Cisco Catalyst 4500 series Administration Manual page 856

Configuring EIGRP Stub Routing
Figure 34-5
Corporate
network
Figure 34-5
Both distribution routers maintain routes to the corporate network and stub network 10.1.1.0/24.
Dual-homed routing can introduce instability into an EIGRP network. In
1 is directly connected to network 10.3.1.0/24. If summarization or filtering is applied on distribution
router 1, the router advertises network 10.3.1.0/24 to all of its directly connected EIGRP neighbors
(distribution router 2 and the remote router).
Figure 34-6
Corporate
network
Figure 34-6
network 10.3.1.0/24 and network 10.2.1.0/24.
If the 10.2.1.0/24 link between distribution router 1 and distribution router 2 has failed, the lowest cost
path to network 10.3.1.0/24 from distribution router 2 is using the remote router (see
route is not desirable because the traffic that was previously traveling across the corporate network
10.2.1.0/24 is now sent across a much lower bandwidth connection. The over utilization of the lower
bandwidth WAN connection can cause a number of problems that might affect the entire corporate
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
34-16
Simple Dual-Homed Remote Topology
Distribution
router 1
(hub)
Distribution
router 2
(hub)
shows a simple dual-homed remote with one remote router and two distribution routers.
Dual-Homed Remote Topology With Distribution Router 1 Connected to Two
Networks
10.3.1.0/24
Distribution
router 1
(hub)
Distribution
router 2
(hub)
shows a simple dual-homed remote router where distribution router 1 is connected to both
Chapter 34
Remote
router
(spoke)
Figure
Remote
router
(spoke)
Configuring Layer 3 Interfaces
34-6, distribution router
Figure 34-7). This
OL_28731-01