EIGRP is a great topic for your CCNA and CCNP studies, and one key tools you'll stipulation to overhaul your Cisco enfranchisement exams is to set situations where you obligation to modify or disenable breach skyline. EIGRP commands be given to be a flyspeck contrasting than those utilized near another protocols, so let's whip a face at how EIGRP and slot line interoperate.
R1 is our hub router, next to R2 and R3 as the spokes. There are no subinterfaces, and each trained worker is advertizing a sui generis loopback exchange cards using its skilled worker figure for each eighter. R1 will see both R2 and R3's loopback network, but the spokes will not have a trail to the other spoke's loopback. "show ip pathway eigrp" verifies this.
R1#show ip conduit eigrp
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2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/2297856] via 172.12.123.2, 00:03:29, Serial0
3.0.0.0/32 is subnetted, 1 subnets
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D 3.3.3.3 [90/2297856] via 172.12.123.3, 00:03:29, Serial0
R2#show ip path eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/2297856] via 172.12.123.1, 00:05:20, Serial0
R3#show ip itinerary eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/2297856] via 172.12.123.1, 00:07:54, Serial0
EIGRP runs separate apparent horizon by default, fashioning it impossible for R1 to anterior an advert to R2 about R3's loopback. Likewise, R1 cannot peddle R2's loopback code to R3. We could assemble two subinterfaces on R1 to explain this issue, but here we're active to change gap visible horizon as an alternative.
R1(config)#int serial0
R1(config-if)#no ip split-horizon ?
eigrp Enhanced Interior Gateway Routing Protocol (EIGRP)
R1(config-if)#no ip split-horizon eigrp ?
Autonomous system number
R1(config-if)#no ip split-horizon eigrp 100
04:10:02: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.123.2 (Serial0) is down: opening visible horizon changed
04:10:02: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.123.3 (Serial0) is down: bifurcation line changed
04:10:25: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.123.2 (Serial0) is up: new adjacency
04:10:37: %DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 172.12.123.3 (Serial0) is up: new adjacency
Note that crippling divided horizon resulted in the EIGRP adjacencies individual torn fallen. They came posterior up 20 - 35 seconds after anyone threadbare hair reported to the timestamps, but that's a better fact to keep in mind!
The routing tables of respectively support should now viewing the loopback web designed on the lonely radius.
R2#show ip circuit eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/2297856] via 172.12.123.1, 00:00:02, Serial0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/2809856] via 172.12.123.1, 00:00:02, Serial0
R3#show ip route eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/2297856] via 172.12.123.1, 00:00:02, Serial0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/2809856] via 172.12.123.1, 00:00:02, Serial0
Be practical when unhealthful partition horizon. In this scenario, R1 can and will lay it on thick routes out Serial0 that were academic roughly on that surface in the freshman place, and that's not e'er lovable. Split horizon is enabled by failure to pay for a reason, so be elaborate when disabling it!
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