topic Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices in Wireless

SW_MATM-4-MACFLAP_NOTIF due to wifi devices

BartV1982 — Sun, 04 Jul 2021 01:16:31 GMT

we see sometimes on a 3750switch

SW_MATM-4-MACFLAP_NOTIF: Host 000b.xxxx.xxxx in vlan 5 is

flapping between port Gi2/0/42 and port Po7

looking up the MAC we found wifi devices like a pc and handscanner which move to the building thereby changing from AP

Can it be that roaming is not properly configured as the switch sees the MAC flapping?

This is only with wifi devices, fixed servers or so are not flapping

Please help

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

ericgarnel — Fri, 20 Nov 2009 14:29:41 GMT

I see these on occasion too. In our environment it is difficult to track down the end devices as they are guests and are quite temporary indeed.

My first guess would be just as you suggested, that the devices are roaming between APs that are on different controllers and that the mobilty groups are not properly configured. I will double check my mobility settings to verify.

Although, it misconfiguration were the issue, I would expect to see a lot more of these errors.

My second guess would be stale arp cache entries on the wired side then.....

The syslog entry is from a switch that connects the two 6505-E switches w/ wism blades

3747: Nov 20 02:29:19: %SW_MATM-4-MACFLAP_NOTIF: Host 0024.d26f.bbbb in vlan 18 is flapping between port Te0/1 and port Te0/2

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

ismailsh12 — Sat, 21 Nov 2009 04:24:42 GMT

I see the exact same error message on our Cisco 3750 switch. I enabled LAG

since we have more than 40 AP on our controller. Both the links of the controller are connected to the same switch as per Cisco documentation. Below is the error I see - "Nov 20 10:13:09 EST: %SW_MATM-4-MACFLAP_NOTIF: Host 00xx.xxxx.xxxx in vlan 1 is flapping between port Gi2/0/50 and port Gi2/0/49"

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

BartV1982 — Mon, 23 Nov 2009 05:25:59 GMT

@ismail so enabling LAG didn't solve your problem?

@eric so you suggest to check the roaming and make it to always use the same controller, setup like a primary - backup (wifi is not really my field in cisco :s )

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

ericgarnel — Mon, 23 Nov 2009 14:34:57 GMT

Actually, I meant to make sure that the mobility group settings are correct. There should be no issue of roaming between controllers. I believe he saw the issue on APs that were on the same controller, so inter-controller roaming would not be an issue.

Again, I see this issue very rarely. We will see over 20k wireless users throughout the year and I have seen it @ 5times. However, during one event, I saw the same mac address doing it quite a bit... Until I can dig up more info or duplicate it, I am going to chalk it up to client misconfiguration or cruddy wireless nic.

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

blankenshipgc — Wed, 16 Jun 2010 23:55:53 GMT

These messages can be annoying if you run a wireless network where there is a lot of roaming on a Cisco architecture such as C3750's.

Here is how to ensure the messages get completely ignored if you are tired of seeing them:

logging discriminator nolog msg-body drops flapping
logging buffered discriminator nolog
logging console discriminator nolog
logging monitor discriminator nolog
logging host X.X.X.X discriminator nolog

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

ahmad82pkn — Sat, 04 Sep 2010 17:36:14 GMT

Hey Gari, yu solved my old issue of annoying FAN messages thanx dear.

SW_MATM-4-MACFLAP_NOTIF due to wifi devices

Vinay Sharma — Sun, 25 Sep 2011 18:02:31 GMT

Hello Bart,

Please mark the Question as Answered, if the provided information is correct and it helped. By doing that others can take benefit as well.

Thanks,

Vinay Sharma

Community Manager – Wireless

Re: SW_MATM-4-MACFLAP_NOTIF due to wifi devices

qus83 — Fri, 25 May 2018 07:57:35 GMT

I have question
if we apply the commands that you mentioned
all log messages will disappear or just the messages that related to flap ?
and will we see another message from another problem or not ? if we faced problem and we want to check it from log