K_S2W-4-WRITECALENDARERR: Calendar write operation Failed errors on the console. I was also getting them on the original IOS version.
Anything I've seen say's to ignore them but their very frequent filling up the logs.
There's very little return on google and no bugs to report on Cisco?
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Aug 28, 2011
I am using 3750 ME switch and we have restarted the switch 7 weeks age and we are getting error message, we are using MPLS / BGP in this switch.
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May 27, 2013
I have in logs following error message:
%DEVICE_TEST-2-PWR_MGMT_BUS_FAIL: Module 1
Has failed test SpineControlBus 20 times on device Power Mgmt Bus on slot 10 due to error Spine control test failed error number 0x00000002.
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Nov 15, 2012
I get a unclear log entry in a VSS system.
Me_Kr #1 ME_KR_ERROR_CNT_LTL_PARITY_ERR_ITRP_0_0[01C8] : INTR= 0001 MASK= 0001
Me_Kr #1 ME_KR_ERROR_CNT_LTL_PARITY_ERR_ITRP_0_0[01C8] : INTR= 0001 MASK= 0001
Me_Kr #1 ME_KR_ERROR_CNT_LTL_PARITY_ERR_ITRP_0_0[01C8] : INTR= 0001 MASK= 0001
Me_Kr #1 ME_KR_ERROR_CNT_LTL_PARITY_ERR_ITRP_0_0[01C8] : INTR= 0001 MASK= 0001
[code]....
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Jan 10, 2013
I have two networks at two sites with a dot1q trunk between the two L3 switches at both sites (no routers involved)
SITE A - Cisco 3750 L3 - VLAN ID 50
10.10.50.0/24
SITE B - Cisco 3750 L3 - VLAN ID 50
10.20.50.0/24
I would like to extend the SITE A VLAN to SITE B so that I can move hosts from SITE A to SITE B without needing to change their IP address but the vlan ID is already in use. Obviously the easy solution is to change the VLAN ID for one or other of the sites but both sites contain hosts that run 24/7. Is there a way to join two VLANs with different IDs together.So for example I create a new VLAN 60 at SITE B and associate it with VLAN 50 at SITE A.
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Nov 20, 2012
We have a low bandwith (15-20 Mbit/s) to the ASA from our Client vlan. If i connect the Client to the same vlan as the ASA is, the bandwith (90 Mbit/s) is good.
Here are the Layer 3 Design:
Client -> vlan 2 - Switch - vlan 7 -> vlan 1 - ASA 5505 -> ISP
The Layer 2 Design:
Client -> Gig2/0/13 - Switch - Gig4/0/43 -> Eth0/1 ASA5505 -> ISP
IP Address:
Client: 172.16.2.10Vlan2: 172.16.2.1Vlan7: 172.16.7.1ASA: 172.16.7.2
I assuming the switch has a problem with routing ?It is a stacked Switch with following members:
switch 1 provision ws-c3750g-12sswitch 2 provision ws-c3750g-24tsswitch 3 provision ws-c3750g-24tsswitch 4 provision ws-c3750x-48
And we have following error message in the log from the switch:
%PLATFORM_UCAST-4-PREFIX:
One or 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 I first get the idea that the switch is overloaded with router traffic. Thats why i assuming i have to check the sdm templates, but i'm not sure if this resolves the issue.
Here are the relevant config:
ASA Interface on the Switch:
interface GigabitEthernet4/0/43description ASA-inside LANswitchport access vlan 7switchport mode accessspanning-tree portfast
Client Interface on the Switch:
interface GigabitEthernet3/0/1switchport access vlan 2switchport mode accessswitchport port-securityswitchport port-security aging time 2switchport port-security violation restrictswitchport port-security aging type inactivitymacro description cisco-desktopspanning-tree portfastspanning-tree bpduguard enable
[code]...
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Jun 5, 2011
my MSFC2 sent this strange log message. %DATACORRUPTION-SP-1-DATAINCONSISTENCY: copy error, The error message decoder tool says: "NOT FOUND". The level is "alert".
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Dec 20, 2010
We are running a small network business and as funs of ciscos we own a some of the 4948s.We are facing an issue with couple of them as we get the below error message
C4K_CHASSIS-3-INSUFFICIENTPOWERSUPPLIESDETECTED:Insufficient power
supplies present for specified configuration
First thought to replace the power supply didn't actually work as we did that with no result.Power consumption is not an issue as well because all other 4948s work fine with 1 power supply (forgot to mention is 1 power supply in all of them).
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Sep 8, 2012
I have a Cisco 2800 series and it doesn't boot, only shows this message in the CLI>
Bad RAM at location 0xA0000304: wrote 0xA0000304, read 0xA0000004
What means this? I have to change the RAM?
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Dec 6, 2012
I am receiving this error after connecting a copper adapter on a GBIC blade in a 6509. Here are the results from the show Interface. I am waiting to confirm the device on the other side settings but as far as I see I get UP and Up for protocol and line respectively.
GigabitEthernet2/11 is up, line protocol is up (connected)
Hardware is C6k 1000Mb 802.3, address is 0009.11e4.f3ce (bia 0009.11e4.f3ce)
Description: RCPBSDEV
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
[code]....
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Dec 10, 2012
I have Nexus 7K installations in 2 locations. Both of them have multiple VDCs. In default VDC there are continous tacacs error message though tacacs is not configured. The requests are from various public IPs where thsi VDC is not exposed to Internet at all. What would be t he cause of it?
%AUTHPRIV-3-SYSTEM_MSG: pam_aaa:Authentication failed for user root from 195.2.219.2
2012 Dec 11 16:25:28 IDC-FBDTB-AMR2-CN7K-01 %AUTHPRIV-3-SYSTEM_MSG: pam_aaa:Authentication failed for user nagios from 67.78.206.226
- sshd[25797]
2012 Dec 11 16:25:34 IDC-FBDTB-AMR2-CN7K-01 %AUTHPRIV-3-SYSTEM_MSG: pam_aaa:Authentication failed for user nagios from 67.78.206.226
- sshd[25799]
[code]....
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Nov 12, 2012
NEXUS 7000 Octopus internal error in device 78 message. I got this on NEXUS 7000 logs:
Nov 12 22:05:14 smale-outside : 2012 Nov 12 21:05:14 BRST: %MODULE-2-MOD_DIAG_FAIL: Module 2 (serial: JAF1548AMKB) reported failure on ports 2/1-2/32 (Ethernet) due to Octopus internal error in device 78 (device error 0xc4e0025b)
Nov 12 22:05:17 smale-outside : 2012 Nov 12 21:05:17 BRST: %MODULE-2-MOD_FAIL: Initialization of module 2 (serial: JAF1548AMKB) failed
Nov 12 22:05:18 smale-outside : 2012 Nov 12 21:05:18 BRST: %MODULE-2-MOD_FAIL: Initialization of module 2 (serial: JAF1548AMKB) failed
[code]....
I only have found:
[URL]
which does not match reality : No one was configuring Vlans.
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Feb 9, 2013
When i connect the Router 2821 through the Consol get error message at regular interval of time %ENVMON-4-FAN_LOW_RPM: Fan 1 service recommended.
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Oct 24, 2012
I have a network with a Catalyst 3750 as the main switch and then some Catalyst 2960 switches that are plugged in to that. I have a server running windows server 2008 with a couple of virtual machines running in Hyper-V. I created 4 VLANS listed below and gave the 3750 the following IP Address.I would like the 3750 to only be configurable from VLAN 40 but currently every VLAN can connect to it, I noticed in the standard web page settings there was a setting for "Management VLAN" but it was set to 1 and would not let me change it, I kinda assumed that was for the management port in the back.-Now the tricky part, I was trying to set up routing between the VLANs and so far I have only been able to get a sort of "all or nothing" routing to work. I can turn IP routing on and add two or more VLANs to the routing and it works fine. But what I was hoping to do is create a couple of "junction vlans" that would only route to one or two other vlans. For instance, I wanted to create a VLAN 100 that routed to VLAN 20 and 30 but nothing else. I also want to route VLAN 1 just to VLAN 30, and so on. I am able to do each one of the cases but only one, it seems like the switch only supports one "routing table" am I missing something or is this just a limitation of the switch?
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Oct 28, 2012
I have a network with several catalyst 2960 switches and one catalyst 3750. I have created two VLAN and set up the proper routing and everything is working fine there. I have a client/server application that used multicast in the initial start up for the client to determine available servers, the issue is one of my clients is on a different VLAN then the server. I am able to route the multicast using MVR as long as both the server and the client are plugged into the 3750 by creating a static route, making the server a source port and the client a receive port. Unfortunately I need the client and the server plugged in to different 2960s. My question is how do I establish multicast routing between the two and perferably do it dynamically (always route multicast traffic from one VLAN to another).
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Dec 17, 2011
I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net.
My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20
I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2)my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to go out to the internet. I think it has to do with the routes. [code]
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Mar 24, 2013
In 3750 switch,I have configured intervlan routing.I have three vlans Vlan 10,vlan 20,Vlan 30 and I have assigned IP address for that Vlan.In vlan 10,I have connected one systen gigabitethernet 0/1 interface.From my system I am able to ping vlan 10 ip address but I can't able to ping other vlan ip address (vlan 20,vlan 30).Is it possible to up the protocol for all that time.
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Jan 1, 2012
I have a Cisco 3750 with private VLANS configured.. VLAN 2 is the "primary", VLAN 3 is "isolated" and VLAN 4 is "community". This is all working correctly, however I now have the need to another VLAN called "production". I need the production VLAN to be able to reach all the private VLAN hosts (community and Isolated), and vice versa
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Dec 8, 2011
I have a quick query which i need ratified before proceeding. I have the following scenario -
Two Cisco 3750v2 switches with stackwiseISP allocated block of /26 (64 addresses)8 customers each with a VLAN and SVIInternet facing VLAN and SVIDefault route to ISP router Lets say the ISP has given me the network range 10.10.10.0/26 (we'll assume this is routable on the internet for the purposes of this example) and a default gateway to the internet of 10.10.10.1 within this range. I have configured a public facing VLAN as follows -
VLAN 300
name PUBLIC
int VLAN 300
IP Address 10.10.10.2 255.255.255.252
I have then created a default route as follows -
ip route 0.0.0.0 0.0.0.0 10.10.10.1
With this configured, the switch can successfully route upstream to the internet with no problems. I have then moved onto the customers and depending on what service they have purchased, I have subnetted the 10.10.10.0/26 range into smaller subnets. See as follows -
Customer A - 10.10.10.4/30
Gateway IP - 10.10.10.5
Useable IPs - 10.10.10.6
Customer B - 10.10.10.8/29
Gateway IP - 10.10.10.9
Useable IPs - 10.10.10.10 - 10.10.10.14
This continues for each customer depending on how many IP's the have purchased. I have then assigned these IP ranges to a customer VLAN and SVI as follows -
Customer A
VLAN 10
name CUST-A-VLAN
int VLAN 10
ip address 10.10.10.5 255.255.255.252
[code].....
It is then up to the customer as to what equipment they use and how they NAT or firewall their internal networks.
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Nov 9, 2011
I'm having some problems when upgrading the IOS of my Catalyst 3750 switch through a tftp server. I've been surfing the net and found that there seems to be a problem when the image file is larger than 16M but this is not my case.I erased the flash to be sure that there was enough memory space to upload the image but didnt work.I also tried with archive download-sw /overwrite command and using a ftp server but the problem is the always the same: [code]To make sure it was not a problem of my computer or tftp server, I tried with a different computer and with a different tftp server but the same happen. I also tried with a 3750V2 and still the same. Even when trying to backup the current IOS to my computer, I got "error writing".
Then, I have tried to do the same with a different model of switch, a WS-C3560-48PS and it works perfect.I still need to try using Xmodem but Xmodem takes ages to finalize the process.
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Oct 10, 2012
Have a quick question regarding inter-vlan routing on a 3750. Overview of network is ISP --> ASA --> 3750 (acting as my core and default gw). I have 5 vlan interfaces on my 3750, all w/ 192.192.x.x subnets, a 6th w/ 192.168.100.x, and a 7th w/ 192.168.200.x. I have enabled "ip routing" on the switch and can successfully ping from subnet A to subnet B as long as both devices are using the correct DG for their vlan, which is the switch. I have a few ports that are trunked as well that go to ESX hosts which break out the vlans according to the subnet the vm should be attached to. The ASA is set to nat internal traffic for all the vlans.
Now my question: short of applying an ACL to each vlan interface to block traffic from other 192.192.x.x subnets is there a better way to accomplish this? I want my 192.168.10.x subnet to be able to reach all the subnets, but don't want 192.192.10.x to be able to talk to 192.192.20.x for example. I was thinking to create an acl like this:
access-list 120 permit ip 192.192.10.0 0.0.0.255 access-list 120 deny ip 192.192.0.0 0.0.255.255 192.192.10.0 0.0.0.255access-list 120 permit ip any 192.168.100.0 0.0.0.255 192.192.10.0 0.0.0.255
and then applying this to the interface for the appropriate vlan.
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Jan 18, 2012
I have one VLAN on a 3750 where I do not see any MAC addresses even though it is in use. This is an unrouted VLAN between a WLC on a port- channel /LAG and an access port to an ASA for guest traffic. When I do a show MAC add I get nothing for VLAN 60 (guest DMZ) but all other VLANs seem to be OK. Spanning tree is not showing TC counters incrementing either.
I also was told when put a port on this VLAN the laptop did not get a DHCP address form the ASA, but the wireless guest clients are working fine. I can see the DHCP leases and ARP entries in the ASA and the ASA ARP in the WLC so some traffic is passing fine. I'm not onsite right now so troubleshooting is all remote which limits some options.
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Jul 1, 2012
I have setup both Vlans on 3com and cisco. but it seems they cant talk to each other.ive setup both on trunking mode?
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Feb 29, 2012
I have a 3750 switch which has the command 'spanning-tree vlan **'. I am struggling to remove this command, as this particular VLAN is one I want to distribute across our network.I have so far, set the switch to VTP Transparent mode and removed the VLAN from the database, this removes the command. If I then put the switch back to VTP client mode (or manually add the VLAN, while in in VTP transparent mode) then the command comes back. Submitting the command 'spanning-tree vlan **' command has no affect.
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