cisco ccna 200 301 book

cisco ccna 200 301 book.. Fast convergence.. Loop-free topology .. Variable length subnet mask (VLSM) and route summarization; . Multicast and incremental updates; . Support for multiple protocols being routed. The next few subsections describe some of the features of EIGRP and how it works and is configured.As of IOS 12.3, Cisco no longer supports IGRP, but EIGRP is still supported and widely deployed EIGRP has the following features. . Uses multicast to propagate routing information. . Supports load balancing among six paths to the same destination network and does not require that these paths have the same metric value. . Supports complex metric value structures.. Fast convergence (sends triggered updates when the network topology changes and stores the neighbor's routing table locally) o . Uses incremental updates, so there is little network overhead.20.1.1 Metric values and interoperabilityEIGRP uses the same metric structure as the older native IGRP, which contains bandwidth, latency, reliability, load, and maximum transmission unit (MTU). o By default, metrics are calculated based on bandwidth and latency only, and no other components are used; however, you can manually enable these components to be used in metric calculations.An interesting point is that if some routers in the network are running IGRP and some are running EIGRP, and these routers are configured with the same Autonomous System number, they will share routing information. This makes it easy to migrate from IGRP to EIGRPo share routes between these two routing protocols, the routers must perform metric conversion. Although the two protocols use the same metric components, they store different values.Chapter 20 EIGRP Routing 527EIGRP uses a 32-bit metric, while IGRP uses a 24-bit metric. When integrating the two protocols, passing an EIGRP route to IGRP divides the metric value by 256,which becomes 24-bit, while passing an IGRP route to EIGRP multiplies the metric value by 256,which becomes 32-bit.