EIGRP Manual Route Symmarization

Config EIGRP Route Summary

1.In the EIGRP router configurstion mode ,use no auto-summary command.
2.In the interface configuration mode , use the command:
  ip summary-address eigrp [as number] [network prefix] [network mask]
3.Verify the R2 Router have learning the summary network route!


=========================
Before enable EIGRP manual summary
=========================


R2#sh 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

     172.16.0.0/24 is subnetted, 4 subnets
D       172.16.4.0 [90/156160] via 192.168.2.2, 00:17:47, FastEthernet0/0
D       172.16.1.0 [90/156160] via 192.168.2.2, 00:17:47, FastEthernet0/0
D       172.16.2.0 [90/156160] via 192.168.2.2, 00:17:47, FastEthernet0/0
D       172.16.3.0 [90/156160] via 192.168.2.2, 00:17:47, FastEthernet0/0
     10.0.0.0/24 is subnetted, 4 subnets
D       10.1.3.0 [90/156160] via 192.168.1.2, 00:00:18, FastEthernet0/1
D       10.1.2.0 [90/156160] via 192.168.1.2, 00:00:18, FastEthernet0/1
D       10.1.1.0 [90/156160] via 192.168.1.2, 00:00:18, FastEthernet0/1
D       10.1.4.0 [90/156160] via 192.168.1.2, 00:00:18, FastEthernet0/1
C    192.168.1.0/24 is directly connected, FastEthernet0/1
C    192.168.2.0/24 is directly connected, FastEthernet0/0
R2#
R2#


=========================
After enable EIGRP manual summary
=========================

R2#
R2#sh 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    172.16.0.0/16 [90/156160] via 192.168.2.2, 00:00:12, FastEthernet0/0
     10.0.0.0/16 is subnetted, 1 subnets
D       10.1.0.0 [90/156160] via 192.168.1.2, 00:14:37, FastEthernet0/1
C    192.168.1.0/24 is directly connected, FastEthernet0/1
C    192.168.2.0/24 is directly connected, FastEthernet0/0
R2#
R2#








R1#
=============================
interface Loopback0
 ip address 10.1.1.1 255.255.255.0
!
interface Loopback1
 ip address 10.1.2.2 255.255.255.0
!
interface Loopback3
 ip address 10.1.3.3 255.255.255.0
!
interface Loopback4
 ip address 10.1.4.4 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 192.168.1.2 255.255.255.0
 ip summary-address eigrp 10 10.1.0.0 255.255.0.0 5
 duplex auto
 speed auto
!
router eigrp 10
 network 10.1.1.0 0.0.0.255
 network 10.1.2.0 0.0.0.255
 network 10.1.3.0 0.0.0.255
 network 10.1.4.0 0.0.0.255
 network 192.168.1.0
 no auto-summary
!

=============================


R2#
=============================
interface FastEthernet0/0
 ip address 192.168.2.1 255.255.255.0
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 192.168.1.1 255.255.255.0
 duplex auto
 speed auto
!
router eigrp 10
 network 192.168.1.0
 network 192.168.2.0
 no auto-summary
=============================




R3#
=============================
interface Loopback0
 ip address 172.16.1.1 255.255.255.0
!
interface Loopback1
 ip address 172.16.2.2 255.255.255.0
!
interface Loopback2
 ip address 172.16.3.3 255.255.255.0
!
interface Loopback3
 ip address 172.16.4.4 255.255.255.0
!
interface FastEthernet0/0
 ip address 192.168.2.2 255.255.255.0
 ip summary-address eigrp 10 172.16.0.0 255.255.0.0 5
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
router eigrp 10
 network 172.16.1.0 0.0.0.255
 network 172.16.2.0 0.0.0.255
 network 172.16.3.0 0.0.0.255
 network 172.16.4.0 0.0.0.255
 network 192.168.2.0
 no auto-summary
 =============================