From the course: Cisco CCNP ENARSI v1.1 (300-410) Cert Prep: 1 Layer 3 Technologies

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PBR fundamentals

PBR fundamentals

From the course: Cisco CCNP ENARSI v1.1 (300-410) Cert Prep: 1 Layer 3 Technologies

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PBR fundamentals

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- In this video we want to take a look at something called PBR, or Policy-Based Routing. To understand how Policy-Based Routing works, let's contrast it with traditional routing. With traditional routing, a frame comes into the router and the router is going to to look at the layer two header. And it's going to check out that frame check sequence to make sure the frame has not been corrupted in transit. Assuming all looks good, it's going to remove that Layer 2 header. And that exposes the layer 3 header which has a destination IP address. And the router is going to take a look at that destination IP address and make a forwarding decision based on that router's IP routing table and it's going to send the frame on its way. However, there may be times when we want to do something different than the IP routing table would have us do. Perhaps for performance reasons, for security reasons, for some sort of design reason, we…

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