VERIFY
Thursday, December 25, 2008
#MODULE 3 EIGRP : SPLIT HORIZON THU DEC 25#
SPLIT HORIZON IN EIGRP:
1.To enable EIGRP split horizon, use ip split-horizon eigrp as-no
2. For networks that include x.25 and psn PACKET SWITCHED NETWORKS,you can use neighbor router configuration
to defeat split horizon
3. As an alternative, you can explicitly specify the "no ip split-horizon eigrp" command in the config
CODE
r1#show ip int s0/0 | i Split
Split horizon is disabled
r5#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
D 1.0.0.0/8 [90/2195456] via 10.0.0.1, 00:46:06, Serial0/0
D 4.0.0.0/8 [90/2707456] via 10.0.0.1, 00:41:54, Serial0/0
C 5.0.0.0/8 is directly connected, FastEthernet0/0
C 10.0.0.0/8 is directly connected, Serial0/0
r5#ping 4.0.0.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.0.0.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/20/28 ms
r5#ping 1.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/15/24 ms
r5#
Split horizon is disabled
r5#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
D 1.0.0.0/8 [90/2195456] via 10.0.0.1, 00:46:06, Serial0/0
D 4.0.0.0/8 [90/2707456] via 10.0.0.1, 00:41:54, Serial0/0
C 5.0.0.0/8 is directly connected, FastEthernet0/0
C 10.0.0.0/8 is directly connected, Serial0/0
r5#ping 4.0.0.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.0.0.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/20/28 ms
r5#ping 1.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/15/24 ms
r5#