Auto-Summary

As far now we have the reachability

Now lets create a loop back on R6 with an ip address of 111.10.10.10 and publish it in the EIGRP domain

Now lets check the reach ability.

R6#sh run

router eigrp 100

 network 111.0.0.0

 network 155.1.156.6 0.0.0.0

 network 155.6.6.6 0.0.0.0

 auto-summary

R6#sh run

interface Loopback10

 ip address 111.10.10.10 255.255.255.0

End

!

R2#ping 111.10.10.10

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 111.10.10.10, timeout is 2 seconds:

U.U.U

Success rate is 0 percent (0/5)

R6#ping 111.10.10.10

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 111.10.10.10, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms

Amazed lets check the reachability from R2 and BB1

BB1#ping 110.10.10.10

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 110.10.10.10, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

CONCLUSION:

This problem because of the DISCONTINUOS network

To Avoid this Problem disable the auto-summary