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Recursive Routing Simplified definition

The term recursive in the context of recursive static routes refers to the process where the router has to resolve the next-hop IP address by performing multiple lookups in its routing table.

Here’s how it works:

  1. When a router receives a packet destined for a particular network (e.g., 10.22.22.0/24), it checks its static route configuration.
  2. In the case of a recursive static route, the route specifies a next-hop IP address (e.g., 192.168.1.1) rather than an interface.
  3. The router then needs to look up where that next-hop IP address (192.168.1.1) is located in its routing table to find the outgoing interface.
  4. If the next-hop IP itself requires further resolution (e.g., through another lookup to figure out its outgoing interface), the router has to perform recursive lookups until it resolves the final interface.

In simple terms, recursive means the router must go through multiple steps or lookups (like peeling back layers) to finally determine how to forward the packet.

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