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New Member

5 min. disconnection

my cisco 350 workgroup bridge disconnecting from 350 BRIDGE (working in AP mode) every 5 minute +/- 0-10 sec.

log history from WGB:

1/20 12:06:48 I Connected to parent Cisco-3a5560 <AP-NAME>

1/20 12:06:48 S Lost our association, disassociate with status (7) from parent

1/20 12:01:36 I Connected to parent Cisco-3a5560 <AP-NAME>

1/20 12:01:36 S Lost our association, disassociate with status (7) from parent

1/20 11:56:45 I Connected to parent Cisco-3a5560 <AP-NAME>

1/20 11:56:45 S Lost our association, disassociate with status (7) from parent

1/20 11:51:33 I Connected to parent Cisco-3a5560 <AP-NAME>

1/20 11:51:33 S Lost our association, disassociate with status (7) from parent

1/20 11:46:32 I Connected to parent Cisco-3a5560 <AP-NAME>

1/20 11:46:32 S Lost our association, disassociate with status (7) from parent

1/20 11:41:42 I Connected to parent Cisco-3a5560 <AP-NAME>

1/20 11:41:42 S Lost our association, disassociate with status (7) from parent

and so on ...

log history from BRIDGE (AP mode):

2003/01/20 12:11:50 (Info): Station [WGB_NAME]000a8aa2c06b Reassociated

2003/01/20 12:11:49 (Info): Disassociating [WGB_NAME]000a8aa2c06b, reason "Not Associated"

2003/01/20 12:11:48 (Info): Station [WGB_NAME000a8aa2c06b roamed

2003/01/20 12:06:57 (Info): Station [WGB_NAME]000a8aa2c06b Reassociated

2003/01/20 12:06:57 (Info): Disassociating [WGB_NAME]000a8aa2c06b, reason "Not Associated"

2003/01/20 12:06:46 (Info): Station [WGB_NAME]000a8aa2c06b roamed

2003/01/20 12:01:45 (Info): Station [WGB_NAME]000a8aa2c06b Reassociated

2003/01/20 12:01:45 (Info): Disassociating [WGB_NAME]000a8aa2c06b, reason "Not Associated"

2003/01/20 12:01:45 (Info): Station [Lorien_W]000a8aa2c06b roamed

and so on ...

No timeout settings on my AP and WGB corresponds to 5 minute +/- 2-10 sec.

Why this happens exactly in 5 minute interval ?

20 REPLIES
Bronze

Re: 5 min. disconnection

This could be caused by an older version of firmware running on the two devices. Try upgrading the firmware on the Bridge and the Workgroup Bridge. You can get the latest firmware from here http://www.cisco.com/public/sw-center/sw-wireless.shtml.

New Member

Re: 5 min. disconnection

my bridges running firmware v12.00T and workgroup bridges running firmware v8.80. Problem not solved.

New Member

Re: 5 min. disconnection

You can try new firmare for bridges v12.01T, and problems maybe disapeare.

Cisco Employee

Re: 5 min. disconnection

I have been doing a bit of searching for you and I didnt find an event that happend every 5 mins or a multiple of.

Does it happen if you move the WGB closer to the AP ???

If it still happens when you move the 2 closer together then it really is time to dig out a wireless sniffer and see what is going on.

Your not running EAP/LEAP are you ???

New Member

Re: 5 min. disconnection

no. i am not running EAP/LEAP.

when i move the 2 closer together it still happens.

I have a wireless sniffer. What kind of packets should i monitor and what should i look for ?

Cisco Employee

Re: 5 min. disconnection

Look to see that we are not missing beacons etc Look for disassociate messages basicaly try and find out what is going on around the time that it fails.

On a simpler idea have you tried another SSID and channel The AP seems to think the client is roaming so maybe it is trying to roam

Or do you have multiple AP's close by ?

New Member

Re: 5 min. disconnection

Do you have another workgroup bridge wired one the same lan segment

as you Bridge in AP mode?

Try disconnecting the brdige in AP mode from ethernet and see if you will still

get disconnected

I had a case very simular to this and that solved the issue.

New Member

Re: 5 min. disconnection

yes. This is my scheme:

ROUTER=====AP1---------WGB1=====AP2---------WGB2

=== - ethernet connection

----- - wireless connection

WGB2 disassociating from AP2 in 5 minute interval. But a can't disconnect AP2 from WGB1 because backbone link is going to be down. How can i solve this problem without disconnecting the AP2 from WGB1 ?

Is it a firmware bug ?

Cisco Employee

Re: 5 min. disconnection

I am sorry but that is not really a recommended configuration.

If you want a reliable link for that sort of toplogy you really should use. I assume you do not have a line of sight and this is why you have the above toplogy.

option 1 lower throughput.

AP1--------- AP2 in repeater mode --------- WGB

option 2 If throughput is important then.

BR350 root-------BR350 Non Root=====BR350 Root -----BR350 non root

The work group bridge is only designed to provide network access for a small island of ethernet devices in a wireless environment. Eg to allow a few legacy devices to connect to the network or to allow a few network printers to be connected to a wireless network.

You can try AP2 and WGB2 on a different SSID to the other pair that should help but you really need to look at the network designs above.

New Member

Re: 5 min. disconnection

thanx ... now i have this network design:

BR350 root 1-------BR350 Non Root=====BR350 Root 2-----WGB

Problem is still exists. WGB disconnects in 5 minute interval and reconnects immediately.

SSID & Channels between both wireless links are different.

BR350 root 1 - 6 channel

BR350 root 2 - 11 channel

Firmware on BR v12.01T1, on WGB v8.80

Is this network desing wrong ?

Cisco Employee

Re: 5 min. disconnection

Yes that is a much better setup

If you are still seeing problems with this you most likely have an RF issue you need to fix this. How far is the WGB from the br350 ? The BR350 root2 should be in AP mode NOT bridge root. What do you see has signal strength and quailty what do you see in packet CRC errors etc all the normal thing to troubleshoot the RF link

New Member

Re: 5 min. disconnection

i have 4 wireless links in different zones of my city. All links are designed as shown in previous message. All WGBs it this links are disassociating in 5 minute interval. I have about 10+/-5 bad CRC packets per second, 2 Retries per second and 2 Holdoffs per second on WGBs.

Cisco Employee

Re: 5 min. disconnection

"I have about 10+/-5 bad CRC packets per second, 2 Retries per second and 2 Holdoffs per second on WGBs. "

That sounds like a mix of interference and congestion to me. You need to fix this.

Congestion (holdoffs) can be a symtom of interference so it is hard to say until you fix your packet CRC's

Dont forget that these are layer 2 devices so a broadcast will propogate throughout the network. It is just like building a network with hubs (not switchs).

New Member

Re: 5 min. disconnection

i think this is not the solution. I will try to explain.

I have network infrastructure with this design types:

1) Router ===== Root BR ----- WGB

2) Router ===== Root BR ----- Repiter BR ----- WGB

3) Router ===== Root BR ----- Client BR ===== BR in AP mode ----- WGB

With design #1 & #2 my WGBs do not disconnect from Root Bridge every 5 minute. With design #3 my WGBs disconnect from Bridge in AP mode every 5 minute +/- 2 sec. All Root and AP mode bridges in #3 design are working in a different channels and different SSIDs.

New Member

Re: 5 min. disconnection

Hello brothers.

My problem with 5 minute disconnection still not solved. But ... i understand one thing.

This is not the WGB disconnection. My Cisco Bridges (350 series) in AP mode disconnects all it clients in 5 minute interval. I have about 7 bridges in my network. All of them disconnect there clients in 5 minute interval. Except one. It is connected to catalyst switch. It works fine.

Here is my network sheme:

[ROUTER] == [CATALYST] == [ROOT-BRIDGE1] --------- [BRIDGE_in_client_mode] == [ROOT-BRIDGE2] --------- (many clients with WGB 350 series)

ROOT_BRIDGE2 disconnetcs it clients in 5 minute interval. All clients who works throught ROOT_BRIDGE1 DO NOT disconnetcs from there parent.

--- - radio link

== - ethernet link

Can anybody help ?

New Member

Re: 5 min. disconnection

Hi!

Try to use longer beacon period in your AP(or bridge in AP mode) .

For example use 1000 instead of the default 100.

It may be help

Szicsu

New Member

Re: 5 min. disconnection

this not helped. Bridge still disconnects it clients.

New Member

Re: 5 min. disconnection

Hello!

In the WGB config Do you set the MAC address of the AP(Bridge) ?

Szicsu

New Member

Re: 5 min. disconnection

I tried to set the MAC address for parent bribge on WGBs. Problem still exists.

Problem is in the BRIDGES ! They are disconnect there clients every 5 minute. I mean that the disconnection is initiated from the bridges, not WGBs.

New Member

Re: 5 min. disconnection

hi again brothers.

i'm still not solved my problem. I tried to listem 802.11b managenet and controll packets with sniffer. Now i know exatly that the initiator of this 5 minute disconnection is BRIDGE ! My sniffer detected that it is BRIDGE's disassotiation packet causes this disconnection.

Here is dump of the alert trace buffer on my bridge for one of it clients:

===Beginning of MY_BSA_BRIDGE Detailed Trace Log===

00:29:22 +1762.038462 Packet Alert: 802.11 Unknown Recv:

00:29:30 + 8.000000 Packet Alert: 802.11 Unknown Recv:

00:29:41 + 10.961538 Packet Alert: 802.11 Unknown Recv:

00:29:52 + 11.019231 Packet Alert: 802.11 Unknown Recv:

00:30:02 + 10.961538 Packet Alert: 802.11 Unknown Recv:

00:30:13 + 11.000000 Packet Alert: 802.11 Unknown Recv:

00:30:24 + 11.000000 Packet Alert: 802.11 Unknown Recv:

00:30:36 + 11.038462 Packet Alert: 802.11 Unknown Recv:

00:30:46 + 10.942308 Packet Alert: 802.11 Unknown Recv:

00:30:49 + 2.365385 Packet Alert: 802.11 Unknown Recv:

00:30:59 + 10.615385 Packet Alert: 802.11 Unknown Recv:

00:31:10 + 11.000000 Packet Alert: 802.11 Mgmt Xmit: 00:07:85:92:bb:9c -> 00:0b:46:92:26:c3 addr3=00:07:85:92:bb:9c

dot1dTpPort: src=0 dest=2 priority=7 vlanID=0

802.11 Xmit: rate=0 (sub)type=Disassociation duration/AID=16518 seqCtrl=0x05e5

contents: 0000: a0 00 86 40 00 0b 46 92 26 c3 00 07 85 92 bb 9c |...@..F.&.......|

00:31:11 + 0.326923 Packet Alert: 802.11 Mgmt Recv: 00:0b:46:92:26:c3 -> 00:07:85:92:bb:9c addr3=00:07:85:92:bb:9c

dot1dTpPort: src=2 dest=0 priority=0 vlanID=0

802.11 Recv: quality=9 strength=76 rate=2 channel=1 preamble=L (sub)type=ReassociateRequest duration/AID=258 seqCtrl=0x04e4

contents: 0000: 20 00 02 01 00 07 85 92 bb 9c 00 0b 46 92 26 c3 | ...........F.&.|

00:31:11 + 0.000000 Packet Alert: 802.11 Mgmt Xmit: 00:07:85:92:bb:9c -> 00:0b:46:92:26:c3 addr3=00:07:85:92:bb:9c

dot1dTpPort: src=0 dest=2 priority=7 vlanID=0

802.11 Xmit: rate=0 (sub)type=ReassociateResponse duration/AID=1792 seqCtrl=0x0390

contents: 0000: 30 00 00 07 00 0b 46 92 26 c3 00 07 85 92 bb 9c |0.....F.&.......|

00:31:11 + 0.000000 Packet Alert: 802.3 Xmit: len 42 00:0b:46:92:26:c3 -> [DDP Mcast]01:40:96:ff:ff:00

dot1dTpPort: src=2 dest=1 priority=7 vlanID=0

SNAP: org 004096 type 0x0000

Aironet DDP: length=34 protocolType=InterAP_Registration function=DeregNotice ultimate: 00:0b:46:92:26:c3 -> [DDP Mcast]01:40:96:ff:ff:00

contents: 0000: 01 40 96 ff ff 00 00 0b 46 92 26 c3 00 2a aa aa |.@......F.&..*..|

00:31:11 + 0.000000 Packet Alert: 802.11/802.2 Xmit: len 58 00:07:85:92:bb:9c -> 00:0b:46:92:26:c3 addr3=00:07:85:92:bb:9c

dot1dTpPort: src=0 dest=2 priority=7 vlanID=0

802.11 Xmit: rate=0

SNAP: org 004096 type 0x0000

Aironet DDP: length=50 protocolType=GetInfo function=GenInfoReq ultimate: 00:07:85:92:bb:9c -> 00:0b:46:92:26:c3

contents: 0000: 08 02 18 99 00 0b 46 92 26 c3 00 07 85 92 bb 9c |......F.&.......|

===End of R01Off_BSA_B Detailed Trace Log===

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