9.3.3 Packet Tracer - HSRP Configuration Guide

Packet Tracer - HSRP Configuration Guide Addressing Table Device Interface IP Address Default Gateway R1 G0/0 10.1.1.1/30 N/A R1 G0/1 192.168.1.1/24 N/A R1 G0/2 10.1.1.9/30 N/A R2 G0/0 10.1.1.2/30 N/A R2 G0/1 10.1.1.5/30 N/A R2 G0/2 10.100.100.1/30 N/A R3 G0/0 192.168.1.3/24 N/A R3 G0/1 10.1.1.6/30 N/A R3 G0/2 10.1.1.10/30 N/A I-Net G0/1 10.100.100.2/30 N/A HSRP Virtual Gateway Virtual 192.168.1.254/24 N/A S1 VLAN 1 192.168.1.11/24 192.168.1.1 S3 VLAN 1 192.168.1.13/24 192.168.1.3 PC-A NIC 192.168.1.101/24 192.168.1.1 PC-B NIC 192.168.1.103/24 192.168.1.3 Web Server NIC 209.165.200.226/27 209.165.100.225 Note: The I-Net router is present in the internet cloud and cannot be accessed in this activity. Objectives In this Packet Tracer activity, you will learn how to configure Hot Standby Router Protocol (HSRP) to provide redundant default gateway devices to hosts on LANs. After configuring HSRP, you will test the configuration to verify that hosts are able to use the redundant default gateway if the current gateway device becomes unavailable.  Configure an HSRP active router.  Configure an HSRP standby router.  Verify HSRP operation. Background / Scenario Spanning Tree Protocol provides loop-free redundancy between switches within a LAN. However, it does not provide redundant default gateways for end-user devices within the network if a gateway router fails. First Hop Redundancy Protocols (FHRPs) provide redundant default gateways for end devices with no additional end-user configuration necessary. By using a FHRP, two or more routers can share the same virtual IP  2019 - 2019 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 1 of 6 www.netacad.com

Packet Tracer - HSRP Configuration Guide address and MAC address and can act as a single virtual router. Hosts on the network are configured with a shared IP address as their default gateway. In this Packet Tracer activity, you will configure Cisco’s Hot Standby Router Protocol (HSRP), which is an FHRP. You will configure HSRP on routers R1 and R3, which serve as the default gateways for the hosts on LAN 1 and LAN 2. When you configure HSRP, you will create a virtual gateway that uses the same default gateway address for hosts in both LANs. If one gateway router becomes unavailable, the second router will take over using the same default gateway address that was used by the first router. Because the hosts on the LANs are configured with the IP address of the virtual gateway as the default gateway, the hosts will regain connectivity to remote networks after HSRP activates the remaining router. Instructions Part 1: Verify Connectivity Step 1: Trace the path to the Web Server from PC-A. a. Go to the desktop of PC-A and open a command prompt. b. Trace the path from PC-A to the webserver by executing the tracert 209.165.200.226 command. Question: Which devices are on the path from PC-A to the Web Server? Use the addressing table to determine the device names. R1, R2, I-net Type your answers here. Step 2: Trace the path to the Web Server from PC-B. Repeat the process in Step 1 from PC-B. Question: Which devices are on the path from PC-B to the Web Server? r3, r2, i-net Type your answers here. Step 3: Observe the network behavior when R3 becomes unavailable. a. Select the delete tool from the Packet Tracer tool bar and delete the link between R3 and S3 . b. Open a command prompt on PC-B. Execute the tracert command with the Web Server as the destination. c. Compare the current output with the output of the command from Step 2. Question: What are the results? the path no longer exists. Type your answers here. d. Click the Connections icon in the lower left corner of the PT window. Locate and select the Copper Straight-Through icon in the pallet of connection types. e. Click on S3 and select port GigbitEthernet0/2 . Click R3 and select port GigabitEthernet0/0 . f. After the link lights on the connection are both green, test the connection by pinging the Web Server. The ping should be successful.  2019 - 2019 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 2 of 6 www.netacad.com

Packet Tracer - HSRP Configuration Guide Virtual IP address is 192.168.1.254 Active virtual MAC address is 0000.0C9F.F001 Local virtual MAC address is 0000.0C9F.F001 (v2 default) Hello time 3 sec, hold time 10 sec Next hello sent in 1.696 secs Preemption enabled Active router is local Standby router is 192.168.1.3 Priority 150 (configured 150) Group name is "hsrp-Gi0/1-1" (default) R3# show standby GigabitEthernet0/0 - Group 1 (version 2) State is Standby 4 state changes, last state change 00:02:29 Virtual IP address is 192.168.1.254 Active virtual MAC address is 0000.0C9F.F001 Local virtual MAC address is 0000.0C9F.F001 (v2 default) Hello time 3 sec, hold time 10 sec Next hello sent in 0.720 secs Preemption disabled Active router is 192.168.1.1 MAC address is d48c.b5ce.a0c1 Standby router is local Priority 100 (default 100) Group name is "hsrp-Gi0/0-1" (default) Using the output shown above, answer the following questions: Questions: Which router is the active router? r1 Type your answers here. What is the MAC address for the virtual IP address? 0000.0c9f.f001 Type your answers here. What is the IP address and priority of the standby router? 100, 192.168.1.3 Type your answers here. b. Use the show standby brief command on R1 and R3 to view an HSRP status summary. Sample output is shown below. R1# show standby brief P indicates configured to preempt. | Interface Grp Pri P State Active Standby Virtual IP Gi0/1 1 150 P Active local 192.168.1.3 192.168.1.254 R3# show standby brief P indicates configured to preempt.  2019 - 2019 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 4 of 6 www.netacad.com

Packet Tracer - HSRP Configuration Guide | Interface Grp Pri P State Active Standby Virtual IP Gi0/0 1 100 Standby 192.168.1.1 local 192.168.1.254 c. Change the default gateway address for PC-A, PC-C, S1, and S3. Questions: Which address should you use? 192.168.1.254 Type your answers here. Verify the new settings. Issue a ping from both PC-A and PC-C to the Web Server. Are the pings successful? yes Type your answers here. Close configuration window Part 3: Observe HSRP Operation Step 1: Make the active router become unavailable. Open a command prompt on PC-B and enter the command tracert 209.165.200.226 . Question: Does the path differ from the path used before HSRP was configured? yes. Type your answers here. Step 2: Break the link to R1. a. Select the delete tool from the Packet Tracer toolbar and delete the cable that connects R1 to S1. b. Immediately return to PC-B and execute the tracert 209.165.200.226 command again. Observe the output of the command until the command completes execution. You may need to repeat the trace to see the full path. Question: How was this trace different from the previous trace? it timed out, then went r3 instead of r1. Type your answers here. HSRP undergoes a process to determine which router should take over when the active router becomes unavailable. This process takes time. Once the process is complete, the R3 standby router becomes active and is used as the default gateway for hosts on LAN 1 and LAN 2. Step 3: Restore the link to R1. a. Re-connect R1 to S1 with a copper straight-through cable. b. Execute a trace from PC-B to the Web Server. You may need to repeat the trace to see the full path. Questions: What path is used to reach the Web Server? R1 Type your answers here. If the preempt command was not configured for the HSRP group on R1, would the results have been the same? No, it would have used r3 still.  2019 - 2019 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 5 of 6 www.netacad.com