Multicast Addresses

• All routers recognize this format => all routers can route multicast packets. Also IGMP part of ICMPv6 => required.

• Flags: T = 0 ? Permanent (well-known) multicast address, 1 ? Transient

• Scope: 1 Node-local, 2 Link-local, 5 Site-local,8 Organization-local, E Global => routers reqd to honor this.

• Predefined: 1 ? All nodes, 2 ? Routers, 1:0 ? DHCP servers

8 bits

4 bits

4 bits

112 bits

Flags

Scope

1111 1111

Group ID

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