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[路由交换RS] 上百页思科官方英文教材 Cisco CCNP认证 老版本教材 BSCI Official Exam 英文版
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上百页思科官方英文教材 Cisco CCNP认证 老版本教材 BSCI Official Exam 英文版
节选 Configuring EIGRP Routers are able to route IP out of the box, but you need to configure static routes or a routing protocol so they can reach networks that are not directly connected. EIGRP is classless, meaning that it advertises both a prefix and a mask with each route. Classless routing protocols are also able to arbitrarily summarize. EIGRP summarizes automatically at classful network boundaries, but you will also want to summarize within your network. EIGRP can summarize at any interface on any router, and summarization is extremely important in building a scalable EIGRP network. The commands for EIGRP are similar to IP routing protocols. This section covers the following: ■ Required commands for configuring EIGRP ■ Optional commands for EIGRP ■ Optional EIGRP commands specific to WANs Required Commands for Configuring EIGRP Like other interior routing protocols, the template for an EIGRP configuration involves turning on the protocol and identifying participating interfaces. EIGRP also uses an autonomous system (AS) to group routers. To run EIGRP, you must enable the following three items: ■ The EIGRP process—The routing protocol needs to be started on the router. ■ The EIGRP autonomous system number—Routers in the same administrative domain should be identified and grouped by a common AS number. This 16-bit number is arbitrary. Organizations that have a BGP AS will sometimes use that number; others just make up a number or use “AS 1.” The significance of the AS is that a router will not become a neighbor with a router in a foreign AS. ■ Participating router interfaces—You can activate EIGRP on some or all interfaces. For instance, a router might run EIGRP on internal interfaces and BGP on external interfaces.
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发表于 2013-12-30 23:29:37
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发表于 2013-12-31 11:29:00
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