Figure does not show all types of multicast addresses but is used to indicate the three multicast addresses this book focuses on. An IPv6 multicast address defines a group of devices known as a multicast group. A packet sent to a multicast group always has a unicast source address.
A multicast address can never be the source address. Unlike IPv4, there is no broadcast address in IPv6. Instead, IPv6 uses multicast, including an all-IPv6 devices well-known multicast address and a solicited-node multicast address. Figure shows the structure of an IPv6 multicast address. The first 8 bits are 1-bits ff , followed by 4 bits allocated for flags and a 4-bit Scope field.
The Scope field defines the range to which routers can forward the multicast packet. The next bits represent the Group ID. Figure IPv6 Multicast Address. The 4 bits following represent four different flags. The first three flags, 0 reserved , R rendezvous point , and P network prefix , are beyond the scope of this book. The fourth flag, the least significant bit LSB , or rightmost bit, is the transient flag T flag.
The T flag denotes the two types of multicast addresses:. Permanent 0 : These addresses, known as predefined multicast addresses , are assigned by IANA and include both well-known and solicited multicast.
They are assigned by multicast applications. As shown in Figure , there are two types of predefined multicast addresses, both of which use the Flag field with a 0x0 value:.
As shown in Figure , this means that the third hexadecimal digit, the Flag field, is always set to 0. Well-known multicast addresses are predefined or reserved multicast addresses for assigned groups of devices. These addresses are equivalent to IPv4 well-known multicast addresses in the range Some examples of IPv6 well-known multicast addresses include the following:.
Solicited-node multicast addresses are automatically created for every unicast address on a device. Multicast addresses, the Scope field, assigned multicast, and solicited-node multicast are discussed in detail in Chapter 7. I would like to receive exclusive offers and hear about products from Cisco Press and its family of brands. I can unsubscribe at any time.
Pearson Education, Inc. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.
To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:.
For inquiries and questions, we collect the inquiry or question, together with name, contact details email address, phone number and mailing address and any other additional information voluntarily submitted to us through a Contact Us form or an email.
We use this information to address the inquiry and respond to the question. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.
Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites; develop new products and services; conduct educational research; and for other purposes specified in the survey.
Occasionally, we may sponsor a contest or drawing. Participation is optional. INE is the premier provider of technical training for the IT industry. INE is revolutionizing the digital learning industry through the implementation of adaptive technologies and a proven method of hands on training experiences. Our portfolio of trainings is built for all levels of technical learning, specializing in advanced networking technologies, next generation security and infrastructure programming and development.
Want to talk to a training advisor about our course offerings and training plans? Give us a call at or email us at sales ine. Our staff is looking forward to assisting you! Please call Outside US: or fill out the form below to have a training advisor contact you. Stay connected with the latest news, product releases and promotions from INE by subscribing to our Newsletter. All Rights Reserved — Terms of Service — Privacy Policy All logos, trademarks and registered trademarks are the property of their respective owners.
IPv6 Multicast - Addressing 3 Comments. New Blog Posts! Typically, the interfaces of the multicast group are on different nodes. An interface can belong to any number of multicast groups. Packets sent to the multicast address go to all members of the multicast group.
For example, one use of multicast addresses is for broadcasting information, similar to the capability of the IPv4 broadcast address.
0コメント