Cisco Wireless :: 3560X / Duplicate MAC Entries Causing Port Flapping?
May 8, 2012
I have multiple wireless access points plugged into a 3560X. When the wireless clients begin roaming they cause duplicate MAC enteries to be created and this causes the switch ports to flap. Is there a way to configure the switch to either ignore the duplicate MAC enteries on the switchports that have been connected to the APs or is there a way to have the ARP tables update and resolve the conflicting MAC enteries with out causing the switchport to flap?
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Apr 10, 2012
Any info regarding the number of MAC Entries of Catalyst 3560X/3750X Platform? I can find that number in 3560, 3750 ds but not in 3560x ds.
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Oct 9, 2011
I have setup LAG for one of our 5508 controllers and have connected 4 of the 8 ethernet ports to a 4507 switch. After configuring 2 port channels on the switch we are receiving a host flapping error between the port channels and it seems to be causing a serious slowdown on the switch. When I shutdown one of the port channels the error goes away and traffic returns to normal. I have the same configuration at other locations with the only difference being the switches used are 3750G-12S and I do not see the host flapping error. It appears to only be a problem with modular switches.
One other thing of note: I read a Cisco white paper on LAG and it suggested creating the port channels over 2 different modules. For example, put ports G4/24 and G5/24 in port channel 1 and G4/25 and G5/25 in port channel 2. I tried this but I still got the host flapping error.
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Dec 13, 2011
I want to upgrade my router but I need a router that supports more port forwarding entries for my applications. I have my eye on the WRT310N router but I need to know how big its port forwarding table is.
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Jun 4, 2012
We have some legacy Cisco 6513 switches with the backbone (16-port GBIC blade) MTU set to 1500. It has a WS-X6148A-GE-TX blade as well, MTU set to 9K.
Now we have a customer sending MTU of 1546, their copper interface terminating on WS-6148A keeps flapping. Does the flapping have something to do with the backbone set to 1500? We cant set the backbone to 9K at this moment since it may be intrusive (reuire a reboot).
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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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Oct 2, 2012
I have Cisco 1811 and Cisco 2960 interconnect with each other by TRUNK link. As time pass i recieving below log on cisco 1811 router.
DTP-5-NONTRUNKPORTON: Port Fa8 has become non-trunk
LINEPROTO-5-UPDOWN: Line protocol on Interface FastEtherne t8, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan200, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan300, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan400, changed state to down
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Nov 15, 2012
we use RV082 as main gateway and need to open/forward around 50 ports to inside. But during setting of the rules I got an error message "The max of Port Range Forwarding is 30 entries. You can't add any more.".
In the online help is explicitely said "4. Click the Add to List button, and configure as many entries as you would like."
How can we setup more than 30 port forwarding rules ?
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Sep 11, 2012
I have two Core 6509E SUP2T configued as VSS and has two 48 ports fiber blades. I have two 3750s, I have two gig on each 3750 port-channle to po1 and connected to both the core, one link to each core.Now, I was asked ot add two more links on each 3750 switch to make it a total of 4 gigs on each 3750s (all 4 gig ports/uplinks will be in used an dtwo links to core one an dtwo links to core 2).when i added two additional links on 3750s and bundled them to po1, I created another port channel on core and bundeled the additional two gigs on each core to accomodate for the two additional links (ports on core switches are not consequtives).
adding these two additional ports makes the 3750 switches flap between managemnet vlan and po1.now, i am not sure if I must have added the two additional links on the core to teh current port-channel or core!? I have created another port-channel on core to accomodate for this currently!?
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Nov 12, 2012
I have created 5 new 2 Gig port channels on a 6513 WS-X6516A-GBIC blade connecting to 5 4510R+E switches. 3 of the 5 Port-channels show up/up. 2 show down/down. However, for the 2 showing down, a duplicate Po interface was created with an "A" appended to the name that shows up/up. E.g:
Port-channel26 unassigned YES unset down down
Port-channel26A unassigned YES unset up up
Each of the 4510s has a second 2Gig PO to another 6513 with an identical config and all of those come up fine.
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May 11, 2010
I've run in to this on 3750G's in a various sized stacks. We apply port security for a mac address on a single port (not existing on more than one port - that's a different issue that appears in multiple posts already).In this case:
1) We do a 'sho mac address-table and see that the device with the mac address in question lives on one port, port 1/0/x.
2) We apply mac port security for this exact same mac address to the same port it is already attached to. switch(config)#int g2/0/2 switch(config-if)#switchport port-security mac-address 001a.1ec8.abcd
3) Get this error: 'Found duplicate mac-address 001a.1ec8.abcd'.We again confirm that that is the only port on the entire switch that has this mac-address.Try the command again, same error.
4) We do a bunch of show commands, get in and out of the switch, go back and then try it again, and now it works, same command, same port and same mac address.
-Aging is default 300
-These are Cisco wireless AP's attached to the switch
-This occurs on different switches with different ports using different mac addresses, always same symptoms.
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Apr 17, 2013
If I monitor a trunkport on the rootbridge in both directions I get Duplicate Multicast Packets on the perticular VLAN. The first guess is, that this is worked as designed and not a IOS Bug (Platform CAT6500 SUP720 IOS 12.2(33)SXI9 ) Until know I only found an old Cisco press link from 2002 with this subject.
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Apr 30, 2012
show logging
May 1 16:00:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to down
May 1 16:00:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to up
May 1 16:17:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to down
May 1 16:17:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to up
May 1 16:25:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to down
May 1 16:25:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to up
May 1 17:19:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to down
Configuration as below:
macro name vmware
switchport trunk encapsulation dot1q
switchport mode trunk
no switchport access vlan
[code].....
Note:Both active blade switch and standby one are connecting to same aggregate switch 3750. Yet the active one, with same config as standby one, has not occurred this issue.
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May 22, 2012
We have two catalyst 3560X 24T-S switches connected on two separate LANs (both the networks are redundant to each other). The last port of the switches are connected together?
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Aug 15, 2012
I need to find out what is killing my Ethernet wan circuit urgently, It is a Ethernet trunk port with v lans tagged across it.
its a 3560x switch.
I configured span with the replicate keyword, but I'm not seeing all the traffic I'm sure.
I'm using wire shark.
Is there anything I can do to find what is causing this?
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Sep 24, 2012
We recently upgraded the switch to which an old security device was connected. It worked fine on the old switch's FastEthernet port, which was configured for speed 10 and duplex half, as that is what the device required. The new switch is a 3560X with all Gigabit ports, but the security device's port, also configured with speed 10 and duplex half, does not connect properly.As a temporary test, we daisychained another switch that has FastEthernet ports, and the security device works again.Is there anything else that needs to be added to the configuration, when using Gigabit ports at 10/half?
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May 26, 2013
My customer is seeing these Errors coming up on one of his 2504 WLC's (ver7.3) The MAC's and IP addresses Mentioned seem to be completely fictitious as the customers IP plan is way off these subnets and the vendor lookup tool cant resolve the MAC addresses.I can confirm that there is no conflict.I've seen them appear on other 2504's across his network on seperate occasions.
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Jun 23, 2011
we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. [code] two ports are trunking and one port is for management purposes and the other port is for the all other vlans. But it shows that it flaps always. And i think WLC uses one mac address for all device and not for port specific and that causes problem.
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Dec 1, 2012
I am using 2 anchor controllers 5508 as DHCP server. Anchor controller A is primary and anchor controller B is secondary. From time to time, client will complain "duplicate IP address error" when they try to connect guest wireless.First question: both anchor controller should have a recorder of IP address which is assigned to each PC, right?Second question: is there any way this type of issue can be avoided?
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Feb 18, 2009
I am getting the following error messge on Cat4500:
Feb 18 23:37:53.098: %IP-4-DUPADDR: Duplicate address 10.237.66.3 on Vlan601, sourced by 001d.096b.4858
Feb 18 23:38:58.092: %IP-4-DUPADDR: Duplicate address 10.237.66.3 on Vlan601, sourced by 001d.096b.47ed
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Mar 17, 2010
First here is our network breakdown
8 Windows 2008 Servers - UN effected
5 Windows 2003 Servers - effected with dupe IP's
We have AP - A, B and C all configured static and outside of our DHCP scope
A - 104.240
B - 104.241
C - 104.242
WAP A is setup to allow the Mac's of A and B to repeat its signal. The issue starts about 1-2 minutes after I set B and C to client/repeater and select A in site survey then save the settings. Obviously its weird that only our 2003 servers are getting this error.
The system detected an address conflict for IP address 192.168.105.201 with the system having network hardware address *MAC ADDRESS OF ROUTER A*. Network operations on this system may be disrupted as a result.
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Feb 10, 2011
Using windows xp. how do i find and delete network name?
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Feb 18, 2013
We're running two 5508 WLCs running 7.0.235.3 pushing out 7 WLANs. They are both live. Each WLC is connected to the same stack of 3750G running 12.2(44)SE6 via Etherchannels.I'm getting tons of MAC flapping errors similar to this:9373213: Feb 19 10:53:54.564 CST: %SW_MATM-4-MACFLAP_NOTIF: Host 843a.4b3c.4cec in vlan 752 is flapping between port Po12 and port Po11Each portchannel consists of ports on each of the two switches in the 3750 stack. Only VLAN 752 shows the flapping activity. LAG is enabled on the each of the WLCs. The portchannel and interface configs are identical, minus the channel-group command of course.Maybe completely unrelated....looking at CDP neighbors from the switch is incorrect:
WLC1 Gig 2/0/44 157 H AIR-CT550 Gig 0/0/1
WLC1 Gig 1/0/21 157 H AIR-CT550 Gig 0/0/2
WLC1 Gig 1/0/20 157 H AIR-CT550 Gig 0/0/3
[code].....
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May 22, 2013
I have a WLC 2504 with 5 AP licenses for which I have installed an adder license via GUI. The installation completed successfully, but I still cannot view the new license. The maximum number of APs is still showing as 5 and in fact I cannot add more that 5 APs. I tried installing the license file again, but now I get a "duplicate" error.
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Dec 1, 2008
Having trouble with resolving DNS entries with their WRT160Nv2? By resolving I mean, every once in a while, it browsers will just hang and say "Looking up..." When using nslookup, it says DNS timeout. DNS request timed out timeout was x seconds. Can't find server name for address xxx.xxx.xxx.xxx: Timed out Default servers are not available Default Server: UnKnown Address: xxx.xxx.xxx.xxx
I have the firmware 2.0.02_11 installed. Hooking directly up to the modem, I can resolve entries consistently. When I plug in the router, it works for a little, but becomes very unstable after some time. I spoke with support about this and they suggested changing the IP of the router, as well as lowering the MTU to 1400. Both did not improve stability.
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Mar 8, 2012
In the process of setting-up a E2500 Linksys router, I set-up my secured network which is working fine but also (I do not know how I did this??) set-up the same named network but it is unsecured. How do I delete this unsecured network.Do I need to set-up the router again?
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Feb 15, 2012
I am using virginmedia superhub which is supposed to give me a max of 30mbps. I use it wireless but am often getting fluctuations in speed - sometimes 500kbps upto 20mbps, nothing consistently close over 20mbps or close to 30mbps. I have bought a powerline kit - "develo olan 200 AV Wireless N" which has improved the speed but I still get fluctuations.
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Jul 25, 2011
Since recently replacing my home router with a Linksys E2500, I have been getting Blue Screen of Death (BSOD) with my Company's VPN (AT&T). It only happens when I am running wireless with my E2500. If I am hooked up to my E2500 through a ethernet cable it doesn't happen. I have updated the BIOS on my Lenovo Thinkpad T410 and ensured all of my drivers are up to date. I am 99.9% sure the problem is caused by my Linksys E2500 because I have used my laptop on other wireless routes at work and school and never get this problem. I am also ensured that my E2500 has the current firmware installed and upgraded my Company's VPN to the most current level to no avail.
I am getting DRIVER_IRQL_NOT_LESS_OR_EQUAL Blue Screen of Death in agnfilt.sys.
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Jun 30, 2011
For some reason, I have been trying to use QOS for several network related jobs (VPN, streaming). It would seem that when QOS is enabled and the appropriate ports are set which a high priority, the speed of my connection drops to a crawl. When I disable QOS, I'm flying again. I have confirmed ports, and protocol types (TCP or UDP) and nothing seems to work.
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Jul 6, 2011
My new HP Touchpad 32 GB is causing my E4200 to reset. I can duplicate the issue by simply access the HP App Catalogue. I upgraded the firmware from 1.01 to 1.03 build 13 and the issue still exists.
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Aug 29, 2011
I'm using .01 firware and I notice that after I reboot the router I get duplicate filenames on the HD attached to it with the video files. What folder or config file can I delete so it will do a clean rescan? please fix the E4200 media server in .02 firmware
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Sep 3, 2011
So I just bought and recieved a new computer with the wireless WMP600N.
I turned the computer on and a had small lags every 5th second or so which, even though they are small, are pretty annoying. I then tried to look for a reason as to why this happens and what i found out was that if a turn off the wireless internet connection the lag spikes stops and if I turn it on they occour.
My computers specs are:
I7 2600k 4x 3,40ghz
Nvidia geforce GTX 570
8 gb 1600mhz RAM
WMP600N wireless-N PCI
Windows 7 64xbit
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Oct 18, 2011
I just bought a Samsung BD-D5300 Blu-ray player that allows a bunch of networking options including wireless and wired. I was using the wired option when I came across some conflicts with my network using a Linksys WRT350N v1. The Samsung conflicted with the Linksys's DHCP server. The blu-ray player turns off automatically when inactive. It was causing conflicts with my iPad 2, MacBook Pro and Motorola Atrix android phone whenever it got assigned an IP address. When I reset the router and my cable modem, it wasn't assigned an address for awhile, which fixed things, but as soon as it got an address again, it was caused conflicts by being seen as a LAN by my router. When it wasn't receiving an address, it got the automatic private IP address of 169.x.x.x. When I removed the connection with my router, the conflicts disappeared and my computers were able to access my wifi again.
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