BGP后门链路（Backdoor）实际案例
Cisco提供一种方式强IGP路由优先于EBGP路由。这个概念也即是“后门链路”(backdoorlink)。EBGP路由能够标记为后门链路，它将设置这些路由的管理间隔与BGP本地或200一样。由于这个管理间隔要高于IGP，所以首选IGP路由。(Cisco provides a way for strong IGP routes to take precedence over EBGP routes. This concept is also known as "backdoor link". EBGP routes can be marked as backdoor links, which will set the administrative interval for these routes to be the same as BGP local or 200. Since this administrative interval is higher than IGP, IGP routing is preferred.)
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