Packet Tracer 6.4.1.5 – Configuring IPv4 Route Summarization – Scenario 1 – CCNA 2 – Chapter 6

September 13, 2020 Alice AUSTIN

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.
172.22.1.128: 10101100.00010110.00000001.10000000
172.22.1.160: 10101100.00010110.00000001.10100000
c. Copy the matching bits and fill in the remaining bits with zeros to determine the summarized network address.
10101100.00010110.00000001.10000000
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.
10101100.00011111.10011101.00000000
10101100.00011111.10011101.01000000
10101100.00011111.10011101.01100000
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.