6.4.1.5 Packet Tracer – Configuring IPv4 Route Summarization – Scenario 1 Instructions Answers

Packet Tracer – Configuring IPv4 Route Summarization – Scenario 1

6.4.1.5 Packet Tracer - Configuring IPv4 Route Summarization - Scenario 1 Instructions Answers 6

Addressing Table

6.4.1.5 Packet Tracer - Configuring IPv4 Route Summarization - Scenario 1 Instructions Answers 7

Objectives

Part 1: Calculate Summary Routes
Part 2: Configure Summary Routes
Part 3: Verify Connectivity

Background

In this activity, you will calculate and configure summary routes. Router summarization, also known as route aggregation, is the process of advertising a contiguous set of addresses as a single address.

Part 1: Calculate Summary Routes

Step 1: Calculate a summary route on R1 to reach LANs on R3.
a. List the 172.22.1.128/27 and 172.22.1.160/27 networks in binary format.

172.22.1.128: 10101100.00010110.00000001.10000000
172.22.1.160: 10101100.00010110.00000001.10100000

b. Count the left-most matching bits to determine the mask for the summary route. They have 26 left-most bits in common.
6.4.1.5 Packet Tracer - Configuring IPv4 Route Summarization - Scenario 1 Instructions Answers 8
c. Copy the matching bits and fill in the remaining bits with zeros to determine the summarized network address.
6.4.1.5 Packet Tracer - Configuring IPv4 Route Summarization - Scenario 1 Instructions Answers 9
d. What is the summarized network address and subnet mask? 172.22.1.128 ; 255.255.255.192
Step 2: Calculate a summary route on R3 to reach LANs on R1 and R2.
a. Calculate the summary route for the 172.31.157.0/26, 172.31.157.64/27, and 172.31.157.96/30 networks. List the networks in binary format. Then, count the left-most matching bits to determine the mask for the summary route.
6.4.1.5 Packet Tracer - Configuring IPv4 Route Summarization - Scenario 1 Instructions Answers 10
b. What is the summarized network address and subnet mask? 172.31.157.0 ; 255.255.255.128

Part 2: Configure Summary Routes

Step 1: Configure a summary route for R1.
Configure the recursive summary route that you calculated in Part 1, Step 1.

R1(config)#ip route 172.22.1.128 255.255.255.192 172.31.157.98

Step 2: Configure a summary route for R3.
Configure the directly attached summary route that you calculated in Part 1, Step 2.

R3(config)#ip route 172.31.157.0 255.255.255.128 serial 0/0/1

Part 3: Verify Connectivity

Verify that all PC hosts and routers can ping other PC hosts and routers in the topology. If not, troubleshoot and correct the issues.



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