Variable Length Subnet Mask(VLSM) 可變長度子網路切割王振生. Variable Length Subnetting...

Variable Length Subnet Mask(VLSM)可變長度子網路切割

王振生

Variable Length Subnetting

‣ VLSM allows us to use one class C address to design a networking scheme to meet the following requirements:

‣ Taipei 60 users‣ Kaohsiung 28 users‣ Taichung 12 users‣ Tainan 12 users‣ WAN links between each router

Networking Requirements

Taipei 60 users

Taichung 12 users Tainan 12 users Kaohsiung 28 users

WAN 1WAN 2

•If a /26 was used to provide 60 addresses for LANs. There are no addresses left for WAN links•Classful subnetting is very wasteful.

VLSM Design Scheme

Name/requiredaddresses

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0

Kaohsiung/28

Taichung/12

Tainan/12

WAN1/2

WAN2/2

WAN3/2

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0

.1 - 62 .63 192.168.12.0/26

Kaohsiung/28

Taichung/12

Tainan/12

WAN1/2

WAN2/2

WAN3/2

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26

Kaohsiung/28

192.168.12.64

.65 - .94 .95 192.168.12.64/27

Taichung/12

Tainan/12

WAN1/2

WAN2/2

WAN3/2

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26

Kaohsiung/28

192.168.12.64

.65 - .94 .95 192.168.12.64/27

Taichung/12 192.168.12.96

.97- .110 .111 192.168.12.96/28

Tainan/12

WAN1/2

WAN2/2

WAN3/2

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26

Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27

Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28

Tainan/12 192.168.12.112

.113 - .126 .127 192.168.12.112/28

WAN1/2

WAN2/2

WAN3/2

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26

Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27

Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28

Tainan/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

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26

Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27

Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28

Tainan/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

VLSM Design Scheme

Subnet address

Address range

Broadcast

Address/subnet

Taipei/60 192.168.12.0 .1 - .62 .63 192.168.12.0/26

Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27

Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28

Tainan/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

Networking Scheme

Taipei/3620192.168.12.0/26

Taichung/1721192.168.12.96/28

Tainan/1721192.168.12.112/28

Kaohsiung/1721192.168.12.64/27

WAN 1 192.168.12.128/30

S1/0 .129

S1/.130

S1/2 .133

S1/1 .137WAN 2

192.168.12.132/30

WAN 3 192.168.12.136/30

S1/.138

F0/.65F0/.113F0/.97

E0/0 .1

S1/.134

Variable Length Subnet Mask(VLSM) 可變長度子網路切割王振生. Variable Length Subnetting...

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