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09-12-2013 10:02 AM - edited 07-04-2021 12:49 AM
Hello everyone!
I had this topic posted to another support forum but never got a response. So I'm posting it here:
I'm getting MAC flap notifications from 2 switches at our remote office from the same two switches (switch 2 & 6). There are a total of 7 switches (5 on the first floor & 2 on the second floor). Each switch connects to the root bridge with no redundant links. There are 4 access points that are autonomous with two SSIDs; 2 of the APs are connected to switch 2 (1st floor) and the remaining two are connected to switch 6 (second floor). The switchport configuration is as follows which is the same at our main campus:
interface GigabitEthernet1/0/1
description *** WIRELESS ACCESS POINT ***
switchport mode trunk
switchport nonegotiate
speed 100
duplex full
macro description cisco-wireless
spanning-tree bpduguard enable
end
At the main campus we have a 5508 WLC with 85 LAPs and we don't have this issue. My assumption at this point has to do with roaming since our therapists have to move between both floors. What's even strange is that I can't find the mac (0013.0210.5344) of the device causing the flaps when I run the command 'show dot11 assoc' from my APs. All I know based off the MAC is that it's an Intel WNIC. Here is the config of one of the APs at the remote office. How can I get to the bottom of resolving these MAC flapping notifications?
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname pag1ap01
!
!
aaa new-model
!
!
aaa authentication login default local
aaa authorization exec default local
!
aaa session-id common
clock timezone -0500 -5
clock summer-time -0400 recurring
ip domain name <DOMAIN>
ip name-server <DNS IP>
ip name-server <DNS IP>
!
!
dot11 vlan-name default vlan 1
dot11 vlan-name dsl vlan 6
!
dot11 ssid pathwaysaironet
vlan 1
authentication open
!
dot11 ssid patnet
vlan 6
authentication open
guest-mode
!
dot11 network-map
power inline negotiation injector 001a.6c7c.4882
power inline negotiation prestandard source
!
!
!
!
bridge irb
!
!
interface Dot11Radio0
no ip address
no ip route-cache
!
encryption vlan 6 key 1 size 40bit <KEY> transmit-key
encryption vlan 6 mode wep mandatory
!
encryption vlan 1 key 1 size 128bit <KEY> transmit-key
encryption vlan 1 mode wep mandatory
!
ssid pathwaysaironet
!
ssid patnet
!
speed basic-1.0 basic-2.0 basic-5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0
station-role root
!
interface Dot11Radio0.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 block-unknown-source
no bridge-group 1 source-learning
no bridge-group 1 unicast-flooding
bridge-group 1 spanning-disabled
!
interface Dot11Radio0.6
encapsulation dot1Q 6
no ip route-cache
bridge-group 6
bridge-group 6 subscriber-loop-control
bridge-group 6 block-unknown-source
no bridge-group 6 source-learning
no bridge-group 6 unicast-flooding
bridge-group 6 spanning-disabled
!
interface FastEthernet0
no ip address
no ip route-cache
speed 100
full-duplex
!
interface FastEthernet0.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 1
no bridge-group 1 source-learning
bridge-group 1 spanning-disabled
!
interface FastEthernet0.6
encapsulation dot1Q 6
no ip route-cache
bridge-group 6
no bridge-group 6 source-learning
bridge-group 6 spanning-disabled
!
interface BVI1
ip address <IP ADDRESS> <MASK>
no ip route-cache
!
ip default-gateway <GATEWAY IP>
ip http server
ip http authentication aaa
no ip http secure-server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
snmp-server community snmpsux RO
bridge 1 route ip
!
!
!
line con 0
line vty 0 4
!
sntp server <SNTP IP>
sntp broadcast client
end
Yes, we're not using the most secure encryption on the wireless and that'll be changed but I need to resolve the flapping issue first. You're help is greatly appreciated. Thanks!
Regards,
Terence
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09-12-2013 11:11 AM
No wonder why u have issues:-) Try setting this as 1,6,11 and 1 where first channel 1 and last channel 1 AP's are far apart physically.
Hope that helps.
Regards
Najaf
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09-12-2013 10:32 AM
Hi Tereace,
Is this Mac flapping causing any trouble for you?
It is very normal on switch to display this mac flapping message if APs are connected to the switch port. The reason for this is due to the fact that switch learns of a particular clients mac from one particular port to which the AP (assume this is AP01)is connected to. Now when the wireless client roam to other AP( assume AP02 which is connected on a different port of same switch where AP01 is connected) the switch will learn that same MAC address on a different port I.e AP02's port and displays the mac flap message.
If u check show dot11 asso on all AP's I'm sure that u will be able to trace the MAC address which is flapping.
Hope that helps
Regards
Najaf
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09-12-2013 10:36 AM
Najaf,
We have had some complaints about some wireless issues and I'm not sure if this is causing those problems. However, other than that, the only trouble it's causing is syslog messages which isn't a technical or performance issue. I was hoping to find out if I can configure local & client power as well as static channel assignments will fix the problem.
Regards,
Terence
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09-12-2013 10:42 AM
Hi,
As far as I have seen so far this doesn't create any performance issue with wireless. I agree that this will generate syslog message which is not much relevant.
What sort of wireless issue has been reported from the site? Most likely the issues would have been caused by channel inference but it will be difficult to say it for sure unless u perform a site survey.
Regards
Najaf
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09-12-2013 10:45 AM
Today was the first day I was able to get over to this office and perform a quick site survey. From my findings it looks like channel interference may be the cause of complaints about drops, etc. I'm going to set the channel assignments manually and set the AP/Client local power and see if that helps.
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09-12-2013 10:48 AM
Hi,
This are autonomous AP's right? Are they not using manual channel assignment now?.
Regards
Najaf
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09-12-2013 10:51 AM
Based on that running config of one of those autonomous APs I posted they're not manually set.
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09-12-2013 10:56 AM
Running config mostly likely will not show you the channel setting I would assume. You could check what channels AP's are running with show cont dot110 and verify is they are on non overlapping channels.
Regards
Najaf
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09-12-2013 11:04 AM
They are definitely overlapping. They are within the 10-20% overlap range of where they're physically placed and the channels are currently 1, 3, 7, and 9.
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09-12-2013 11:11 AM
No wonder why u have issues:-) Try setting this as 1,6,11 and 1 where first channel 1 and last channel 1 AP's are far apart physically.
Hope that helps.
Regards
Najaf
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09-12-2013 11:13 AM
Actually,
I've just done that before you replied. I'm gonna conduct a quick site survey and see what happens but I think this will resolve most, if not, all the issues. Thanks!
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09-12-2013 11:37 AM
Thanks for using the rating...
Let us hope for the best with your wireless issues :-)
Regards
Najaf
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09-12-2013 11:49 AM
Terence,
To avoid channel interference keep same channel aps atleast 20dBm apart. That means take a laptop with softwear that reads dBm, not bars. Stand next to your AP on channel 1. Say you get a 50 dBm (RSSI). Your next ap you hear in that same channel should be at 70 dBm (RSSI).
Make sense?
__________________________________________________________________________________________
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
__________________________________________________________________________________________
"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."
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