GNS3 can't ping loopback with EIGRP

[Mary]

I have roter R2 and R3 connected by EIGRP through Fa0/1

R2:

interface Loopback0
ip address 150.1.2.2 255.255.255.0
!
interface FastEthernet0/0
no ip address
ip helper-address 150.1.3.3
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 155.1.23.2 255.255.255.0
duplex auto
speed auto
!
router eigrp 1
network 150.1.0.0
network 0.0.0.0
auto-summary

R3:

interface Loopback0
ip address 150.1.3.3 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 155.1.23.3 255.255.255.0
duplex auto
speed auto
!
router eigrp 1
network 0.0.0.0
auto-summary
!

+++++++++++++++++

show ip route

155.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 155.1.23.0/24 is directly connected, FastEthernet0/1
D 155.1.0.0/16 is a summary, 00:06:04, Null0
150.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 150.1.3.0/24 is directly connected, Loopback0
D 150.1.0.0/16 is a summary, 00:05:54, Null0

how to adjust config so I can ping 150.1.2.2 from R3 Loopback 150.1.3.3, thanks

[johnd2310]

Hi

Why do you have auto-summary under the eigrp configuration? Can you remove the auto-summary on all routers and do a show ip route.

router eigrp 1
  no auto-summary

   Thanks

John

[Mary]

why we can't use auto-summary?

[johnd2310]

Hi,

Because with your current configuration not all the routes will be exchanged/installed in the routing tables.

R2:
interface Loopback0
ip address 150.1.2.2 255.255.255.0

R3:
interface Loopback0
ip address 150.1.3.3 255.255.255.0

are part of the same summary network 150.1.0.0/16.

thanks

John150.1.3.3