Unreachable device behind a workgroup bridge

Unanswered Question
Jun 23rd, 2008
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we have a problem, that already occured at two locations:

We installed workgroup bridges (at one location a AP-1242AG connecting to an IOS-AP, at the other location a AP-1131AG connecting to a controller-based WLAN). Behind these workgroup bridges there are devices that talk very little by themselves (about one packet per hour).

So in the IOS-WLAN they are reachable only after pinging the device from the AP to which the WGB is connected. In the controller-based WLAN they are only reachable from the WGB itself, not from the rest of the LAN.

My suspicion is, that these devices disappear from the ARP-/Mac-Address-tables because of the little traffic they send. How can we work around this problem? Static ARP- and/or MAC-Entries? But where to place them, in the core, on the APs?

I would appreciate any help.



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SJessulat_2 Tue, 09/02/2008 - 21:23
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Hi Ken,

the momentary workaround is to add a static arp entry on :

- The AP to which the device is connected,

- The Switches from the backbone to the one where the wlc is connected

- and the WLC (via mac filter)




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