420 AP Problem

[Simon Batts]

We are having problems whereby the Wired ethernet port constantly stops responding (Cannot ping etc).

The AP's are patched up to date and have the broadcast/multicast limits enabled.

Any ideas?

Thanks

[Mohieddin Kharnoub]

Hi

Can you explain more about your network topology.

Good Luck !!!

[Simon Batts]

Hi

2 x 9308 Core Switchs with approx 70 26XX & 28xx Series edge switchs.

Muliple class C ip subnets but only one Vlan at present.

[Mohieddin Kharnoub]

Hi

Do you have any network management system controls your network, if you do, try to check its logs.

Usually when broadcast/multicast filtering is enabled for the ethernet the data thoughput of the access point is reduced by 30-40% due to the filtering being performed by software.
Why don't you try to disable this and monitor the AP behavior.

Good Luck !!!

[Simon Batts]

Disabling the Filters makes no difference I'm afraid. The Ethernet point on various 420's still stop responding for several minutes at a time.

A Netgear Wireless AP on the Network will work fine.

[Mohieddin Kharnoub]

Hi

More info about your setup will help us narrow the issue with you.

You may have some firewall installed or a security configuration on your switch or this kind of things.

Try to explain more, like where the APs connected ? do you have any security box ?
Attach a configuration file for the switch you connect to AP to.

Good Luck !!!

[Simon Batts]

Hi

The config for one of the switchs is attached.

There is no security box other than the redundant firewalls.

AP's are located in various points around the Hospital site.

[Matt Hobbs]

Due to the size of your VLAN it's likely that there are times of exessive broadcast/multicasts that may be causing this problem. It seems that enabling the filtering feature on the 420 has not helped so I would strongly recommend you configure a new VLAN for wireless devices only.

[Mohieddin Kharnoub]

Hi

A new Vlan is a good suggestion, at least you will keep the wireless traffic in one group.

You have enabled the fault-finder for the switch and kept the broadcast-storm on a high sensitivity.

You can give it a try to make the Fault-Finder sensitivity on Medium for a testing while, and keep an eye on the Ethernet port of your AP.

If you want to debug this issue, run Ethereal on your computer, make your ehternet port a monitoring port, then select one of the ports for the AP as a monitored port,
run the Ethereal based on a filter of broadcast (and multicast if you want), keep it running, and i'm sure you will be having a good time there :)

Good Luck !!!