Section 4. Implementing an EIGRP-Based Solution
Enhanced Interior Gateway Routing Protocol (EIGRP) was introduced in Cisco IOS Release 9.21 as an enhancement to the limitations of IGRP. IGRP was developed by Cisco in the mid-1980s as a solution to Routing Information Protocol’s (RIP’s) limitation. RIP’s limitation was based on its metric of hop count. In RIP, a hop larger than 15 was unreachable. As a result, RIP networks could contain no more than 15 hops. IGRP was developed to support larger networks than RIP. IGRP can support networks up to 255 hops in diameter. Additionally, IGRP could support multiple routed protocols. IGRP was created to support not only IP but also Internetwork Packet Exchange (IPX) and AppleTalk; RIP supports only IP. ...
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