The EIGRP Stub Routing feature improves network stability, reduces
resource utilization, and simplifies the stub device configuration on the
spoke. EIGRP Stub routing is commonly used over DMVPN networks having multiple
sites with single device in each site. Site devices acting as stub result in
reducing the query domain thereby enhancing improved performance. On the other
hand, branch EIGRP routing is simple for a single router default-gateway site.
When a the branch adds a second router or becomes larger and needs routing
within the campus the configuration becomes complex.
The EIGRP IWAN Simplification feature implements stub site behavior on
devices that are connected to the WAN interfaces on branch routing via the
configuration of stub site ID on EIGRP address family. Use the
eigrp stub-site command in the address family
configuration mode. The stub site ID is applied to all incoming routes on WAN
eigrp stub-site command is mutually exclusive
eigrp stub command. You cannot execute both
commands on a device. This
eigrp stub-site command resets the peers on
WAN interfaces and initiates relearning of routes from WAN neighbors.
Interfaces connected towards hub or WAN are identified so that routes
learnt through neighbors on such interfaces are part of a list of a given
route. This is achieved via the
stub-site wan-interface command configured in
the address family interface configuration mode.
On the identified interfaces, neighbors treat WAN interfaces as stub.