# Four area topology Topology taken from [this image](https://networklessons.com/wp-content/uploads/2017/05/xis-is-multiple-areas-adjacencies.png.pagespeed.a.ic.tmdDcRdRK8.png) ``` ------ ------ ------ | | | | | | | R5 1|------|3 R6 1|------|2 R9 1|--- h9_1 | 2 | | 2 | | | ------ ------ ------ | | | | | | ------ ------ | 1 | | 1 | | R7 2|------|3 R8 | | | | 2 | ------ ------ | | | ------ ------ ------ ------ | | | 1 | | | | | | R1 1|------|3 R2 2|------|3 R3 1|------|1 R4 | | | | | | 2 | | | ------ ------ ------ ------ | | | h3_1 ``` ## R1 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.1/32 1 | R1-eth1 | 10.0.1.1/24 ## R2 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.2/32 1 | R2-eth1 | 10.0.2.1/24 2 | R2-eth2 | 10.0.3.1/24 3 | R2-eth3 | 10.0.1.2/24 ## R3 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.3/32 1 | R3-eth1 | 10.0.4.1/24 2 | R3-eth2 | 10.3.0.254/24 3 | R3-eth3 | 10.0.3.2/24 ## R4 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.4/32 1 | R4-eth1 | 10.0.4.2/24 ## R5 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.5/32 1 | R5-eth1 | 10.0.5.1/24 2 | R5-eth2 | 10.0.6.1/24 ## R6 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.6/32 1 | R6-eth1 | 10.0.6.1/24 2 | R6-eth2 | 10.0.7.1/24 3 | R6-eth3 | 10.0.5.2/24 ## R7 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.7/32 1 | R7-eth1 | 10.0.6.2/24 2 | R7-eth2 | 10.0.8.1/24 ## R8 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.8/32 1 | R8-eth1 | 10.0.7.2/24 2 | R8-eth2 | 10.0.2.2/24 3 | R8-eth3 | 10.0.8.2/24 ## R9 Interface | Name | Address/Subnet ----------|---------|--------------- 0 | lo | 10.0.0.9/32 1 | R9-eth1 | 10.9.0.254/24 2 | R9-eth2 | 10.0.6.2/24 ## h3_1 Interface | Name | Address/Subnet ----------|-----------|--------------- 1 | h3_1-eth1 | 10.3.0.1/24 ## h9_1 Interface | Name | Address/Subnet ----------|-----------|--------------- 1 | h9_1-eth1 | 10.9.0.1/24