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Configuring IP Unicast Routing
Configuring EIGRP
EXAMPLE
The following example configures EIGRP to apply authentication to address-family autonomous system 1 and identifies
a key chain named SITE1:
Switch(config)# router eigrp virtual-name
Switch(config-router)# address-family ipv4 autonomous-system 1
Switch(config-router-af)# af-interface ethernet0/0
Switch(config-router-af-interface)# authentication key-chain SITE1
Switch(config-router-af-interface)# authentication mode md5
Configuring EIGRP Stub Routing
The EIGRP stub routing feature reduces resource utilization by moving routed traffic closer to the end user. In a network
using EIGRP stub routing, the only allowable route for IP traffic to the user is through a switch that is configured with
EIGRP stub routing. The switch sends the routed traffic to interfaces that are configured as user interfaces or are
connected to other devices.
When using EIGRP stub routing, you need to configure the distribution and remote routers to use EIGRP and to configure
only the switch as a stub. Only specified routes are propagated from the switch. The switch responds to all queries for
summaries, connected routes, and routing updates.
Note: EIGRP stub routing only advertises connected or summary routes from the routing tables to other switches in the
network. The switch uses EIGRP stub routing at the access layer to eliminate the need for other types of routing
advertisements. If you try to configure multi-VRF-CE and EIGRP stub routing at the same time, the configuration is not
allowed.
Any neighbor that receives a packet informing it of the stub status does not query the stub router for any routes, and a
router that has a stub peer does not query that peer. The stub router depends on the distribution router to send the proper
updates to all peers.
In Figure 100 on page 844, switch B is configured as an EIGRP stub router. Switches A and C are connected to the rest
of the WAN. Switch B advertises connected, static, redistribution, and summary routes to switch A and C. Switch B does
not advertise any routes learned from switch A (and the reverse).
Figure 100 EIGRP Stub Router Configuration
For more information about EIGRP stub routing, see IP Routing: EIGRP Configuration Guide, Cisco IOS Release 15M&T.
BEFORE YOU BEGIN
Complete the EIGRP network strategy and planning for your network.
Host A Host B
Switch B
Switch A
Routed to WAN
Switch C
Host C
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