What is the default Hello interval of a DIS in a broadcast network?

In a broadcast network, the Designated Intermediate System (DIS) uses Hello packets to establish and maintain adjacency with other routers. The default Hello interval for a DIS is 3 seconds. This short interval allows for quick detection of neighbor status changes, ensuring that the network can adapt promptly to topology changes or failures.

Having a 3-second interval aids in maintaining an efficient and stable network environment, as it ensures that routers can quickly participate in routing decisions and adapt to any changes in the network. This is particularly important in dynamic broadcast environments where latency and network reliability need to be optimized.