Layer2- Inter Controller Roaming

In this post we will see the roaming between inter controllers.

Inter-controller roaming occurs when a client roams between two APs registered to two different controllers, where each controller has an interface in the client subnet. When a client roams between controllers on the same subnet, the controllers exchange mobility messages, and the client database entry is transferred from the original controller to the new controller. Client traffic then flows through the new controller on to the network just like it did on the original controller.

My Topology

L2Inter1

Basic Workflow of inter controller roaming:

L2 - Inter Controller Roaming

L2Inter2

My client already connected to WLC1: See the output from WLC1

(WLC1) >show client summary
 Number of Clients................................ 1
 MAC Address       AP Name           Status        WLAN           Auth Protocol         Port Wired
 ----------------- ----------------- ------------- -------------- ---- ---------------- ---- -----
 ab:26:96:3e:4b:ee AP001             Associated    8              Yes   802.11a          1    N/A
(WLC1) >show client detail ab:26:96:3e:4b:ee
 Client MAC Address............................... ab:26:96:3e:4b:ee
 Client Username ................................. N/A
 AP MAC Address................................... 00:22:bd:98:3a:30
 AP Name.......................................... AP001
 Client State..................................... Associated
 Client NAC OOB State............................. Access
 Wireless LAN Id.................................. 8
 BSSID............................................ 00:22:bd:98:3a:38
 Connected For ................................... 12 secs
 Channel.......................................... 36
 IP Address....................................... 10.99.81.22
 Association Id................................... 1
 Authentication Algorithm......................... Open System
 Reason Code...................................... 1
 Status Code...................................... 0
 Session Timeout.................................. 0
 Client CCX version............................... No CCX support
 QoS Level........................................ Silver
 802.1P Priority Tag.............................. disabled
 WMM Support...................................... Enabled
 Power Save....................................... OFF
 Supported Rates.................................. 6.0,9.0,12.0,18.0,24.0,36.0,48.0,54.0
 Mobility State................................... Local
 Mobility Move Count.............................. 0
 Security Policy Completed........................ Yes
 Policy Manager State............................. RUN
 Policy Manager Rule Created...................... Yes
 ACL Name......................................... none
 ACL Applied Status............................... Unavailable
 Policy Type...................................... WPA2
 Authentication Key Management.................... PSK
 Encryption Cipher................................ CCMP (AES)
 Management Frame Protection...................... No
 EAP Type......................................... Unknown
 Interface........................................ interwlc
 VLAN............................................. 81
 Quarantine VLAN.................................. 0
 Access VLAN...................................... 81
 Client Capabilities:
 .
 .
 .
 (WLC1) >
  

Now I will reset AP001 to disconnect my client forcefully to check the roaming.

Go to Wireless > All AP and then click on AP001 > Reset AP Now.

L2Inter3

Once AP001 will reset after that our client will roam to another AP(AP002).

See the logs for client which moved to WLC2.

(WLC2) >show client summary
 Number of Clients................................ 1
 MAC Address       AP Name           Status        WLAN           Auth Protocol         Port Wired
 ----------------- ----------------- ------------- -------------- ---- ---------------- ---- -----
 ab:26:96:3e:4b:ee AP002             Associated    8              Yes  802.11g          1    N/A
(99CWLAN2) >show client detail ab:26:96:3e:4b:ee
 Client MAC Address............................... ab:26:96:3e:4b:ee
 Client Username ................................. N/A
 AP MAC Address................................... 00:3a:99:14:13:70
 AP Name.......................................... AP002
 Client State..................................... Associated
 Client NAC OOB State............................. Access
 Wireless LAN Id.................................. 8
 BSSID............................................ 00:3a:99:14:13:77
 Connected For ................................... 21 secs
 Channel.......................................... 1
 IP Address....................................... 10.99.81.22
 Association Id................................... 1
 Authentication Algorithm......................... Open System
 Reason Code...................................... 1
 Status Code...................................... 0
 Session Timeout.................................. 0
 Client CCX version............................... No CCX support
 QoS Level........................................ Silver
 802.1P Priority Tag.............................. disabled
 WMM Support...................................... Enabled
 Power Save....................................... OFF
 Supported Rates.................................. 1.0,2.0,5.5,11.0,6.0,9.0,12.0,18.0,24.0,36.0,48.0,54.0
 Mobility State................................... Local
 Mobility Move Count.............................. 0
 Security Policy Completed........................ Yes
 Policy Manager State............................. RUN
 Policy Manager Rule Created...................... Yes
 ACL Name......................................... none
 ACL Applied Status............................... Unavailable
 Policy Type...................................... WPA2
 Authentication Key Management.................... PSK
 Encryption Cipher................................ CCMP (AES)
 Management Frame Protection...................... No
 EAP Type......................................... Unknown
 Interface........................................ interwlc
 VLAN............................................. 81
 Quarantine VLAN.................................. 0
 Access VLAN...................................... 81
 Client Capabilities:
 .
 .
 (WLC2) >

 

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