VLSM Asso.Prof. Dr.Anan Phonphoem Department of Computer Engineering,

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Presentation transcript:

VLSM Asso.Prof. Dr.Anan Phonphoem Department of Computer Engineering, Faculty of Engineering, Kasetsart University, Bangkok, Thailand

VLSM Variable-length subnet mask Classful allows only one subnet in a network > one subnet in an autonomous system Maximizing the use of address (Subnet Zero) “Subnetting a Subnet” Routing that support VLSM OSPF, Integrated IS-IS, EIGRP, RIPv2, and static routing

Subnet with VLSM 192.168.10.0/24

Regular Subnet 192.168.10.0/24 7 subnets; The largest subnet needs 60 hosts If 3 bits for subnet (8 subnets)  5 bits for host (32 hosts) If 6 bits for host (64 hosts)  2 bits for subnet (4 subnets)

Subnet with VLSM Select the biggest first 192.168.10.0/24 192.168.10.0/26 192.168.10.64/26 192.168.10.128/26 192.168.10.192/26 192.168.10.64/27 192.168.10.96/27 192.168.10.128/27 192.168.10.192/27 Perth KL

Subnet with VLSM 192.168.10.96/27 192.168.10.96/28 192.168.10.112/28 192.168.10.128/28 192.168.10.144/28 192.168.10.128/30 192.168.10.132/30 192.168.10.136/30 192.168.10.140/30 Sydney Singapore Perth – KL Sydney – KL Singapore – KL

Subnet with VLSM

Assignment 165.23.208.0/20 250 Stations 700 Stations 500 Stations CPE IE EE 700 Stations 500 Stations 100 Stations

Solution The largest subnet needs 700 hosts CPE IE EE 700 Stations 500 Stations 100 Stations 250 Stations Solution 165.23.208.0/20 165.23.208.0/22 165.23.212.0/22 165.23.216.0/22 165.23.220.0/22 1022 Hosts The largest subnet needs 700 hosts 10 bits for host (1024 hosts) 165.23.212.0/22 165.23.212.0/23 165.23.214.0/23 510 Hosts 165.23.214.0/23 165.23.214.0/24 165.23.215.0/24 254 Hosts 165.23.215.128/25 165.23.215.128/30 165.23.215.132/30 165.23.215.136/30 … 2 Hosts 165.23.215.0/24 165.23.215.0/25 165.23.215.128/25 126 Hosts

Solution 165.23.214.0/24 250 Stations 165.23.208.0/20 CPE 165.23.215.128/30 IE 165.23.215.132/30 EE 700 Stations 500 Stations 100 Stations 165.23.208.0/22 165.23.212.0/23 165.23.215.0/25

Route Aggregation Route summarization Supernetting Possible only if routers of a network use a classless routing protocol (OSPF or EIGRP) Carry 32-bit IP address and bit mask in the routing updates Share the same high-order bits