2960s Link-Flap issue.

I've recently had a few ports on 48 way 2960s go in to err mode.
Bit of digging and they have been disabled due to link flapping. I disconnected the devices to check cables etc and all checked out. I've since repatched in another stacked 2960s without issue.
The switch with the issue seems to have got progressively worse, what started with a couple of ports now has gone to gi1/0/33-40 are now disabled due to flapping.Even though none of the ports are now in use. I've restarted the switch just in case it was having a special moment but no luck.
show log displays
000062: Dec 17 19:30:19.490: %PM-4-ERR_DISABLE: link-flap error detected on Gi1/0/40, putting Gi1/0/40 in err-disable state
Switch attempts to recover after 300s with no luck. Just to confirm there is nothing patched in to the effected ports.
Any suggestions or is it it RMA time.

Hello Leo Laohoo,
Thank you for the quick reply,
I mentioned earlier in the thread that I've unpatched and tested the cables and have moved the devices in to another switch all working fine. Ports also have recover on too, and still are in error mode.
Below is test result on one port which shows fine.
Interface Speed Local pair Pair length        Remote pair Pair status
Gi1/0/33 auto Pair A     0    +/- 0 meters N/A         Normal
                Pair B     0    +/- 0 meters N/A         Normal
                Pair C     0    +/- 0 meters N/A         Normal
                Pair D     0    +/- 0 meters N/A         Normal
Regards
Rob

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MAC Flapping Issue

Dear Folks,
I am working with a IT organization as network administrator, at client site we are getting the MAC FLAPPING issue since 1 month, due to that some time it completely down my whole network. Scenario is like that, we are using Ruckus AP and Zone director as a WLAN controller which is directly conecteted with our core switch. Rest of indoor AP's are connected with Distribute and access switch. Now since 1 month we are getting in core switch below mention notification -
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Log Buffer (8192 bytes):
889842: Nov 18 13:46:37.182 IST: %SYS-5-CONFIG_I: Configured from console by iympladmin on console
889843: 001585: Nov 18 13:47:09.724 IST: %SW_MATM-4-MACFLAP_NOTIF: Host c4d9.879b.cf99 in vlan 13 is flapping between port Gi1/1/4 and port Gi1/1/3 (nhcin-sjp01-2)
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889845: Nov 18 13:49:19.818 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/37, changed state to up
889846: 001586: Nov 18 14:04:57.394 IST: %SW_MATM-4-MACFLAP_NOTIF: Host c4d9.87aa.d584 in vlan 13 is flapping between port Gi2/0/41 and port Gi2/0/35 (nhcin-sjp01-2)
889847: 001587: Nov 18 14:13:39.784 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 0008.2292.1440 in vlan 12 is flapping between port Gi2/1/2 and port Gi1/1/4 (nhcin-sjp01-2)
889848: 001588: Nov 18 14:15:35.735 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 1c3e.843e.c441 in vlan 13 is flapping between port Gi2/0/41 and port Gi2/0/35 (nhcin-sjp01-2)
889849: Nov 18 14:23:23.346 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 14f6.5afa.ecb9 in vlan 12 is flapping between port Gi2/0/37 and port Gi2/0/35
889850: 001589: Nov 18 14:23:23.415 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 14f6.5afa.ecb9 in vlan 12 is flapping between port Gi2/0/37 and port Gi2/0/35 (nhcin-sjp01-2)
889851: Nov 18 14:32:33.860 IST: %SW_MATM-4-MACFLAP_NOTIF: Host c0cb.3886.30cb in vlan 13 is flapping between port Gi2/0/41 and port Gi2/0/35
889852: 001590: Nov 18 14:32:33.954 IST: %SW_MATM-4-MACFLAP_NOTIF: Host c0cb.3886.30cb in vlan 13 is flapping between port Gi2/0/41 and port Gi2/0/35 (nhcin-sjp01-2)
889853: 001591: Nov 18 14:33:05.755 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 843a.4b15.187a in vlan 12 is flapping between port Gi2/0/41 and port Gi2/0/35 (nhcin-sjp01-2)
889854: 001592: Nov 18 14:33:07.017 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 6c88.14a0.93d8 in vlan 12 is flapping between port Gi2/0/41 and port Gi2/0/35 (nhcin-sjp01-2)
nhcin-sjp01#
As mentioned in msg 12 & 13 VLAN is our WLAN.
After getting this msg automatically all network goes down, I need to shut down the associated port winch is directly or indirectly connected with AP, and after some time it will work properly.
Now I need some mechanism which can be block the duplicate source mac address to preventing from this kind of scenario.
Regards,
Shekhar

Hi Devils,
Answer is in below -
1. Are those MAC addresses actual Wireless Hosts? i.e have you traced them?
= Yes, those are actual wireless MAC add, I have check in zone director controller.
2. Are the SSID's set to tunnel?
=No
3. Do you have one ZoneDirector or two?
=Two, both of them are connected with core switch.
I have been confirmed about that if wireless users are roaming between two AP or more it will appear the same error msg, now what would be the solution. ????
What extly the solution is?>
Where should i implement the solution on switch or zone director?
Please suggest!!!!!

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Hi,there
I have a Catalyst 2950 switch which was connected to a 3620 Cisco router.The router had hw problems and was repaired.After that,I tried to connect the repaired router to the 24th port of the switch,where it was.But the LED was off and I saw the port was in err-disable state because of link-flap.I've connected my router to the 22nd port of the switch and everything was fine.The 22nd and the 24th port have the same configuration now.I've entered the "no shut" command on int 24 but the state remained err-disabled.I've entered the err-disable recovery interval 30 but the output of sh errdisable detect recovery was ErrDisable Reason Timer Status
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I would not think this is an hardware issue. To restore port, you need to do a shut first and then no shut. For automatic recovery, you need to configure "errdisable recovery cause all" or "errdisable recovery cause link-flap".

WLC 5508 reboot cause switch port link flap error disable

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today my customer call me saied after reboot WLC , the switch port was err-disable , the cause is link flap
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Hello Asa,
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Hello everyone,
Quick question about what causes a "link flap failure"
Here is the output
11-07-2005 18:48:38 Local7.Warning 172.16.208.184 1737: *Mar 13 05:47:09.196: %PM-4-ERR_DISABLE: link-flap error detected on Gi0/1, putting Gi0/1 in err-disable state
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Hello there 8)
From the previously mentioned switch:
Gi0/1 TRUNK TO ISF159 connected trunk a-full a-1000 1000BaseLX
CONTRA#sh run | begin Gig
interface GigabitEthernet0/1
description TRUNK TO AS
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Gi0/1 TRUNK TO CONTRACTO connected trunk a-full a-1000 1000BaseLX
AS#sh run | begin Gig
interface GigabitEthernet0/1
description TRUNK TO CONTRACTORS
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
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[RSTP] Modifying Timers to avoid link flap related issues?

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Assume the following scenario;
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Question:
1. Is there a feature that can overcome this problem? E.g. adjust some timer to say 60 seconds, such that the primary link has to be working for 60 seconds before reverting to it.
2. Better still is there a feature that sends 'hello' style packets to check if a link is up for 60 seconds before reverting to the primary link? (like tracking in a 1800 series router )
I really only need to know if such features exist, and if they do, what are they called so I can search for it and read about it.
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Fcip link flapping priodically

We have a 9509 at the HQ site and a 9216 in the DR site connected via a DS3.
There are preiodic times when the fcip link will flap and come back up, sometimes it will continue for minutes and has happened for several hours with this error:
%PORT-5-IF_DOWN_TCP_MAX_RETRANSMIT: %$VSAN 50%$ Interface fcip1 is down(TCP conn. closed - retransmit failure)
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thanks for the reply,
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Mac-flap issue

Hi,
I have 16 switches and 3 servers in my network.In server room,i have one cisco WS-C2960S-48TS-L and one WS-C2960S-24TS-L connected to each other.Two eth ports of each server are being timmed and connected to the 2 switches.Every thing is fine but i am getting mac-flap log in both switches.can anyone tell me how can i stop this?
48TS-L is the root bridge of the network and there is only 1 vlan in the network.all the ports are in same vlan of both switches.
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*Feb 1 08:24:28.382: %SW_MATM-4-MACFLAP_NOTIF: Host 0015.5d07.1903 in vlan 101 is flapping between port Gi1/0/48 and port Gi1/0/3
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*Feb 1 08:25:40.351: %SW_MATM-4-MACFLAP_NOTIF: Host 0015.5d07.1e05 in vlan 101 is flapping between port Gi1/0/24 and port Gi1/0/15
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Hello
It occurs when you have a loop between the switches relating to ports bypassing the stp process and enter forwarding state either due stp being turned off or having portfast enabled.
when you have a server connectiing itself to two switches on portfast enabled ports, this can cause this type of issue you are seeing- Check if this is the case and disable the portfast feature on those ports
For trunk ports or if port aggregation check the link negotiation type (usually LACP for servers) is applied the same on both sides of the etherchannel and teamed server nics
res
Paul
Please don't forget to rate any posts that have been helpful.
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VPC trouble - link flapping between C3750 stack and Nexus 5596

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im_add_ifstackentry: higher_if_index = 5018 lower_if_index = 10902
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The configuration is ok because i have another vPC connected to FEX's and is working fine.
Kind regards,

Hello,
Problem solved after upgrade to the last version of NX OS 6.0.2.N2.3
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Is the network connection to Oracle box stable? Is it inside a firewall?
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DD
there are several threads open on this - all stem from problems with the adapter cable (MB571Z/A)
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http://discussions.apple.com/thread.jspa?messageID=9294777&#9294777
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