Switching White Papers
IP-Multicasting Technology Part 2: Switches vs. Routers
Overview One of the primary difficulties encountered in multicasting over Layer-2 switches (or bridges) is that the normal response to multicast traffic is the immediate flooding of the packets to every interface on the switch (other than the interface from which the packet arrived). This response is typical of a switch when either a multicast or broadcast MAC address is identified in the destination field of an Ethernet packet. If, somehow, the switch could determine which interfaces should be used for egress processing, the amount of unwanted multicast traffic could be drastically reduced. Thus, our question becomes: how can a switch determine the appropriate output interfaces for a particular multicast? To do so, the switch must access the type of information that is available within the IGMP protocol.
| Publisher | Intelligraphics | File Format | HTML |
|---|---|---|---|
| Date Published | May 2009 | Downloads | 19 |
| Format | White Papers | ||
| Topics | |||
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