Configuring Eigrp Stub Routing - Cisco Catalyst 4500 series Administration Manual

Chapter 34 Configuring Layer 3 Interfaces
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Configuring EIGRP Stub Routing

This section consists of the following subsections:
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About EIGRP Stub Routing
The EIGRP stub routing feature, available in all images, reduces resource utilization by moving routed
traffic closer to the end user.
The IP base image contains only EIGRP stub routing. The IP services image contains complete EIGRP
routing.
In a network using EIGRP stub routing, the only route for IP traffic to follow 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 switches 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.
Any neighbor that receives a packet informing it of the stub status does not query the stub switch for any
routes, and a switch that has a stub peer does not query that peer. The stub switch depends on the
distribution switch to send the proper updates to all peers.
In Figure
rest of the WAN. Switch B advertises connected, static, redistribution, and summary routes from switch
A and C to Hosts A, B, and C. Switch B does not advertise any routes learned from switch A (and the
reverse).
OL_28731-01
About EIGRP Stub Routing, page 34-13
Configuring EIGRP Stub Routing, page 34-14
Monitoring and Maintaining EIGRP, page 34-19
EIGRP Configuration Examples, page 34-19
34-3, switch B is configured as an EIGRP stub switch. Switches A and C are connected to the
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
Configuring EIGRP Stub Routing
34-13