Q: What is ODR ?
A: On-Demand Routing is not a routing protocol. It uses Cisco Discovery Protocol (CDP) to propagate the IP prefix. ODR is a perfect solution for hub and spoke topology when the spoke routers act as stub routers by connecting to no other router other than the hub. If you only use Cisco routers in your network, running Cisco IOS® 11.2 or later, you can use ODR. If you are running dynamic protocols (for instance, if you are an ISP), ODR is not suitable for your network environment
Q: How can I configure ODR ?
A: Configure the router odr command in the hub router and turn off any dynamic routing protocols in the spoke routers. Spoke routers automatically start to advertise their subnets using CDP. You do not need the router odr command on spoke routers
More info about ODR ? Check on this link
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