ccna 200 301 objectives

ccna 200 301 objectives.In this section we will briefly describe the LSDBs and LSAs in the region, which are again similar to those used by OSPFV2. We will then introduce a relatively rare configuration that allows two routers to be neighbors for a short period of time while causing the topology switching process to fail. Verifying OSPFv3 LSAsOSPFv3 uses the same concept, except that the naming is slightly different from OSPFv2's types 1, 2, and 3 LSAs. As explained in Chapter 8, OSPFv2 uses Type 1 Router LSAs and Type 2 Network LSAs to define the topology within a region. The type 3 summary LSA will describe a subnet of a region, with subnets existing in different regions --------------------------------------------- across regions, if you need them.For the OSPFv2 configuration options in this book, the OSPFv2 LSDB requires only these three types of LSAOOSPFv3 retains these same three LSA concepts but renames the sink LSAs.The following list summarizes these three key OSPFv3 LSA types and the reasons why OSPFv3 routers create them. ,words*. A router LSA (type 1LSA),for each router in the region (including ABRs connected to the region). Program ulcer. A network LSA (type 2LSA) for a network containing DRs and DR neighbors.Multiple cross-region prefix LSAs (type 3LSA) for individual IPv6 prefixes (subnets) on different regions.For example, in the examples throughout this chapter, region 4 has two routers: internal router R4 and ABRR1O Therefore, the region 4 LSDB will have router LSAs for each router. in that region, a network exists that DR will use for that region (the Ethernet WAN between R1 and R4). r1 and r4 will also be neighbors, so a network LSA will be created for that network. Finally, ABR R1 will be aware of five different IPv6 prefixes that exist outside of region 4, such that ABR R1 should create and transmit five multi-region prefix LSAs to region 4. Figure 17-6 shows the conceptual model of an LSA in region 4.17.2 Base Content 365 Figure 17-6 Types 1, 2, and 3LSA in Region 4 In addition to this basic LSA structure, 0SPFv3 does make some changes to LSAs compared to OSPFv2. Details within the LSA have changed, and OSPFv3 adds some new LSA types that were not seen in OSPFv2. However, these details are beyond the scope of this book. Tip: When this book was published in 2013, the then official CCNP ROUTE certification guide did not include the LSA differences between OSPFv2 and OSPFv3.To view the LSAs in Figure 17-6 in the actual router, Example 17-11 lists the beginning of zone 4LSDB, which is present on router R4. The example highlights the title, as well as the IPv6 prefix of the interval prefix LSA. Note that the output does show two router LSAs, one line for a single network LSA, and five lines for the interval prefix.Example 17-11 Viewing the Contents of an LSDB in Zone 4 from R4R4# show ipv6 ospf database