Wireless failing everyday

Unanswered Question
Jan 15th, 2009

Every day at least once and sometimes twice, I have several access points that reboot. They all do it at precisely the same time and it is usually the same AP's - about 8 of them.

I have other access points that do not go down.

Any ideas? Could this be a firmware issue?

I have this problem too.
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messaggerielibri Thu, 01/15/2009 - 07:53

Are those APs connected to WLC or standalone?

Are all of them plugged into the same network branch?

king06aaa Thu, 01/15/2009 - 07:55

The AP's are all on the same subnet but they are standalone. They are plugged into different switches

messaggerielibri Thu, 01/15/2009 - 08:12

Have you tried to syslog a couple of them to a log server to get a clue?

Are they perfectly working right before rebooting?

king06aaa Thu, 01/15/2009 - 08:35

I have them logging to syslog and there are NO error messages.

And they are working perfectly before they reboot

ericgarnel Thu, 01/15/2009 - 08:21

This sounds more like a routing or spanning-tree issue. What do the switch and/or router logs say?

It could also be caused by network congestion that is affecting routing or spanning-tree. Are you running any backups over the network or other bandwidth intensive jobs at that time?

king06aaa Thu, 01/15/2009 - 08:37

There are no errors on any of the switches.

I thinking that it could be congestion, but the access points are spread all over the network. Different buildings, different switches, etc.

ericgarnel Thu, 01/15/2009 - 09:20

If you are not seeing any errors, what are the interface counters indicating?

Also, are you using dynamic routing? what do the route tables look like?

king06aaa Thu, 01/15/2009 - 10:40

I hate to sound ignorant, but how do I do what you are asking? Like the interface counters and the routing questions?

ericgarnel Thu, 01/15/2009 - 12:53

on the switches & routers:

Without knowing how your network is built, I can only speculate at this point

The interface counters:

show interface <>


show6506A>sh int gigabitEthernet 2/1

GigabitEthernet2/1 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0013.c40f.0770 (bia 0013.c40f.0770)

Description: Hall2_2 AP

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

show ip route

nat1>sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is to network

C is directly connected, GigabitEthernet0/1.46

C is directly connected, GigabitEthernet0/1.47

C is directly connected, GigabitEthernet0/1.44

Leo Laohoo Thu, 01/15/2009 - 12:59

Do you have a time of when all of the eight AP would reboot? Are the time consistent?

king06aaa Thu, 01/15/2009 - 13:10

For example, they all rebooted at 3:51 today. The time isn't consistent on a day to day basis. It happens at different times during the day.

ericgarnel Fri, 01/16/2009 - 07:05

Sorry, I did not put two & two together earlier.

They are autonomous and they reboot?

I do not think that network congestion or spanning-tree issues would cause them to reboot.

It sounds like you have may power issues.

Leo Laohoo Sun, 01/18/2009 - 21:04

I'll agree with you on this one. All AP's are all on the same location/subnet and failing simultaneously could mean that there may be a power issue or some sort.

wesleyterry Sun, 01/18/2009 - 21:20

Except that the user mentioned these are in different buildings in a previous reply. I'd like to think that if multiple APs are rebooting due to power in different buildings, there would be other network equipment that was noticeably down...

king06aaa Tue, 01/20/2009 - 08:31

The jury is still out, but it seems that we may have figured it out. The AP's that rebooted were at 12.3(2)JA of IOS where the ones that didn't reboot are at 12.3(8)JA2.

We have upgraded the IOS on some of the ones that were rebooting and they seem to be fixed.

I'm not totally sure if that is the solution, but at this point it seems to be.

wesleyterry Sun, 01/18/2009 - 17:40

Can you provide any more details?

For example, are all of these access points the same model? Do you have other models in your network?

Are all 80 access points on the exact same IOS? If not, are all of the APs that reboot on the exact same IOS?


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