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Extra info for IPv6 Advanced Protocols Implementation, 2007 Edition
4 Introduction to RIPng The RIPng protocol is based on the distance-vector algorithm commonly known as the BellmanFord algorithm. Consider the example in Figure 1-8. Router RT-1 advertises its directly connected network N-1 of prefix 2001:db8:0:1000::/64 with a metric of 1 on the point-to-point links to RT-2 and RT-3. The costs of the links from RT-1 to RT-2 and RT-3 are 1 and 3 respectively, which have RT-2 and RT-3 advertise the same prefix on networks N-2 and N-3 (where router RT-4 resides) but with different metrics.
This is one reason that the link-state algorithm has a fast convergence rate. In conclusion, the distance-vector algorithm sends global routing information (a router’s entire routing table) locally, while the link-state algorithm floods local information (attached interfaces and links) globally. 4 Introduction to RIPng The RIPng protocol is based on the distance-vector algorithm commonly known as the BellmanFord algorithm. Consider the example in Figure 1-8. Router RT-1 advertises its directly connected network N-1 of prefix 2001:db8:0:1000::/64 with a metric of 1 on the point-to-point links to RT-2 and RT-3.
After processing the routing messages from RT-2 and RT-3, RT-4 FIGURE 1-8 RT-6 RT-5 N-4 RT-4 1 2001:db8:1:1::/64 1 2001:db8:2:2::/64 N-2 N-3 RT-2 RT-3 3 1 RT-1 1 2001:db8:0:1000::/64 N-1 Example of RIPng route propagation. 4 Introduction to RIPng 11 selects the route with the smaller metric and chooses RT-2 as the next hop to reach network 2001:db8:0:1000::/64 with a metric of 2. RT-4 adds the cost of its network to the received metric and advertises that prefix with a metric of 3 on network N-4.