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Determine if Fast Roaming is Working

Hello all,

I'm troubleshooting some poor voice performance on a large network. Looking at some traces taken from my WLC, it looks like clients are going through authentication each time they roam to a new AP. However, I don't have much experiencing parsing these logs so I'm not sure if fast roaming is working or these clients are indeed doing a full re-authentication each time they roam. Hoping someone could look a slice of log and provide guidance. Below is an example of what I think is a client roaming to another AP-- this process repeats across 5 APs in a matter of 5 minutes, so I was thinking if it is in fact a FULL re-auth, that might cause an issue.

10:31:52.929602540 {wncd_x_R0-0}{1}: [client-auth] [20640]: (note): MAC: 0001.3e20.8264 ADD MOBILE sent. Client state flags: 0x76 BSSID: MAC: 28ac.9eb6.5dae capwap IFID: 0x90001c60, Add mobiles sent: 1


10:31:52.929778699 {wncd_x_R0-0}{1}: [client-orch-state] [20640]: (note): MAC: 0001.3e20.8264 Client state transition: S_CO_MOBILITY_DISCOVERY_IN_PROGRESS -> S_CO_DPATH_PLUMB_IN_PROGRESS


10:31:52.930056425 {wncd_x_R0-0}{1}: [client-orch-state] [20640]: (note): MAC: 0001.3e20.8264 Client state transition: S_CO_DPATH_PLUMB_IN_PROGRESS -> S_CO_IP_LEARN_IN_PROGRESS


10:31:52.930436631 {wncd_x_R0-0}{1}: [client-orch-state] [20640]: (note): MAC: 0001.3e20.8264 Client state transition: S_CO_IP_LEARN_IN_PROGRESS -> S_CO_RUN


10:32:29.882734777 {wncd_x_R0-0}{1}: [client-orch-sm] [20640]: (note): MAC: 0001.3e20.8264 Re-Association received. BSSID 70db.9807.9aae, WLAN [redacted], Slot 1 AP 70db.9807.9aa0, mmc-cb-nap16, old BSSID 28ac.9eb6.5dae


10:32:29.883446814 {wncd_x_R0-0}{1}: [dot11] [20640]: (note): MAC: 0001.3e20.8264 Association success. AID 1, Roaming = True, WGB = False, 11r = False, 11w = False Fast roam = False


10:32:29.883868382 {wncd_x_R0-0}{1}: [client-orch-sm] [20640]: (note): MAC: 0001.3e20.8264 Delete mobile payload sent for BSSID: 28ac.9eb6.5dae WTP mac: 28ac.9eb6.5da0 slot id: 1


 10:32:29.884237748 {wncd_x_R0-0}{1}: [client-orch-state] [20640]: (note): MAC: 0001.3e20.8264 Client state transition: S_CO_RUN -> S_CO_L2_AUTH_IN_PROGRESS


10:32:29.885126914 {wncd_x_R0-0}{1}: [client-auth] [20640]: (note): MAC: 0001.3e20.8264 ADD MOBILE sent. Client state flags: 0x71 BSSID: MAC: 70db.9807.9aae capwap IFID: 0x90001ad5, Add mobiles sent: 1


10:32:29.918142424 {wncd_x_R0-0}{1}: [client-keymgmt] [20640]: (note): MAC: 0001.3e20.8264 EAP Key management successful. AKM:PSK Cipher:CCMP WPA Version: WPA2


10:32:29.918291329 {wncd_x_R0-0}{1}: [client-auth] [20640]: (note): MAC: 0001.3e20.8264 L2 PSK Authentication Success. EAP type: NA, Resolved VLAN: 3, Audit Session id: 1FC510AC0019FE98EAB0E16C


10:32:29.918777746 {wncd_x_R0-0}{1}: [client-orch-sm] [20640]: (note): MAC: 0001.3e20.8264 Mobility discovery triggered. Client mode: Local


10:32:29.918783670 {wncd_x_R0-0}{1}: [client-orch-state] [20640]: (note): MAC: 0001.3e20.8264 Client state transition: S_CO_L2_AUTH_IN_PROGRESS -> S_CO_MOBILITY_DISCOVERY_IN_PROGRESS


10:32:29.918968983 {wncd_x_R0-0}{1}: [mm-client] [20640]: (note): MAC: 0001.3e20.8264 Mobility Successful. Roam Type None, Sub Roam Type MM_SUB_ROAM_TYPE_INTRA_INSTANCE, Previous BSSID MAC: 28ac.9eb6.5dae Client IFID: 0xa0000cbc, Client Role: Local PoA: 0x90001ad5 PoP: 0x0

5 Replies 5

The triangle of fast roaming is 

802.11k 802.11r and 802.11v 

One send AP list to client other send info when the client start to roaming and finally r is for authentication' the authc part need FT. 

Read more about the three protocol before applying it into WLAN.

MHM

By looking at below 2 messages you can see it is not doing FT-802.11r

10:32:29.882734777 {wncd_x_R0-0}{1}: [client-orch-sm] [20640]: (note): MAC: 0001.3e20.8264 Re-Association received. BSSID 70db.9807.9aae, WLAN [redacted], Slot 1 AP 70db.9807.9aa0, mmc-cb-nap16, old BSSID 28ac.9eb6.5dae

10:32:29.883446814 {wncd_x_R0-0}{1}: [dot11] [20640]: (note): MAC: 0001.3e20.8264 Association success. AID 1, Roaming = True, WGB = False, 11r = False, 11w = False Fast roam = False

HTH
Rasika
*** Pls rate all useful responses ***

Thank you for confirming. That is what I was thinking as well. Now I'll focus my efforts on determining why fast roaming is not taking place, because it seems to be activated on the WLC.

Start with the most basic question:  What is this wireless client

Not all wireless client can/will support 802.11k, 802.11v &/or 802.11r.  

Haydn Andrews
VIP Alumni
VIP Alumni

Also worth looking at https://cway.cisco.com/wireless-debug-analyzer you can put you client debugs/ RA traces in and it will help convert to plan english

 

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