Cisco Systems 3750E manual Eigrp Stub Routing, 38-42

Chapter 38 Configuring IP Unicast Routing

Configuring EIGRP

	Command	Purpose
Step 9
	accept-lifetime start-time{infinite end-time duration	(Optional) Specify the time period during which the key
	seconds}	can be received.
		The start-timeand end-timesyntax can be either
		hh:mm:ss Month date year or hh:mm:ss date Month
		year. The default is forever with the default start-time
		and the earliest acceptable date as January 1, 1993. The
		default end-timeand duration is infinite.
Step 10
	send-lifetime start-time{infinite end-time duration	(Optional) Specify the time period during which the key
	seconds}	can be sent.
		The start-timeand end-timesyntax can be either
		hh:mm:ss Month date year or hh:mm:ss date Month
		year. The default is forever with the default start-time
		and the earliest acceptable date as January 1, 1993. The
		default end-timeand duration is infinite.
Step 11
	end	Return to privileged EXEC mode.
Step 12
	show key chain	Display authentication key information.
Step 13
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Use the no forms of these commands to disable the feature or to return the setting to the default value.

EIGRP Stub Routing

The EIGRP stub routing feature, available in all feature sets, reduces resource utilization by moving routed traffic closer to the end user.

Note The IP base feature set contains only EIGRP stub routing. The IP services feature set contains complete EIGRP routing.

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.

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 38-4, 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).

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
38-42	OL-9775-02