2.6.2 Packet Tracer – Configuring a Default Route Answers

2.6.2 Packet Tracer – Configuring a Default Route Answers

Topology

Introduction:

In this activity we will examine ways of making routing tables shorter. We will look at summarizing static routes to contiguous networks into a single route that includes all of the routes. We will also look at replacing a number of individual static routes with a static default route that will match any packet that does not have a specific entry in the routing table.

Learning Objectives:

• Examine the network with individual static routes to all networks.
• View the configuration.
• Verify connectivity.
• Summarize static routes to contiguous networks.
• Replace existing static routes with a summary static route.
• View the configuration.
• Verify connectivity.
• Configure a stub network.
• Replace existing static routes with a default static route.
• View the configuration.
• Verify connectivity.

Task 1: Examine the network with individual static routes to all networks.

Step 1 – View the configuration.

On each of the three routers:

• Login to the router using password cisco. Enter privileged exec mode using password class.
• Enter the command show running-config to see how static routing is currently configured.
• Enter the command show ip route to see the effect of the configuration. There are individual static routes on each router to every remote network.

Step 2 – Verify connectivity.

From the command line prompt on each of the three PCs, ping the other two PCs. All pings should succeed.

Task 2: Summarize static routes to contiguous networks.

Step 1 – Replace existing static routes with a summary static route.

On router R3 enter global configuration mode and enter the following commands:

• R3(config)#no ip route 172.16.1.0 255.255.255.0 s0/0/1
• R3(config)#no ip route 172.16.2.0 255.255.255.0 s0/0/1
• R3(config)#no ip route 172.16.3.0 255.255.255.0 s0/0/1
• R3(config)#ip route 172.16.0.0 255.255.252.0 s0/0/1

Step 2 – Save the updated configurations.

On router R3, exit configuration mode by using the Ctrl+z key sequence. Save the configuration by issuing the command copy run start.

Step 3 – View the configuration.

On router R3:

• Enter the command show running-config to see how static routing is now configured.
• Enter the command show ip route to see the effect of the changed configuration. There is only one static route to every remote network.

Step 4 – Verify connectivity.

From the command line prompt on PC3, ping the other two PCs. All pings should succeed, if not troubleshoot the static route.

Task 3: Configure a stub network.

Step 1 – Replace existing static routes with a default static route.

On router R1 enter global configuration mode and enter the following commands:

• R1(config)# no ip route 172.16.1.0 255.255.255.0 s0/0/0
• R1(config)# no ip route 192.168.1.0 255.255.255.0 s0/0/0
• R1(config)# no ip route 192.168.2.0 255.255.255.0 s0/0/0
• R1(config)# ip route 0.0.0.0 0.0.0.0 s0/0/0

Step 2 – Save the updated configurations.

On router R1, exit configuration mode by using the Ctrl+z key sequence. Save the configuration by issuing the command copy run start.

Step 3 – View the configuration.

On router R1:

• Enter the command show running-config to see how static routing is now configured.
• Enter the command show ip route to see the effect of the changed configuration. There is a single default route to every remote network.

Step 4 – Verify connectivity.

From the command line prompt on PC1, ping the other two PCs. All pings should succeed, if not troubleshoot the static default route.

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