R1#
interface Loopback1
ip address 10.0.0.1 255.255.255.255
!
interface Loopback2
ip address 10.0.0.2 255.255.255.255
!
interface Loopback3
ip address 10.0.0.3 255.255.255.255
!
interface Loopback4
ip address 10.0.0.4 255.255.255.255
!
interface Loopback5
ip address 10.0.0.5 255.255.255.255
!
interface Loopback6
ip address 10.0.0.6 255.255.255.255
!
router rip
version 2
network 10.0.0.0
network 12.0.0.0
no auto-summary
R2#
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 23.23.23.2 255.255.255.0
!
interface Serial0/0
ip address 12.12.12.2 255.255.255.0
!
router rip
version 2
network 2.0.0.0
network 12.0.0.0
network 23.0.0.0
no auto-summary
R3#
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 23.23.23.3 255.255.255.0
!
router rip
version 2
network 3.0.0.0
network 23.0.0.0
no auto-summary
Let's check the routing table
R2(config-router)#do sh ip rou rip
3.0.0.0/32 is subnetted, 1 subnets
R 3.3.3.3 [120/1] via 23.23.23.3, 00:00:05, FastEthernet0/0
10.0.0.0/32 is subnetted, 6 subnets
R 10.0.0.2 [120/1] via 12.12.12.1, 00:00:01, Serial0/0
R 10.0.0.3 [120/1] via 12.12.12.1, 00:00:01, Serial0/0
R 10.0.0.1 [120/1] via 12.12.12.1, 00:00:01, Serial0/0
R 10.0.0.6 [120/1] via 12.12.12.1, 00:00:01, Serial0/0
R 10.0.0.4 [120/1] via 12.12.12.1, 00:00:01, Serial0/0
R 10.0.0.5 [120/1] via 12.12.12.1, 00:00:01, Serial0/0
R3#sh ip rou rip
2.0.0.0/32 is subnetted, 1 subnets
R 2.2.2.2 [120/1] via 23.23.23.2, 00:00:07, FastEthernet0/0
10.0.0.0/32 is subnetted, 6 subnets
R 10.0.0.2 [120/2] via 23.23.23.2, 00:00:07, FastEthernet0/0
R 10.0.0.3 [120/2] via 23.23.23.2, 00:00:07, FastEthernet0/0
R 10.0.0.1 [120/2] via 23.23.23.2, 00:00:07, FastEthernet0/0
R 10.0.0.6 [120/2] via 23.23.23.2, 00:00:07, FastEthernet0/0
R 10.0.0.4 [120/2] via 23.23.23.2, 00:00:07, FastEthernet0/0
R 10.0.0.5 [120/2] via 23.23.23.2, 00:00:07, FastEthernet0/0
12.0.0.0/24 is subnetted, 1 subnets
R 12.12.12.0 [120/1] via 23.23.23.2, 00:00:07, FastEthernet0/0
Then we will do filtering in router R2 that only even IP loopback advertized by R1.
R2(config-router)#distribute 1 in s0/0
R2(config-router)#ex
R2(config)#access 1 permit 0.0.0.0 255.255.255.254
Let's check the routing table again
R2(config)#do clear ip rout *
R2(config)#do sh ip rou rip
3.0.0.0/32 is subnetted, 1 subnets
R 3.3.3.3 [120/1] via 23.23.23.3, 00:00:04, FastEthernet0/0
10.0.0.0/32 is subnetted, 3 subnets
R 10.0.0.2 [120/1] via 12.12.12.1, 00:00:02, Serial0/0
R 10.0.0.6 [120/1] via 12.12.12.1, 00:00:02, Serial0/0
R 10.0.0.4 [120/1] via 12.12.12.1, 00:00:02, Serial0/0
R3#clear ip rout *
R3#sh ip rou rip
2.0.0.0/32 is subnetted, 1 subnets
R 2.2.2.2 [120/1] via 23.23.23.2, 00:00:00, FastEthernet0/0
10.0.0.0/32 is subnetted, 3 subnets
R 10.0.0.2 [120/2] via 23.23.23.2, 00:00:00, FastEthernet0/0
R 10.0.0.6 [120/2] via 23.23.23.2, 00:00:00, FastEthernet0/0
R 10.0.0.4 [120/2] via 23.23.23.2, 00:00:00, FastEthernet0/0
12.0.0.0/24 is subnetted, 1 subnets
R 12.12.12.0 [120/1] via 23.23.23.2, 00:00:00, FastEthernet0/0
Now, we only want odd IP loopback in R2.
R2(config)#no access 1 permit 0.0.0.0 255.255.255.254
R2(config)#access 1 permit 0.0.0.1 255.255.255.254
Let's check again the routing table
R2(config)#do clear ip rou *
R2(config)#do sh ip rou rip
3.0.0.0/32 is subnetted, 1 subnets
R 3.3.3.3 [120/1] via 23.23.23.3, 00:00:04, FastEthernet0/0
10.0.0.0/32 is subnetted, 3 subnets
R 10.0.0.3 [120/1] via 12.12.12.1, 00:00:04, Serial0/0
R 10.0.0.1 [120/1] via 12.12.12.1, 00:00:04, Serial0/0
R 10.0.0.5 [120/1] via 12.12.12.1, 00:00:04, Serial0/0
R3#clear ip rout *
R3#sh ip rou rip
2.0.0.0/32 is subnetted, 1 subnets
R 2.2.2.2 [120/1] via 23.23.23.2, 00:00:03, FastEthernet0/0
10.0.0.0/32 is subnetted, 3 subnets
R 10.0.0.3 [120/2] via 23.23.23.2, 00:00:03, FastEthernet0/0
R 10.0.0.1 [120/2] via 23.23.23.2, 00:00:03, FastEthernet0/0
R 10.0.0.5 [120/2] via 23.23.23.2, 00:00:03, FastEthernet0/0
12.0.0.0/24 is subnetted, 1 subnets
R 12.12.12.0 [120/1] via 23.23.23.2, 00:00:03, FastEthernet0/0
No comments:
Post a Comment