ccna 200 301 official cert guide library

ccna 200 301 official cert guide library.Troubleshooting IPv6 Routes Added by OSPFV3If a problem seems to be related to IPv6 routing, the problem can be grouped into two broad categories. First, the router may be missing routes because of some prefixes, so the router will drop packets and the ping will fail. Second, the router may have a working route, but it is using a suboptimal route to the destination. (Chapter 16, "Troubleshooting IPv6 Selective Routing," in the section "Route Trace Shows Some Next Hops, But All Fail" discusses a third type, which contains routing loops.)For example, in Figure 17-9, router R1 has two routes to subnet 33, which is an IPv6 subnet outside of router R3. The top route looks better, at least in terms of the number of routers between R1 and subnet 33. If R1 has no routes to the subnet at all11.3 Exam Prep 369 33 route, you might need to look for one root cause, but if Rl uses this route through five routers below, you might want tolook for a different root cause.Subnet 33Suboptimal Routing? Figure 17-9 Comparing Longer and Shorter Routes from R1 to Subnet 33 When a router has no routes to a given subnet-let's say, if R1 has no routes to subnet 33 at all-perform the following steps. Step 1 Check the router that has interfaces directly connected to the IPv6 prefix. The router must make OSPFv3 start on 1. its total that interface before OSPFv3 broadcasts the subnet.Step 2 Check the OSPFv3 neighbor relationships for all routers between the local router and the router whose interface is connected to IPv6 prefix X. For example, in Figure 17-9, if router R3 does not have the ipv6 ospf process-id area area-id command on its LAN interface. all seven routers have a working neighbor relationship. but R3 still cannot broadcast subnet 33.If the router has a route but it appears to be an incorrect (suboptimal) route, perform the following steps. , Speech S Step 1 Check for broken neighbor relationships on the optimal path that should be the local route to prefix Y. Sprawl Step 2 On the optimal path, check the OSPFv3 overhead setting for the interface.For example, in Figure 17-9, assume that R1 does have a route for subnet 33 that points to the route below, with R4 as its next hop. The underlying reason for this option is shown below.