Hiện nay, IS-IS đang được sử dụng như một IGP bởi một số nhà cung cấp dịch vụ Internet lớn nhất. Trong hầu hết các trường hợp, một mạng ISP welldefined không cần phải có một bảng định tuyến IGP lớn, nhưng do dự phòng mở rộng, nhân rộng không trở thành một vấn đề. | A If you run your own RP you need to find out whether your provider supports MSDP. If you don t have an RP you may want to inquire about your provider sending auto-RP announcements to your network instead. For Further Reading . . . ftp ipmulticast html l INTERNET-DRAFT. Kumar V. MBONE Interactive Multimedia on the Internet. Indianapolis IN New Riders 1996. Maufer T. Deploying IP Multicast in the Enterprise. Upper Saddle River NJ Prentice-Hall 1998. RFC 1112. Host Extensions for IP Multicast IGMPv1 . RFC 2236. Internet Group Management Protocol Version 2. RFC 2283. Multiprotocol Extensions for BGP-4. RFC 2327. SDP Session Description Protocol . RFC 2362. Protocol Independent Multicast-Sparse Mode Protocol Specification. RFC 2365. Administratively Scoped IP Multicast. 345 Chapter 14. Quality of Service Features After completing your study of routing protocols you now can learn how to provide differentiated levels of service within the network. Routing and differentiated service can be intimately linked indeed some routing protocols provide mechanisms for making different routing decisions based on the desired quality of service QoS . However for improved scalability it is usually better to decouple routing and QoS in large networks. This chapter covers the following issues in relation to quality of service QoS policy propagation This section briefly describes the ways in which QoS policy can be propagated throughout the network. Congestion-management algorithms In this section you learn how routers cope with congestion when it occurs. In particular first-in first-out FIFO priority queuing custom queuing weighted fair queuing WFQ and selective packet discard are described. Congestion-avoidance algorithms Congestion can lead to the inefficient use of network resources. In this section you will learn why and how RSVP or the combination of weighted random early detection rate limiting and BGP policy .
