Large amount of traffic with 152x mesh and mac-flap

[andrew.mcmanus]

We have just had a Mesh designed by an external company, and when we plugged it in we began have large numbers of mac-flap notification and more than 700mb of traffic sent across our data network.

Our setup includes 2 5508 controllers and 9 152x APs

3 APs (RAP) with their 5.8 antennas are within close proximity on a vertical pole pointing to the other 6 about 1000mtrs away in an arc. With their ethernet ports plugged into the same switch (native vlan 111) as WLC1 (which is LAG'd to two ports)

Vlan 111 for management of Mesh

Vlan 201 for WLAN

DHCP scope on DC on Vlan 100 (helper address from router)

Q, will the closeness of the 5.8 antennas cause any problems with mac-flap or is likely to be the controllers with their LAG connections or something totally different?

Thanks for any help

[Stephen Rodriguez]

Andrew,

     the proximity of the antennas shouldn't cause the mac-flap notification, nor should the LAG connection cause this.  That's more and indication that the client is flopping between ports on the switch, which generally happens when you are not configured for LAG on the WLC, nor a port-channel on the switch.

the mac address that is being reported in the mac-flap.  Is it a client or is it the MAPs?

If it's one of hte MAPs, you may want to check the antennas of the RAPs, since the MAPs sholdl stabliaze once AWPP has run and optimized the path to the network.  If they are flapping I would look at possible RF or antenna issues.

HTH,

Steve

----------------------------------------------------------------------------------------------------------

Please remember to rate helpful posts or to mark the question as answered so that it can be found later.

[andrew.mcmanus]

Hi Stephen,

I have setup LAG on both WLC's and the switches they connect to.

The mac addresses that are flapping are not on the VLAN111 or 201 ranges, but rather the VLAN100 range, items like our Netapp filer flapping between port (ap1) and port (ap3) on the switch that is connected to WLC1 and the three APs.

Thanks,

Andrew

[Stephen Rodriguez]

is the filer pechance behind MAP3 or MAP4?  and another silly question, is the Netapp filer on wireless?

[andrew.mcmanus]

Hi Stephen,

No Filer is on wired LAN segment of one of the switches on the left of the diagram.

Andrew

[Stephen Rodriguez]

then that's really odd.  You shouldn't see it mac flap, on the AP ports.  I'd probably talk to the LAN Switching TAC team, and see if they can pinpoint a reason.

HTH,

Steve

----------------------------------------------------------------------------------------------------------

Please remember to rate helpful posts or to mark the question as answered so that it can be found later.

[andrew.mcmanus]

It appears that a failure from our vendor to put the ap's onto vlan 1 had caused the issues.

I reconfigured the controller for vlan1 and haven't had any macflap problems.

Sent from Cisco Technical Support iPhone App