notes: ODR

On-Demand Routing (ODR) uses Cisco Discovery Protocol (CDP) to advertise connected IP routes of a stub router to the hub. The hub router then advertises a default IP route back to the spokes via CDP. Assuming that the hub and spokes are already running CDP, the configuration of this feature requires only one command on the hub.

admin distance of 160.

Note: no routing protocols allowed on "stub".


command

router odr

On Demand Routing ODR

- simplest of the routing protocols/ works with CDP
- for hub and spoke deployment
- configuration is on the hub only
- hub learns specific routes, spokes learn default route

for frame-relay , must enable CDP.
on hub: on subinterface - put it in the subinterface.

Note: if you enable any ip routing at spokes, ODR will ceases to work.