Differentiate between route summarization and route aggregation.

Route summarization and route aggregation are terms used in the context of routing in computer networks. While they are related concepts, they refer to different aspects of managing and optimizing routing information. Let's differentiate between route summarization and route aggregation:

  1. Route Summarization:
    • Definition: Route summarization, also known as route summarization or route summarization, involves consolidating a group of contiguous subnets or IP addresses into a single, more general address range.
    • Purpose: The primary goal of route summarization is to reduce the size of the routing table. By representing a range of IP addresses with a single summary route, the number of entries in the routing table is decreased, which helps in improving the efficiency of routing protocols and reducing memory and processing requirements.
    • Example: If a router has routes for subnets,, and, summarizing these routes into a single route would be a form of route summarization.
  2. Route Aggregation:
    • Definition: Route aggregation is a broader term that encompasses various techniques to consolidate and manage routing information, and it includes route summarization as one of its methods. It involves combining multiple routes into a more generalized route, often at network boundaries.
    • Purpose: The main purpose of route aggregation is to reduce the number of routing table entries and conserve network resources. By aggregating routes, routers can exchange more concise routing information, leading to more efficient routing operations.
    • Example: In addition to summarizing routes within an Autonomous System (AS), route aggregation can involve consolidating routes at the border routers between different ASs. For instance, a router at the edge of an AS may aggregate multiple routes into a single summary route before advertising it to an external neighboring AS.