Frame-relay Hub and spoke:
Frame-relay Hub and spoke topology is also known as star topology, which have a single hub or central router provides access to different core services and all other routers are connected to this hub are called spoke.
Some characteristic of frame-relay Hub and spoke topology includes:
- You can easily manage hub and spoke topology for connecting your remote offices.
- Hub and spoke topology has the single point of failure if hub-router/device is down then no other routers can communicate with each other.
- You have single pipe or circuit for communication.
- Hub and spoke is not a scalable topology.
For configuration of Hub and spoke topology you can review this example. Frame relay configuration example on GNS3: