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WLC 2504 fails to find router suddenly

We are using Cisco WLC 2500(model 2504) with 2 Access Points AIR-CAP2702I-D-K9. All are inter connected via a Cisco switch. Everyday I run a basic continuous ping test to all the network devices. One day, WLC could not find/reach the Router all at sudden and everyone got disconnected from internet and I concluded the issue with WLC as I could see Request timed out only to the Router from my machine(wireless) from the daily continuous ping test(the ping was successful to wlc & switch from my machine). Immediately, I powered Off and On all the devices and it starting working normally. As an action to this issue, having discussed in forums, I upgraded the WLC firmware from 8.0.115.0 to 8.1.131.0 and the issue was assumed to be fixed by an upgrade.

After a long time, today we faced the same issue and everyone got disconnected similarly and it's the same router ping test failed. I'm sure it's the problem with WLC and not router because, I tested restarting just the router and it didn't work(couldn't access the router & internet) and after restarting the WLC, everything was working normal.

This happened thrice, and I have no clue of fixing it, i'm afraid it happens again and again. Please anybody help me in fixing this issue!!!

John

I looked at the box. When something like this fails at our clients and hard reset / firmware does not fix it, we replace it.

Craig Beck

It's a far cry to think the issue is firmware or a box failure.

Can you tell us how the WLC is connected to your network? Do you use LAG? Have you configured an Etherchannel at your switch? Do you use STP at the switch? Have you configured 802.1Q trunks?

Admin Senior

ASKER

Can you tell us how the WLC is connected to your network?

The WLC, Access Points(x2) and Router are connected through a Cisco sg300-28p pop switch. The clients are all wireless(Mac laptop)

Do you use LAG?

No.

Have you configured an Etherchannel at your switch?

I have no idea of what Etherchannel is?

Do you use STP at the switch?

No.

Have you configured 802.1Q trunks?

No.

Craig Beck

When it happens again can you upload the logs from the WLC BEFORE you reload it, please?

Admin Senior

ASKER

@Craig: But I noted the logs after the WLC reboot,

*emWeb: Jul 06 13:21:27.477: %AAA-3-ACCTREQ_SEND_FAILED: aaa.c:3718 Unable to send Accounting Request for User cisco. No accounting server is configured.
*nim_t: Jul 06 13:04:47.177: %SIM-3-PORT_UP: sim.c:14022 Physical port 1 is up!.
*bcastDataTask: Jul 06 13:04:38.030: %APF-3-INVALID_MCAST_MODE_ADDR: apf_net.c:4103 Received ipv6 capwap multicast packet source: (fe80::ca10:84ff:fe50:97xx) destination: (::) whencapwap multicast mode is multicast with unconfigured ipv6 address.
*fp_main_task: Jul 06 13:04:22.758: %LOG-3-Q_IND: radius_utils.c:186 Could not construct UDP RCV socket. Setting Enabling DualStack option failed.(Error Num 99:Protocol not available) [...It occurred 10 times.!]
*radiusTransportThread: Jul 06 13:04:22.536: %AAA-3-CONSTRUCT_UDP_RCV_SOCKET_FAILED: radius_utils.c:186 Could not construct UDP RCV socket. Setting Enabling DualStack option failed.(Error Num 99:Protocol not available) 
*capwapHATask: Jul 06 13:04:22.509: %CHKPT-3-CHKPT_GENSYNC_REG_ERR: chkpt_wrapper_db.c:754 Unable to register the client(invalidmode:CHKPT_HA_STANDBY_T) with Gen sync checkpoint service

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Yes, next time when it happens I will try to take logs before I reboot and post it here...

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