All routing inside the DRG is driven by the contents of DRG route tables. DRG route tables contain rules which route packets to a particular network destination, represented as a DRG attachment. The routing decision for a packet entering a DRG is determined by the rules in the DRG route table assigned to the attachment-of-entry.

Each DRG attachment can inject routes in any DRG route table, provided there is a statement corresponding to the attachment in the route table's importDrgRouteDistribution. You can also insert static routes into the DRG route tables.

The DRG route table is always in the same compartment as the DRG. There must always be a default DRG route table for each attachment type.