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Advanced Routing
Lesson 4 – Subnetting, VLSM and Route Summarization

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Lesson Content

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Classful Network Addressing
Classful Subnet Masks
Classful Addressing Waste
Classless Inter-Domain Routing
CIDR and Route Summarization
Static Routing CIDR Example
Fixed Length Subnet Masking
Variable Length Subnet Masking
VLSM in Action
VLSM Example
Route Summarization
Calculate a Summary Route
Summary Static Route Example
Summarize IPv6 Network Addresses
Configure an IPv6 Summary Address

Classful Network Addressing

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Classful Subnet Masks
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Classful Addressing Waste

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Classless Inter-Domain Routing
CIDR reduces the size of the
routing table via:
Route Summarization
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CIDR and Route Summarization
Step 1
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Step 2
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This identifies the prefix
length or subnet mask for
the summarized route
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Copy the matching
bits and then add zero bits
to the rest of the address
to determine the
summarized network
address
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• VLSM is simply subnetting a subnet
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• Individual host addresses are assigned from the addresses of "subsubnets"
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• CIDR ignores the limitation of classful boundaries, and allows
summarization with masks that are smaller than that of the default
classful mask
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Calculate a Summary Route

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Summary Static Route Example

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Summarize IPv6 Network
Addresses
• Aside from the fact that IPv6 addresses are 128 bits long and written
in hexadecimal, summarizing IPv6 addresses is actually similar to the
summarization of IPv4 addresses
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• Multiple static IPv6 routes can be summarized into a single static
IPv6 route if:
• The destination networks are contiguous and can be summarized
into a single network address
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Summarize IPv6 Network
Addresses (Cont…)
There are seven steps to summarize IPv6 networks into a single IPv6
prefix:
Step 1
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Step 2
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Step 3
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Step 4
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Step 5
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Step 6
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Step 7
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Configure an IPv6 Summary
Address

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End of Lesson 4

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