From the course: Cisco CCNP Enterprise: ENCOR v1.2 (350-401) Cert Prep

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Multicast MAC addresses

Multicast MAC addresses

From the course: Cisco CCNP Enterprise: ENCOR v1.2 (350-401) Cert Prep

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Multicast MAC addresses

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Not only does a multicast group have an IP address, an IP version 4 or an IP version 6 address, it also needs to have a MAC address. Well, where does that MAC address come from? Well, it's actually created based on the IP version 4 or IP version 6 IP address. And in this video, I want to show you how we can construct a MAC address for a multicast group based on that group's IP address. And let's begin with a group that has an IP version four IP address. We've got a multi-guest group with an IP address of 224.1.10.10. How do we calculate the corresponding MAC address? Well, to begin, we take the last three octets in that IP version four address, which in this case is 1.10.10, and we know that an octet has eight bits each. Well, we simply write each octet in its eight-bit binary equivalent. and a one written in eight binary bits would simply be seven zeros followed by a one. So we start out by writing those seven zeros followed by a one, but notice we're gonna put a dot after every four…

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