EIGRP Stub Routing

Normally a hub-and-spoke technology

Deployed at the spoke sites
Simplifies EIGRP config
Prevents a stub site from being used as transit
Stubs do not advertise routes they learn from other neighbors
Useful to limit the scope of a EIGRP query domain
- Stub router replies to queries with inaccessible
  - Connected
  - Redistributed Static
  - External
  - Internal

More details on page 174 of BRKENT-1187

Commands

Stub

Advertise

Connected
Static
Summary

Stub Static Connected

Advertise

Connected
Static

Do not advertise

Summary

Stub Summary

Advertise

Summary

Do not advertise

Connected
Static

Stub Receive-Only

Do Not Advertise

Connected
Static
Summary

Two routers per site

Taken from BRKENT-1187, pg 183.

Uses IWAN simplification so the stub routers can advertise routes to each other.

I haven’t tested this.

Topology

                                        
       ┌─────┐           ┌─────┐        
       │ Hub │           │ Hub │        
       │  A  │           │  B  │        
       └──┬──┘           └──┬──┘        
0.0.0.0/0 │                 │ 0.0.0.0/0 
          │                 │           
        │ │                 │ │         
        │ │                 │ │         
        ▼ │                 │ ▼         
       ┌──┴──┐           ┌──┴──┐        
       │Stub │           │Stub │        
       │  C  ├───────────┤  D  │        
       └─────┘           └──┬──┘        
                            │           
                        ────┴────       
                       10.1.1.0/24

Config

!
! C and D must share the same stub-site ID.
!
router eigrp ROCKS
  address-family ipv4 unicast autonomous-system 1
    af-interface Tunnel100
      hello-interval 20
      hold-time 60
      stub-site wan-interface
    exit-af-interface
!
    topology base
    exit-af-topology
    network 10.0.0.0
    eigrp router-id 10.1.1.1
    eigrp stub-site 1:1
  exit-address-family

References

Cisco Live - EIGRP Introduction and Overview - Steven Moore - BRKENT-1187

Cisco - EIGRP IWAN Simplification - IP Routing Configuration Guide, Cisco IOS XE 17.x

IP Routing Configuration Guide, Cisco IOS XE 17.x - EIGRP Stub Routing Cisco IOS XE 17 - Cisco

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