Wirleless vlan MAC flapping creating packet loss on a 3560X switch?
In one of our offices we had an issue with mac flapping that caused extreme packet loss so that service was interrupted for the users for a few minutes. I had a tac engineer check this out with me today and in his analysis he advised that this was happening because the switch keeps the mac address learned for five minutes by default and that when an end user is roaming the mac is being learned by more than one switch which is causing the mac flapping.
We were further advised that if this happens again we should remove one of our AP's because this is likely a side affect of having too many AP's located in close proximity.
Has anyone else here on the forums run into this issue? We have plenty of offices with cisco wireless AP's and we have never had mac flapping that actually created packet loss on the switch? The flapping was occurring between an 1140n AP and a trunk port to another switch. When we checked the other switch we see the same output indicating mac flapping on two of the wireless vlans??
Any suggestions or feedback here on the forum would be a great help because the idea the explanation I got today seemed odd.
We have a WLC that hosts our AP's. I was also advised that the switch, keeps the MAC address learned for 5 minutes by default and I could try shortening that but I still think this doesn't sound right.
Do you have any ideas as to what could be causing the mac flapping?
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...
I have created a Powershell script to automatically add a Wireless Guest
User on Cisco WLCs. (tested on 2500 Series) The script should be
completely self explanatory. Prerequisites: Powershell SNMP Module
(Install-Module -Name SNMP) SNMP Write Access to y...