tailieunhanh - The Illustrated Network- P39

The Illustrated Network- P39:In this chapter, you will learn about the protocol stack used on the global public Internet and how these protocols have been evolving in today’s world. We’ll review some key basic defi nitions and see the network used to illustrate all of the examples in this book, as well as the packet content, the role that hosts and routers play on the network, and how graphic user and command line interfaces (GUI and CLI, respectively) both are used to interact with devices. | CHAPTER 14 IGPs RIP OSPF and IS-IS 349 Since 2007 ASNs are allocated as 4-byte values. Because each field can run from 0 to 65535 the current way of designating ASNs is as two numbers in the form . The full range of ASNs now is from to 0 to 4 294 967 295 in decimal . For example is how the former 2-byte ASN 65535 would be written today. In this book we ll drop the leading 0 and just use the legacy 2-byte AS format for Ace and Best ISP 65459 and 65127. Now let s see what it takes to get RIPng up and running on these routers. So far the link-local fe80 addresses have been fine for running ping and for neighbor discovery from router to host but these won t be useful for LAN1 to LAN2 communications with IPv6. For this we ll use routable fc00 private ULA IPv6 addresses. Once we get RIPng up and running with routable addresses on our hosts and routers we should be able to successfully ping from LAN1 to LAN2 using only IPv6 addresses. While we ll be configuring IGPs on both Ace and Best ISP s AS routing domains we won t be running IGPs between them. That s the job of the EGP Border Gateway Protocol or BGP and we ll add that in Chapter 15. We need to create four routable IPv6 addresses and prefixes two for the hosts and two for the router s LAN interfaces both are fe-1 3 0 . We ve already done this in Chapter 4. The site IPv6 addresses and the IPv4 and MAC addresses used on the same interfaces are shown in Table . We don t need to change the link-local addresses on the link between the routers because well they are link-local. We know from Chapter 13 that we have these IPv6 addresses configured on winclil and wincli2. We have to do three things to enable RIPng on the routers Configure routable addresses on interface fe-1 3 0 Configure the RIPng protocol to run on the site customer-edge routers CE0 and CE6 the provider-edge routers PE5 and PE1 and the internal links on the providerbackbone routers P9 P7 P4 and P2 . Create and apply a

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