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Wireless subnet size with multicasting

Unanswered Question
Feb 21st, 2012
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I'm configuring multicasting on one (out of five) of my customers SSIDs (multicasting is configured on the wired LAN, so I'm using multicast mode for multicast forwarding).

Currently we're mainly using /23 and /22 to accomodate wireless clients, but I'm considering to reduce that size on this specific subnet to /24 in combination with VLAN select because of the implementation of multicasting in this voice WLAN.

Because of the following sentence in the 7.2 configuration guide, I'm wondering if I have to reduce the subnet size on all VLANs (bound to the other non multicast WLANs) too?


Access points in the multicast group receive the packet and forward it to all the BSSIDs mapped to the interface on which clients receive multicast traffic. From the access point perspective, the multicast appears to be a broadcast to all SSIDs.

Any suggestions on how to interpret that sentence (or how wrong I am )?



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johanlam Thu, 04/26/2012 - 06:51
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Heard from Cisco SE: /22 or /23 is still a valid choice in this scenario.


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