Multiple WLC devices, Inter-subnet roaming, and Mobility Groups
We have a scenario in which we have multiple controllers in separate buildings (separate VLANs and two different mobility groups) with 200+ APs spread throughout the enterprise. Because of an old controller DNS entry and OTAP, it is probably safe to assume that every LWAPP AP has built a list that includes every controller in the enterprise -- including controllers in another VLAN.
Here is the problem: Recently, a controller at the primary building crashed and some AP's moved to a controller in the secondary building (different VLAN). When that happened, users began roaming between APs in mobility groups. Because of this, inter-subnet roaming did not occur, client IP addresses changed, and loss of connectivity ensued.
My question: Should we create one large mobility group between the two buildings (multiple VLANs) OR should we reset every AP back to default (to wipe the known controllers list), ensure that AP's in each building only know about controllers in that same building, and keep the two separate mobility groups.
I am seeking advice since having one large mobility group would mean possible tunneling back over our gigabit connection between the primary and secondary buildings.
Re: Multiple WLC devices, Inter-subnet roaming, and Mobility Gro
I will say the best use of wireless network is mobility and if you do not have mobility configured then even if you wipe the known controller lists and one controller goes down still your clients will loose connectivity.
But if you have mobility configured and have a large mobility group configured you can achieve roaming incase any disaster happens and you will retain same ip throughout. I understand that you are concerned with tunneling and mobility exchang emessages but all these exchange over gig link should not have much affect.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
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 ...
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.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...