Let me preface this with the fact that this is a complete guess. But, it is based on the nature of infrastructure versus client multicast modes for the workgroup-bridge.
The "mobile station" command is used to allow workgroup bridges to scan for and roam to another access point before losing its previous association. With the infrastructure mode, if the WGB doesn't send an acknowldgement that it received a multicast or broadcast packet, the transmitting AP retransmits the frame. So, let's imagine a scenario where a WGB in "mobile station" mode is moving between root APs. The AP that it had been connected to doesn't yet sense that the AP is no longer associated. So, it sends a multicast/broadcast frame. Since the WGB is no longer associated, it won't send an acknowledgement that it received the frame. Thus, the AP will continue to retransmit until it reaches the max retransmit value for the frame. Until then, it is using RF unnecessarily, potentially degrading the performance of other devices in its area. Jason Boyers - CCIE #26024 (Wireless) Senior Technical Instructor - IPexpert, Inc. Mailto: *[email protected] * On Thu, Sep 15, 2011 at 6:14 AM, Leigh Jewell <[email protected]>wrote: > I was reading the WGB section again: > > > http://www.cisco.com/en/US/customer/docs/wireless/access_point/12.3_7_JA/configuration/guide/s37hot.html#wp1040354 > > >> You should use a workgroup bridge as a client device if these conditions >> are true: >> >> • More than 20 workgroup bridges associate to the same access point or >> bridge >> >> • The workgroup bridge associates using an SSID that is not an >> infrastructure SSID >> >> • *The workgroup bridge is mobile * >> > The first one I understand. > > The 2nd one I can confirm with testing it to be the case that if the WGB > isn't on the native VLAN you can't do reliable multicast (i.e > infrastructure-client can't be used on the root). > > The 3rd one I don't understand. I can configure it fine but it says not to > do it. > > Any thoughts on why you wouldn't use reliable multicast with a mobile WGB ? > > Cheers, > Leigh > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
