Routing Table Codes

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Understanding routing table codes is crucial for network engineers to efficiently manage and troubleshoot networks.

Here are some key routing table codes:-

1. C (Connected): Represents directly connected networks.
2. L (Local): Refers to local IP addresses configured on the router's interfaces.
3. D (EIGRP): Indicates routes learned via the EIGRP dynamic routing protocol.
4. S (Static): Denotes manually configured static routes.

👉 C (Connected Route): Indicates directly connected networks, eliminating the need to forward packets through another router. For example : If a router has an interface with IP 192.168.1.1/24, it will have a connected route to the 192.168.1.0/24 network.It Indicates that the network is directly reachable via one of the router's physical interfaces.

👉 L (Local Route): Refers to local IP addresses configured on a router's interface, ensuring correct routing for packets destined to the router's IP addresses. It always has a /32 mask and the routers determine them automatically.If a router has the IP address 192.168.1.1 on an interface, the local route 192.168.1.1/32 will be created for that interface. The benefit of having this local route is you can easily detemine the IP address of the interface without executing the command show ip interface brief.

👉 D (Dynamic Route - EIGRP): Represents routes learned dynamically through the EIGRP protocol, distinguishing them from statically configured routes. Example : If two routers are running EIGRP and one advertises a route to the other, the receiving router will mark this route as D in its routing table.

👉 S (Static Route): Denotes manually configured static routes, often used for specific networks or as backups for dynamic routes. Example : A static route like S 10.0.0.0/24 via 192.168.1.2 might be used to tell the router to forward traffic destined for 10.0.0.0/24 to the next-hop IP 192.168.1.2.

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