r1 and r2 are running OSPF in area 0. They have established a neighbor adjacency over a single serial interface. Configure LSAs on this adjacency to set the DoNotAge bit.
r1 is a high-end router running RIP on it’s connection to the low-speed router r2. The site engineer for r2 has noticed that the routing table on r2 is losing RIP routes. He thinks that your r1 is sending RIP updates too quickly for r2 to process. Configure r1 to implement a 25 millisecond delay between RIP packets.
RIP will send up to 25 RIP routes per RIP update packet. By default, these packets will be sent with no delay between packets. In order to implement a delay between the packets you can use the ‘output-delay’ command under the RIP process.