san1#show run
!
interface FastEthernet0/0
 ip address 192.168.1.1 255.255.255.0
 duplex half
!
interface Serial1/1
 ip address 192.168.64.1 255.255.255.252
 serial restart-delay 0
!
router eigrp 100
 network 192.168.1.0
 network 192.168.64.0
 auto-summary
!    
end

west#show run
!
interface Loopback0
 ip address 172.16.8.1 255.255.255.0
!
interface Loopback1
 ip address 172.16.9.1 255.255.255.0
!
interface Loopback2
 ip address 172.16.10.1 255.255.255.0
!
interface Loopback3
 ip address 172.16.11.1 255.255.255.0
!
interface Loopback4
 ip address 172.16.12.1 255.255.255.0
!
interface Loopback5
 ip address 172.16.13.1 255.255.255.0
!
interface Loopback6
 ip address 172.16.14.1 255.255.255.0
!
interface Loopback7
 ip address 172.16.15.1 255.255.255.0
!
interface Serial1/0
 ip address 192.168.64.2 255.255.255.252
 ip summary-address eigrp 100 172.16.8.0 255.255.248.0 5
 serial restart-delay 0
!
interface Serial1/1
 ip address 192.168.64.6 255.255.255.252
 ip summary-address eigrp 100 172.16.8.0 255.255.248.0 5
 serial restart-delay 0
!
router eigrp 100
 network 172.16.0.0
 network 192.168.64.0
 network 192.168.72.0
 no auto-summary
!
west#

san2#show run
!
!
interface FastEthernet0/0
 ip address 192.168.1.2 255.255.255.0
 duplex half
!
interface Serial1/0
 ip address 192.168.64.5 255.255.255.252
 serial restart-delay 0
!
router eigrp 100
 network 192.168.1.0
 network 192.168.64.0
 auto-summary
!
     
west(config-if)#int s1/0
west(config-if)#ip summary-address eigrp 100 172.16.8.0 255.255.248.0
west(config-if)#int s1/1
west(config-if)#ip summary-address eigrp 100 172.16.8.0 255.255.248.0

west#show ip protocols
Routing Protocol is "eigrp 100"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Redistributing: eigrp 100
  EIGRP NSF-aware route hold timer is 240s
  Automatic network summarization is not in effect
  Address Summarization:
    172.16.8.0/21 for Serial1/1, Serial1/0
      Summarizing with metric 128256
  Maximum path: 4
  Routing for Networks:
    172.16.0.0
    192.168.64.0
    192.168.72.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    (this router)         90      00:00:57
    192.168.64.1          90      00:00:57
    192.168.64.5          90      00:00:59
  Distance: internal 90 external 170