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Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide
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To further understand how routers make their decisions when it comes to forwarding packets between networks, it's important to understand each component of the routing table within a Cisco IOS router. In this section, we will cover all the essential components that are part of the routing table, including:
Let's start with routing protocol codes.
When you execute the show ip route
command on a Cisco router, the very first thing you will see is a concise list of codes. These codes are formally referred to as routing protocol codes. Each code is used to help you identify how a route has been learned and added to the routing table.
The following snippet shows the routing protocol codes of a Cisco IOS router:
Figure 7.8 – Routing protocol...