In this lab, I am gonna teach you OSPF Multi-Area Configuration of 4 Routers
Table of Contents
VLSM
Given Network: 210.80.50.0
Required hosts on Router 1= 50
Required hosts on Router 2= 25
Required hosts on Router 3= 14
Required hosts on Router 4= 5
R1<= 50
50<= 2n – 2
50<= 26 – 2
50<= 64 – 2
50<= 62
Total number of network bits = 32
32 – n = 32 – 6 = 26 (CIDR value of given network i.e. Router 1)
i.e. 210.80.50.0/26
N.S.M = 11111111. 11111111. 11111111.11000000
= 255.255.255.192
Block Size = 256 – N.S.M
= 256 – 192 = 64
Note: Add this block size in given network so that we can get our new network for Router 2.
So the new network is 210.80.50.64/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 0 |
| First Valid Host-FVH | 210 | 80 | 50 | 1 |
| Last Valid Host-LVH | 210 | 80 | 50 | 62 |
| Broadcast | 210 | 80 | 50 | 63 |
| New Network | 210 | 80 | 50 | 64 |
R2<= 25
25<= 2n – 2
25<= 25 – 2
25<= 32 – 2
25<= 30
Total number of network bits = 32
32 – n = 32 – 5 = 27 (CIDR value of given network i.e. Router 2)
i.e. 210.80.50.64/27
N.S.M = 11111111. 11111111. 11111111.11100000
= 255.255.255.224
Block Size = 256 – N.S.M
= 256 – 224 = 32
Note: Add this block size in given network so that we can get our new network for Router 3.
So the new network is 210.80.50.96/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 64 |
| First Valid Host-FVH | 210 | 80 | 50 | 65 |
| Last Valid Host-LVH | 210 | 80 | 50 | 94 |
| Broadcast | 210 | 80 | 50 | 95 |
| New Network | 210 | 80 | 50 | 96 |
R3<= 14
14<= 2n – 2
14<= 24 – 2
14<= 16 – 2
14<= 14
Total number of network bits = 32
32 – n = 32 – 4 = 28 (CIDR value of given network i.e. Router 3)
i.e. 210.80.50.96/28
N.S.M = 11111111. 11111111. 11111111.11110000
= 255.255.255.240
Block Size = 256 – N.S.M
= 256 – 240 = 16
Note: Add this block size in given network so that we can get our new network for Router 4.
So the new network is 210.80.50.112/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 96 |
| First Valid Host-FVH | 210 | 80 | 50 | 97 |
| Last Valid Host-LVH | 210 | 80 | 50 | 110 |
| Broadcast | 210 | 80 | 50 | 111 |
| New Network | 210 | 80 | 50 | 112 |
R4 <= 5
5 <= 2n – 2
5 <= 23 – 2
5 <= 8 – 2
5 <= 6
Total number of network bits = 32
32 – n = 32 – 3 = 29 (CIDR of given network i.e. Router 4)
i.e. 210.80.50.112/29
N.S.M = 11111111.11111111.11111111.11111000
= 255.255.255.248
Block Size = 256 – N.S.M
= 256 – 248 = 8
Note: Add this block size in given network so that we can get our new network for Router 1 and 2 (Virtual Network).
so the new network is 210.80.50.120/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 112 |
| First Valid Host-FVH | 210 | 80 | 50 | 113 |
| Last Valid Host-LVH | 210 | 80 | 50 | 118 |
| Broadcast | 210 | 80 | 50 | 119 |
| New Network | 210 | 80 | 50 | 120 |
Router 1 & 2 <= 2 hosts (we required only two IP to connect 2 routers)
2 <= 2n – 2
2 <= 22 – 2
2 <= 4 – 2
2 <= 2
Total number of network bits = 32
32 – n = 32 – 2 = 30 (CIDR of Virtual network (R1&R2)
i.e. 210.80.50.120/30
N.S.M = 11111111.11111111.11111111.11111100
= 255.255.255.252
Block Size = 256 – N.S.M
= 256 – 252 = 4
Note: Add this block size in given network so that we can get our new network for Router 2 and 3 (Virtual Network).
so the new network is 210.80.50.124/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 120 |
| First Valid Host-FVH | 210 | 80 | 50 | 121 |
| Last Valid Host-LVH | 210 | 80 | 50 | 122 |
| Broadcast | 210 | 80 | 50 | 123 |
| New Network | 210 | 80 | 50 | 124 |
Router 2 & 3 <= 2 hosts (we required only two IP to connect 2 routers)
2 <= 2n – 2
2 <= 22 – 2
2 <= 4 – 2
2 <= 2
Total number of network bits = 32
32 – n = 32 – 2 = 30 (CIDR of Virtual network (R2&R3)
i.e. 210.80.50.124/30
N.S.M = 11111111.11111111.11111111.11111100
= 255.255.255.252
Block Size = 256 – N.S.M
= 256 – 252 = 4
Note: Add this block size in given network so that we can get our new network for Router 3 and 4 (Virtual Network).
so the new network is 210.80.50.128/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 124 |
| First Valid Host-FVH | 210 | 80 | 50 | 125 |
| Last Valid Host-LVH | 210 | 80 | 50 | 126 |
| Broadcast | 210 | 80 | 50 | 127 |
| New Network | 210 | 80 | 50 | 128 |
Router 3 & 4 <= 2 hosts (we required only two IP to connect 2 routers)
2 <= 2n – 2
2 <= 22 – 2
2 <= 4 – 2
2 <= 2
Total number of network bits = 32
32 – n = 32 – 2 = 30 (CIDR of Virtual network (R3&R4)
i.e. 210.80.50.128/30
N.S.M = 11111111.11111111.11111111.11111100
= 255.255.255.252
Block Size = 256 – N.S.M
= 256 – 252 = 4
Note: Add this block size in given network so that we can get our new network for Router 5. This network can be used in future.
so the new network is 210.80.50.132/?
Now find FVH, LVH and Broadcast address
| Given Network | 210 | 80 | 50 | 128 |
| First Valid Host-FVH | 210 | 80 | 50 | 129 |
| Last Valid Host-LVH | 210 | 80 | 50 | 130 |
| Broadcast | 210 | 80 | 50 | 131 |
| New Network | 210 | 80 | 50 | 132 |
Basic Configuration on Router 1
| Router>enable Router#configure terminal Router(config)#hostname R1 R1(config)#interface fastEthernet 0/0 R1(config-if)#ip address 210.80.50.1 255.255.255.192 R1(config-if)#no shutdown R1(config-if)#exit R1(config)#interface serial 0/0/0 R1(config-if)#ip address 210.80.50.121 255.255.255.252 R1(config-if)#clock rate 64000 R1(config-if)#no shutdown R1(config-if)#exit R1(config)#exit R1#write |
Basic Configuration on Router 2
| Router>enable Router#configure terminal Router(config)#hostname R2 R2(config)#interface fastEthernet 0/0 R2(config-if)#ip address 210.80.50.65 255.255.255.224 R2(config-if)#no shutdown R2(config-if)#exit R2(config)#interface serial 0/1/0 R2(config-if)#ip address 210.80.50.122 255.255.255.252 R2(config-if)#no shutdown R2(config-if)#exit R2(config)#interface serial 0/0/0 R2(config-if)#ip address 210.80.50.125 255.255.255.252 R2(config-if)#clock rate 64000 R2(config-if)#no shutdown R2(config-if)#exit R2(config)#exit R2#write |
Basic Configuration on Router 3
| Router>enable Router#configure terminal Router(config)#hostname R3 R3(config)#interface fastEthernet 0/0 R3(config-if)#ip address 210.80.50.93 255.255.255.240 R3(config-if)#no shutdown R3(config-if)#exit R3(config)#interface serial 0/1/0 R3(config-if)#ip address 210.80.50.126 255.255.255.252 R3(config-if)#no shutdown R3(config-if)#exit R3(config)#interface serial 0/0/0 R3(config-if)#ip address 210.80.50.129 255.255.255.252 R3(config-if)#clock rate 64000 R3(config-if)#no shutdown R3(config-if)#exit R3(config)#exit R3#write |
Basic Configuration on Router 4
| Router>enable Router#configure terminal Router(config)#hostname R4 R4(config)#interface fastEthernet 0/0 R4(config-if)#ip address 210.80.50.109 255.255.255.248 R4(config-if)#no shutdown R4(config-if)#exit R4(config)#interface serial 0/1/0 R4(config-if)#ip address 210.80.50.130 255.255.255.252 R4(config-if)#no shutdown R4(config-if)#exit R4(config)#exit R4#write |
OSPF Multi Area Configuration on Router 1
| R1>enable R1#configure terminal R1(config)#router ospf 30 R1(config-router)#network 210.80.50.1 0.0.0.0 area 1 R1(config-router)#network 210.80.50.121 0.0.0.0 area 1 R1(config-router)#exit R1(config)#exit R1#write |
OSPF Multi Area Configuration on Router 2
| R2>enable R2#configure terminal R2(config)#router ospf 30 R2(config-router)#network 210.80.50.65 0.0.0.0 area 1 R2(config-router)#network 210.80.50.122 0.0.0.0 area 1 R2(config-router)#network 210.80.50.125 0.0.0.0 area 0 R2(config-router)#exit R2(config)#exit R2#write |
OSPF Multi Area Configuration on Router 3
| R3>enable R3#configure terminal R3(config)#router ospf 30 R3(config-router)#network 210.80.50.126 0.0.0.0 area 0 R3(config-router)#network 210.80.50.97 0.0.0.0 area 2 R3(config-router)#network 210.80.50.129 0.0.0.0 area 2 R3(config-router)#exit R3(config)#exit R3#write |
OSPF Multi Area Configuration on Router 4
| R4>enable R4#configure terminal R4(config)#router ospf 30 R4(config-router)#network 210.80.50.113 0.0.0.0 area 2 R4(config-router)#network 210.80.50.130 0.0.0.0 area 2 R4(config-router)#exit R4(config)#exit R4#write |
Verification on Router 1
| R1#show ip route 210.80.50.0/24 is variably subnetted, 7 subnets, 5 masks C 210.80.50.0/26 is directly connected, FastEthernet0/0 O 210.80.50.64/27 [110/65] via 210.80.50.122, 00:02:23, Serial0/0/0 O IA 210.80.50.96/28 [110/129] via 210.80.50.122, 00:01:01, Serial0/0/0 O IA 210.80.50.112/29 [110/193] via 210.80.50.122, 00:00:02, Serial0/0/0 C 210.80.50.120/30 is directly connected, Serial0/0/0 O IA 210.80.50.124/30 [110/128] via 210.80.50.122, 00:02:13, Serial0/0/0 O IA 210.80.50.128/30 [110/192] via 210.80.50.122, 00:00:51, Serial0/0/0 |
Verification on Router 2
| R2#show ip route 210.80.50.0/24 is variably subnetted, 7 subnets, 5 masks O 210.80.50.0/26 [110/65] via 210.80.50.121, 00:02:36, Serial0/1/0 C 210.80.50.64/27 is directly connected, FastEthernet0/0 O IA 210.80.50.96/28 [110/65] via 210.80.50.126, 00:01:19, Serial0/0/0 O IA 210.80.50.112/29 [110/129] via 210.80.50.126, 00:00:20, Serial0/0/0 C 210.80.50.120/30 is directly connected, Serial0/1/0 C 210.80.50.124/30 is directly connected, Serial0/0/0 O IA 210.80.50.128/30 [110/128] via 210.80.50.126, 00:01:09, Serial0/0/0 |
Verification on Router 3
| R3#show ip route 210.80.50.0/24 is variably subnetted, 7 subnets, 5 masks O IA 210.80.50.0/26 [110/129] via 210.80.50.125, 00:01:51, Serial0/1/0 O IA 210.80.50.64/27 [110/65] via 210.80.50.125, 00:01:51, Serial0/1/0 C 210.80.50.96/28 is directly connected, FastEthernet0/0 O 210.80.50.112/29 [110/65] via 210.80.50.130, 00:00:38, Serial0/0/0 O IA 210.80.50.120/30 [110/128] via 210.80.50.125, 00:01:51, Serial0/1/0 C 210.80.50.124/30 is directly connected, Serial0/1/0 C 210.80.50.128/30 is directly connected, Serial0/0/01 |
Verification on Router 4
| R4#show ip route 210.80.50.0/24 is variably subnetted, 7 subnets, 5 masks O IA 210.80.50.0/26 [110/193] via 210.80.50.129, 00:00:52, Serial0/1/0 O IA 210.80.50.64/27 [110/129] via 210.80.50.129, 00:00:52, Serial0/1/0 O 210.80.50.96/28 [110/65] via 210.80.50.129, 00:00:52, Serial0/1/0 C 210.80.50.112/29 is directly connected, FastEthernet0/0 O IA 210.80.50.120/30 [110/192] via 210.80.50.129, 00:00:52, Serial0/1/0 O IA 210.80.50.124/30 [110/128] via 210.80.50.129, 00:00:52, Serial0/1/0 C 210.80.50.128/30 is directly connected, Serial0/1/0 |
