depending on the customer needs the ISP can provide:
- a single default route
- a default route and selected routes
- a full internet table
A full internet table provides to the customer the capability to take optimal routing decisions but it requires a powerful router in terms of cpu and memory. (a single full table is in the order of 400,000 routes)
A single default route requires minimal resources but it does not provide to the customer details to take optimal routing decisions ( the customer can use multiple default routes from different ISPs in load balancing).
A partial table is used for providing detailed routes for selected destinations.
These destinations can be: other customers of the ISP or other entities that have important traffic volumes exchanged with the local customer. In this way the customer can use most specific routes to selected destinations.
The generation of a default route can be performed per neighbor using neighbor ... default-originate at the ISP router, the leaking of selected routes is performed using route filters typically implemented with a route-map, no route filters is applied when sending the internet full table
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