{"id":1306,"date":"2018-09-29T15:52:38","date_gmt":"2018-09-29T08:52:38","guid":{"rendered":"https:\/\/lagonet.vn\/?p=1306"},"modified":"2018-09-29T15:52:38","modified_gmt":"2018-09-29T08:52:38","slug":"route-selection-in-cisco-routers","status":"publish","type":"post","link":"https:\/\/kb.lagonet.vn\/?p=1306","title":{"rendered":"Route Selection in Cisco Routers"},"content":{"rendered":"
\n
Introduction<\/a><\/div>\n
Prerequisites<\/a><\/div>\n
Requirements<\/a><\/div>\n
Components Used<\/a><\/div>\n
Conventions<\/a><\/div>\n
Processes Involved<\/a><\/div>\n
Building the Routing Table<\/a><\/div>\n
Backup Routes<\/a><\/div>\n
Adjusting the Administrative Distance<\/a><\/div>\n
How Metrics Determine the Route Selection Process<\/a><\/div>\n
Prefix Lengths<\/a><\/div>\n
Making Forwarding Decisions<\/a><\/div>\n
IP Classless<\/a><\/div>\n
Summary<\/a><\/div>\n
Related Information<\/a><\/div>\n<\/div>\n

<\/a>Introduction<\/h2>\n

One of the intriguing aspects of Cisco routers, especially for those new to routing, is how the router chooses which route is the best among those presented by routing protocols, manual configuration, and various other means. While route selection is much simpler than you might imagine, to understand it completely requires some knowledge about the way Cisco routers work.<\/p>\n

<\/a>Prerequisites<\/h2>\n

<\/a>Requirements<\/h3>\n

There are no specific prerequisites for this document.<\/p>\n

<\/a>Components Used<\/h3>\n

This document is not restricted to specific software and hardware versions.<\/p>\n

<\/a>Conventions<\/h3>\n

For more information on document conventions, see the\u00a0Cisco Technical Tips Conventions<\/a>.<\/p>\n

<\/a>Processes Involved<\/h2>\n

There are three processes involved in building and maintaining the routing table in a Cisco router:<\/p>\n