The multicast question

Wireless Multicast with Cisco WLC

Recently the question of multicast over Wi-Fi came up again at the office, so it was time to set it up and see what happens. All the configuration and test results are documented below.

The basic lab setup.

First, we need to remember that sending multicast to the AP requires multicast communication between WLC and AP. This means the LAN needs to be multicast enabled, otherwise this will just not work. This is less of an issue in a small lab such as this as everything can be on the same VLAN, but on larger networks this is unlikely to be the case.

Once the LAN is multicast ready we can move on to WLC configuration, and we see that there is actually very little of it.

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Wireless QoS, a little history

Quality of Service is a complex and often misunderstood topic, more so when it comes to wireless networks, as wireless and radio technologies are often misunderstood in general. Combining the two (that is QoS & 802.11 Wi-Fi) gives us a good place to start with the first post on this site. As this could be a lengthy write-up we will break it up into a number of posts, let’s begin with a bit of history and understanding what goes on when packets are transmitted over the air.

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