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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.
Peter, Thanks for the explanation there, I'm a bit curious around the whole stub/transit network definition. See I have read in Routing TCP/IP Volume 1, Second Edition the definition of a transit networks have two or more attached routers where as stub networks have only a single router attached.. where in RFC 2328 under section 2.1 (I've only just skimmed across the RFC looking for this info ...
OSPF is somewhat cumbersome in using the concept of a stub network. By definition, a stub network is a network that is connected to a single router only. In other words, a stub network has only a single OSPF router. An opposite to a stub network would be a transit network that is connected to at least two routers.
In sparse mode, when the stub router relays the IGMP messages to the central site router, a PIM Join message is sent towards the RP by the central site router to join the shared tree and pulls the traffic. The traffic flows over the shared tree to the stub network, even with the stub router not knowing about the RP-to-group mapping.
It helps to first understand what a stub network is when determining whether or not a router could qualify for being a stub router. This concept is a bit more clear with OSPF because a stub area could correspond to a stub network segment. When we think of stub networks we are describing a network that does not provide transit for other networks.
For a stub network, as its connected or has only one exit point, its not required to maintain all the info in its database, which consumes more RAM and processor cycles. So, in order to reduce the processor cycles, Stub, TSA and NSSA configs can be used in OSPF. In EIGRP, stub config can be used.
This is the definition for "Stub networks" in Jeff doyle. "Stub networks have only a single attached router. Packets on a stub network always have either a source or a destination address belonging to that network. That is, all packets were either originated by a device on the network or are destined for a device on the network.
its like this Core/HUB routers dont want to ask to stub/spokes routers for a route suppose 1.1.1.1 to stub who has already advertised its connected subnets which are 2.2.2.0 and 3.3.3.0 . as stub advertise what it has so no core routers will care to query to stub routers for 1.1.1.1 am i understanding it right?
EIGRP STUB. Stub routing is one way to limit queries. A stub router is one that is connected to on more than two neighbors and should be a transit router. The EIGRP stub routing feature improve network stability, reduces resource utilization, and simplifies remote router (spoke) configuration. Stub routing is commonly used in a Hub-and-Spoke ...
The Enhanced Interior Gateway Routing Protocol (EIGRP) stub routing feature was introduced in Cisco IOS Software Release 12.0(7)T. Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network, one or more end (stub) networks are connected to a remote router (the spoke) that is connected to one or more ...