What is a stub router in EIGRP?
Stub routing is an EIGRP feature primarily designed to conserve local router resources, such as memory and CPU, and improve network stability. The stub routing feature is most commonly used in hub-and-spoke networks. The router will send Query packets the stub router if it needs information about a route or routes.
What are stub routers?
Per Wiki: A Stub router, One-armed router or router on a stick is a router that routes traffic between virtual local area networks (VLANs). It has only a single Ethernet NIC that is part of two or more Virtual LANs, enabling them to be joined.
How does EIGRP Stub work?
Meaning, EIGRP stub routers are designed for very small branch office routers or for edges of the network. By setting a router as a stub, it’s neighbours will then suppress sending any queries to the stub router since edge routers shouldn’t have backup paths to a particular network if it isn’t in transit for traffic.
Why do we need stub area?
Stub Areas This ensures that routers in the stub area will be able to route traffic to external destinations without having to maintain all of the individual external routes. Because external routes are not received by the stub area, ABRs also do not forward type 4 LSAs from other areas into the stub.
How do I set up a stub area?
To configure OSPF stub areas:
- On all routing devices in the area, configure an OSPF stub area.
- On the ABR, inject a default route into the area.
- (Optional) On the ABR, restrict summary LSAs from entering the area.
- If you are done configuring the devices, commit the configuration.
How to advertise default route in EIGRP-Cisco?
Use Default Route and Redistribution This method describes how to advertise default route in EIGRP with the use of static default route: Note: In this situation, a network statement cannot be used inside EIGRP in order to advertise 0.0.0.0 because it is not directly connected.
Are there any routers that don’t use EIGRP?
Here routers R1, R2 and R3 are configured with EIGRP and no EIGRP runs in between R3 and R4. ! ! ! ! Method 1. Use Default Route and Redistribution This method describes how to advertise default route in EIGRP with the use of static default route:
How does the EIGRP stub routing feature work?
The EIGRP stub routing feature can prevent this problem by preventing the remote device from advertising core routes back to the distribution devices. In the above example, routes learned by the remote device from distribution Device 1 will not be advertised to distribution Device 2.
How is EIGRP used in hub and spoke?
EIGRP Stub Routing. The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. Stub routing is commonly used in hub-and-spoke network topologies. In a hub-and-spoke network, one or more end (stub) networks are connected to a remote device (the spoke)…