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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 interfaces.

Note	The eigrp stub-site command is mutually exclusive with the 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.

Note	On the identified interfaces, neighbors treat WAN interfaces as stub.

1.    enable


2.    configure terminal


3.    router eigrp virtual-instance-name


4.    Enter one of the following:

• address-family ipv4 [multicast] [unicast] [vrf vrf-name] autonomous-system autonomous-system-number
• address-family ipv6 [unicast] [vrf vrf-name] autonomous-system autonomous-system-number

5.    network ip-address [wildcard-mask]


6.    eigrp stub-site


7.    af-interface interface-type interface-number}


8.    stub-site wan-interface


9.    end


10.    show ip eigrp vrf vrf-name topology [ip-address [mask]]

Device> enable

Device# configure terminal

Device(config)# router eigrp virtual-name1

Device(config-router)# address-family ipv4 autonomous-system 45000

Device(config-router)# address-family ipv6 autonomous-system 45000

Device(config-router-af)# network 172.16.0.0

Device(config-router-af)# eigrp stub-site 101:100

Device(config-router-af)# af-interface gigabitethernet 0/0/1

Device(config-router-af-interface)# stub-site wan-interface

Device(config-router-af-interface)# end

Device# show ip eigrp vrf vrf1 topology 109.1.0.6/32

Device# show ip eigrp vrf vrf1 topology 109.1.0.6/32

EIGRP-IPv4 Topology Entry for AS(1)/ID(109.1.0.2) VRF(vrf1)
EIGRP-IPv4(1): Topology base(0) entry for 109.1.0.6/32
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2713600
  Descriptor Blocks:
  104.1.1.58 (Tunnel1), from 104.1.1.1, Send flag is 0x0
      Composite metric is (2713600/1408256), route is Internal
      Vector metric:
        Minimum bandwidth is 100000 Kbit
       Total delay is 105000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 200
        Hop count is 2
        Originating router is 109.1.0.6
      Extended Community: StubSite:101:100