Variable Length Subnetting

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Presentation transcript:

Variable Length Subnetting Jim Blanco Aparicio-Levy Technical Center

Variable Length Subnetting VLSM allows us to use one class C address to design a networking scheme to meet the following requirements: Perth 60 users Kula Lumpur 28 users Sydney 12 users Singapore 12 users WAN links between each router

Networking Requirements Kula 60 WAN 2 WAN 2 WAN 2 Sydney 60 Sing. 60 Perth 60 Classful subnetting is very wasteful. In the example above, a /26 was used to provide the 60 addresses for Perth and the other LANs. There are no addresses left for WAN links

Forget everything you learned about classfull subnetting. VLSM Forget everything you learned about classfull subnetting. Just remember you have 256 – 2 = 254 addresses to work with.

List your network requirements in descending order. VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 Kula/28 Sydney/12 Sing/12 WAN1/2 WAN2/2 WAN3\2 List your network requirements in descending order.

Calculate the subnet mask to meet largest requirement - Perth VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 Sydney/12 Sing/12 WAN1/2 WAN2/2 WAN3\2 Calculate the subnet mask to meet largest requirement - Perth

VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 192.168.12.64 .65 - .94 .95 192.168.12.64\27 Sydney/12 Sing/12 WAN1/2 WAN2/2 WAN3\2 Keep track of subnet and broadcast addresses. Use the next available Address .64 to calculate a subnet mask for the next largest requirement - Kula Lumpur.

a subnet for Sydney’s requirement for 12 VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 192.168.12.64 .65 - .94 .95 192.168.12.64\27 Sydney/12 192.168.12.96 .97- .110 .111 192.168.12.96\28 Sing/12 WAN1/2 WAN2/2 WAN3\2 Sydney needs 12 addresses. Use the next available address .96 to calculate a subnet for Sydney’s requirement for 12

Singapore also requires 12 VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 192.168.12.64 .65 - .94 .95 192.168.12.64\27 Sydney/12 192.168.12.96 .97- .110 .111 192.168.12.96\28 Sing/12 192.168.12.112 .113 - .126 .127 192.168.12.112\28 WAN1/2 WAN2/2 WAN3\2 Singapore also requires 12

WAN links require 2 addresses each VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 192.168.12.64 .65 - .94 .95 192.168.12.64\27 Sydney/12 192.168.12.96 .97- .110 .111 192.168.12.96\28 Sing/12 192.168.12.112 .113 - .126 .127 192.168.12.112\28 WAN1/2 192.168.12.128 .129 - .130 .131 192.168.12.128\30 WAN2/2 WAN3\2 WAN links require 2 addresses each

VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 192.168.12.64 .65 - .94 .95 192.168.12.64\27 Sydney/12 192.168.12.96 .97- .110 .111 192.168.12.96\28 Sing/12 192.168.12.112 .113 - .126 .127 192.168.12.112\28 WAN1/2 192.168.12.128 .129 - .130 .131 192.168.12.128\30 WAN2/2 192.168.12.132 .133 - 134 .135 192.168.12.132\30 WAN3\2

The networking problem is solved VLSM Name/required addresses Subnet address Address range Broadcast Address\subnet Perth/60 192.168.12.0 .1 - 62 .63 192.168.12.0\26 Kula/28 192.168.12.64 .65 - .94 .95 192.168.12.64\27 Sydney/12 192.168.12.96 .97- .110 .111 192.168.12.96\28 Sing/12 192.168.12.112 .113 - .126 .127 192.168.12.112\28 WAN1/2 192.168.12.128 .129 - .130 .131 192.168.12.128\30 WAN2/2 192.168.12.132 .133 - 134 .135 192.168.12.132\30 WAN3\2 192.168.12.136 .137 - .138 .139 192.168.12.136\30 The networking problem is solved

Networking Scheme Kula 192.168.10.64/27 Sydney 192.168.10.96/28 WAN 192.198.10.133 and 134 WAN 192.198.10.129 and 130 WAN 192.198.10.137 and 138 Sydney 192.168.10.96/28 Sing. 192.168.10.112/28 Perth 192.168.10.0/26 Apply the address to the LAN or WAN link

VLSM A class C address such as 192.168.12.0 contains 256 - 2 = 254 usable addresses You used only addresses .0 - .139