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ports Only the devices configured to use the multicast address actually process the frame; all other devices drop it The problem of using unicast frames to disseminate certain types of information is that it can negatively impact the performance of your network For instance, imagine that you have a network where you want 10 devices to receive a specific multicast stream, such as a real-time video presentation One solution would be to The three types of frames have the video server use unicasts and send that are always ooded by bridges and 10 copies of the same information to each switches are multicasts, broadcasts, and destination Of course, if the multimedia stream unknown destination unicasts is running at 5 Mbps, then this would require the server to generate 50 Mbps worth of traffic Another solution would be to use a broadcast In this situation, the multicast server generates only one stream of information The problem with this is twofold, however First, the switched infrastructure would flood this traffic to every destination, including the 10 devices that are interested in seeing it, wasting a lot of bandwidth Second, because broadcast frames are addressed FF:FF:FF:FF:FF:FF, each device must waste processing cycles to process them The third solution is to use multicast frames With multicasting, switches also flood the frames; however, they can learn which devices want to receive multicast traffic and therefore forward the multicast frames only to those devices that want to see the multicast traffic This topic is beyond the scope of this book, but it is covered in Cisco s Switching exam for the CCNP certification If you have a large multicast solution deployment, you will definitely want to make sure that your switches support advanced multicast features that allow them to forward multicast traffic intelligently instead of having to flood it You want to have the switch forward multicast frames to end stations that are running a multicast application that need to see the multicast stream you don t want your switch to flood multicasts to all end stations, especially if the multicast traffic is video.

10 11

To help you understand what happens when a switch forwards rather than floods, the example in Figure 4-3 shows a hub and a switch, with various PCs connected to these two devices Let s assume that the switch was just turned on, which means that its CAM table is empty PC-A generates a frame destined for PC-C When the switch receives the frame, it looks in its CAM table and does not see the source MAC

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FIGURE 4-3

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address (00000A01AAAA), so it adds it along with port 1 It also examines the destination MAC address (00000A01CCCC) and does not see this address in its CAM table, so the switch floods the frame out all of its remaining ports: 2, 3, and 4 In this example, the switch did not need to do this because PC-C is connected to the same hub as PC-A; however, the switch doesn t know this yet This is an example of flooding an unknown destination unicast address Figure 4-4 shows an example of the switch adding the entry to its CAM table and flooding the frame You can see from this figure that the switch now has one entry in its CAM table (PC-A s) as well as the flooding process that it performed Since the destination, PCC, is connected to the same hub as PC-A, it obviously receives the frame PC-C now responds back to PC-A with a unicast frame: the source MAC address is 00000A01CCCC and the destination MAC address is 00000A01AAAA The switch performs its learning process, and since PC-C s MAC address is not in its CAM table, it adds it, as is shown in Figure 4-5 Now the switch has two entries in its CAM table: PC-A s and PC-C s To perform the forwarding process, the switch examines the destination MAC address, 00000A01AAAA It finds a match in its CAM table and finds that the destination MAC address is associated with the same port as the source MAC address of PC-C s Therefore, the switch drops the frame: it does not forward it out of any of its ports, as can be seen from Figure 4-5

1 2 3

FIGURE 4-4

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