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Chapter 1 - Introduction to IP Multicasting

Cisco Multicast Routing & Switching
William R. Parkhurst
  Copyright © 1999 The McGraw-Hill Companies

Outline of the Book
The presentations of the solutions to the requirements stated above comprise the remainder of this book. Chapter 2 presents the unicast and multicast IP addressing scheme in detail. Chapter 3, “Internet Group Management Protocol,” deals with the Internet Group Management Protocol (IGMP), the protocol that is used between hosts and routers to report dynamic multicast group membership.
Chapter 4, “Cisco Group Management Protocol,” discusses a proprietary Cisco protocol for determining group membership on a switch. The protocol, Cisco Group Management Protocol (CGMP) is used to limit multicast traffic on a virtual LAN (VLAN) to those hosts that wish to receive it.
Chapter 5, “Distance Vector Multicast Routing Protocol,” begins the study of multicast routing protocols with the Distance Vector Multicast Routing Protocol (DVMRP), which is used on the Internet Multicast Backbone (MBONE). Cisco does not support a full DVMRP implementation but can interact with DVMRP for the exchange of routes from the MBONE into the local environment.
Chapter 6, “Protocol Independent Multicast — Dense Mode,” and Chapter 7, “Protocol Independent Multicast — Sparse Mode,” cover two flavors of the Protocol Independent Multicast (PIM) protocol. The first is referred to as PIM Dense Mode (PIM-DM). PIM-DM is typically used in a LAN environment, while the second flavor, PIM Sparse Mode (PIM-SM), is appropriate for Wide Area Networks (WAN). Both PIM-DM and PIM-SM have implementations on Cisco routers.
Connecting DVMRP and PIM networks is covered in Chapter 8, “PIM-DVMRP Networks.” Because the MBONE runs DVMRP and Cisco implements PIM, a mechanism is needed for DVMRP-PIM interaction.
Multicast configuration commands that can be used with any of the Cisco-supported multicast routing protocols are discussed in Chapter 9, “Multicast Support Commands.” Chapter 10, “Resource Reservation Protocol,” takes us from multicast routing protocols to a protocol that is not used for routing but for reserving resources along the path from a multicast sender to a multicast receiver. The Resource Reservation Protocol (RSVP) is an Internet control protocol that can be used by multicast receivers to request a specific quality of service (QOS) for the data flow from a unicast or multicast source.
In each chapter that covers a Cisco-supported protocol, all Cisco router commands for configuring, monitoring, and debugging the protocol are presented with network scenarios to demonstrate their use. This is where I believe the value of this book becomes evident. Although the information for the specific routing protocols is contained in the appropriate Request for Comment (RFC) and extensive documentation exists from Cisco for multicast router configurations, I hope my explanations and examples will be used to supplement this information and fill in any gaps that may exist.

 


 
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