RIP v2 question 4

 ip summary-address rip Vs no auto-summary in RIP ?

R1(config-if)#do sh ip int brief

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0          172.16.0.1      YES NVRAM  up                    up

Loopback0                  10.1.17.1       YES NVRAM  up                    up

Loopback1                  10.1.18.1       YES NVRAM  up                    up

Loopback2                  10.1.19.1       YES NVRAM  up                    up

Loopback3                  10.1.20.1       YES NVRAM  up                    up

Loopback4                  10.1.21.1       YES NVRAM  up                    up

Loopback5                  10.1.22.1       YES NVRAM  up                    up

Loopback6                  10.1.23.1       YES NVRAM  up                    up

Loopback7                  10.1.24.1       YES NVRAM  up                    up

Loopback8                  10.1.25.1       YES NVRAM  up                    up

RIP auto-summary

R1(config-if)#do sh run | s rip

router rip

 version 2

 network 10.0.0.0

 network 172.16.0.0

R2#sh ip route | b Gate

Gateway of last resort is not set

C    172.16.0.0/16 is directly connected, FastEthernet0/0

R    10.0.0.0/8 [120/1] via 172.16.0.1, 00:00:24, FastEthernet0/0

After no auto-summary

R1#sh run | s rip

router rip

 version 2

 network 10.0.0.0

 network 172.16.0.0

 no auto-summary

R2#sh ip route | b Gate

Gateway of last resort is not set

C    172.16.0.0/16 is directly connected, FastEthernet0/0

     10.0.0.0/8 is variably subnetted, 10 subnets, 2 masks

R       10.0.0.0/8     [120/1] via 172.16.0.1, 00:01:14, FastEthernet0/0

R       10.1.25.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.24.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.19.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.18.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.17.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.23.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.22.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.21.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

R       10.1.20.0/24 [120/1] via 172.16.0.1, 00:00:21, FastEthernet0/0

After manual summary

R1(config-router)#interface FastEthernet0/0

R1(config-router)#ip address 172.16.0.1 255.255.0.0

R1(config-router)# ip summary-address rip 10.1.16.0 255.255.248.0

R2#sh ip route | b Gate

Gateway of last resort is not set

C 172.16.0.0/16 is directly connected, FastEthernet0/0

10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks

R 10.1.25.0/24 [120/1] via 172.16.0.1, 00:00:13, FastEthernet0/0

R 10.1.24.0/24 [120/1] via 172.16.0.1, 00:00:13, FastEthernet0/0

R 10.1.16.0/21 [120/1] via 172.16.0.1, 00:00:13, FastEthernet0/0