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New Member

MAC flapping on WLC ports

Hi all,

I've been getting "%MAC_MOVE-SP-4-NOTIF: Host xx.xx.xx.xx.xx in vlan 123 is flapping between port Gi1/18 and port Po1" entries on my core switches.

The topology looks like this:

Interface Po1 connects my two 6500 core switches, we have HSRP running for each vlan on the the wireless network.

Core 1 has WLC-1 connected to G1/18

Core 2 has WLC-2 connected to G1/16

The problem I think is that as a wireless client roams from AP to AP, those radios may be on different controllers and the path to the HSRP primary interface from the two controllers is via different paths.  We don't have enough capacity on our controllers for one controller to handle all radios, so we can't associate them all to a single controller.

What are our options?  Would connecting both WLC's to each core help?  If so, what would need to be done on the controllers to make this work, if anything?

Thanks!

Everyone's tags (3)
9 REPLIES
Hall of Fame Super Silver

Re: MAC flapping on WLC ports

Do you have mobility up on both WLC's. You shouldn't see that if the WLC's are creating an anchor for the mobility.

Thanks,

Scott Fella

Sent from my iPhone

-Scott
*** Please rate helpful posts ***
New Member

Re: MAC flapping on WLC ports

We’re running 6.0 firmware on the 4400 series controllers. Mobility groups are configured but I don’t see anywhere to configure anchors. So anchors associate a client with the same controller no matter which AP their connected to?

Hall of Fame Super Silver

Re: MAC flapping on WLC ports

Well if your mobility shows up/up mobility should function properly. If you do a show mobility status from the wlc CLI what does it show there.

Thanks,

Scott Fella

Sent from my iPhone

-Scott
*** Please rate helpful posts ***
Bronze

MAC flapping on WLC ports

Hi

I do not think you should point the two ports (Gi1/18 and Gi1/16)  on different switches to the same etherchannel irrespective of whether you are running HSRP or not. Could you remove etherchannel and see if the flapping stops.

New Member

Re: MAC flapping on WLC ports

There is no etherchannel between the controllers and the core, only core to core.

New Member

Re: MAC flapping on WLC ports

There are some different bugs in 7.0 in relation to Mac moving and arp responses. Take a look at the bug toolkit. 7.0.230 fixes many of them I believe.

Sent from Cisco Technical Support iPhone App

New Member

Re: MAC flapping on WLC ports

I’ll check the cli status and get back to you. Thanks.

New Member

Re: MAC flapping on WLC ports

Here’s what I have:

(Cisco Controller) >show mobility ?

summary Displays a summary of the Mobility manager.

anchor Displays the Mobility WLAN anchor list.

statistics Displays statistics for the Mobility manager.

(Cisco Controller) >show mobility summary

Symmetric Mobility Tunneling (current) .......... Enabled

Symmetric Mobility Tunneling (after reboot) ..... Enabled

Mobility Protocol Port........................... 16666

Default Mobility Domain.......................... XYZ

Multicast Mode .................................. Disabled

Mobility Domain ID for 802.11r................... 0x69ed

Mobility Keepalive Interval...................... 10

Mobility Keepalive Count......................... 3

Mobility Group Members Configured................ 2

Mobility Control Message DSCP Value.............. 0

Controllers configured in the Mobility Group

MAC Address IP Address Group Name Multicast IP Status

00:0b:85:46:ff:60 10.23.60.250 PnP 0.0.0.0 Up

00:21:a0:38:49:c0 10.23.60.253 PnP 0.0.0.0 Up

(Cisco Controller) >?

clear Clear selected configuration elements.

config Configure switch options and settings.

debug Manages system debug options.

help Help

linktest Perform a link test to a specified MAC address.

logout Exit this session. Any unsaved changes are lost.

ping Send ICMP echo packets to a specified IP address.

mping Send Mobility echo packets to a specified mobility peer IP address.

eping Send Ethernet-over-IP echo packets to a specified mobility peer IP address.

reset Reset options.

save Save switch configurations.

show Display switch options and settings.

test Test trigger commands

transfer Transfer a file to or from the switch.

(Cisco Controller) >show mobility anchor

Mobility Anchor Export List

WLAN ID IP Address Status

New Member

hey guys, apparently I got

hey guys, apparently I got the same issue in my WLC5500/NEXUS5500

2014 Nov 18 18:57:14 nx-sw02 %FWM-6-MAC_MOVE_NOTIFICATION: Host 645a.045a.7981 in vlan 66 is flapping between port Po1 and port Po2 

the Po1 is connected the wlc1 to nx-sw01 and nx-sw02 

the Po2 is connected the wlc2 to nx-sw01 and nx-sw02

wlc1 got the 7.6.130.0 and the wlc2 have the 7.0.250.0 (last version to support my legacy devices)


 

(wlc-1) >show mobility summary 

Mobility Protocol Port........................... 16666
Default Mobility Domain.......................... MG-UU
Multicast Mode .................................. Disabled
Mobility Domain ID for 802.11r................... 0x9fe9
Mobility Keepalive Interval...................... 10
Mobility Keepalive Count......................... 3
Mobility Group Members Configured................ 2
Mobility Control Message DSCP Value.............. 0

 

(wlc-2) >show mobility summary 

Symmetric Mobility Tunneling (current) .......... Enabled
Symmetric Mobility Tunneling (after reboot) ..... Enabled
Mobility Protocol Port........................... 16666
Default Mobility Domain.......................... MG-UU
Multicast Mode .................................. Disabled
Mobility Domain ID for 802.11r................... 0x9fe9
Mobility Keepalive Interval...................... 10
Mobility Keepalive Count......................... 3
Mobility Group Members Configured................ 2
Mobility Control Message DSCP Value.............. 0

 

 

from the NX I've got the following interface configs

nx-sw02# show running-config int po1

!Command: show running-config interface port-channel1
!Time: Wed Nov 19 11:52:05 2014

version 6.0(2)N1(2a)

interface port-channel1
  description vPC-WLC-1
  switchport mode trunk
  switchport trunk allowed vlan 5,59,60
  speed 1000
  vpc 1

nx-sw02# show running-config int po2

!Command: show running-config interface port-channel2
!Time: Wed Nov 19 11:52:21 2014

version 6.0(2)N1(2a)

interface port-channel2
  description vPC-WLC-2
  switchport mode trunk
  switchport trunk allowed vlan 5,59,60
  speed 1000
  vpc 2

Any thoughts in why some MAC's are flaping between the portchannels?

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