Local Routes

Sections: 

• Lab Topology
• Configuration

Overview: 

• Local Routes refer to an entry in the router's routing table that represents an IP address assigned to one of its own interfaces 
• Physical interface and loopback addresses are considered a local route entry on a router
  • Note: A loopback address is defined in a logical interface that is always in an up/up state used for management and routing protocol purposes often to represent the router's identity 
• When an IP address or network is assigned on a router's interface, it is automatically added as a local route in the routing table and is essential for the router to route traffic to itself and for network stability
• For example in the topology below, when defining the 3 directly connected networks on R1, local routes will automatically be created representing the IP addresses of the router interfaces themselves
• In this lab scenario, we will define the directly connected networks on R1 and will identify the local routes created 

Lab Topology

Configuration

Local Routes: R1

Notes:

• From R1, we have defined networks on interfaces Gi0/0, Gi0/1, Gi0/2
• You can view any configured IP addresses using the  'show ip interface brief' command
• You can view all available networks using the  'show ip route' command
• From the 'show ip route' command, the 'L' routes indicate local routes of each of the mapped interfaces