Posted: May 31st, 2023

Configuring 802.1Q Trunk-Based Inter-VLAN Routing Topology

Lab – Configuring 802.1Q Trunk-Based Inter-VLAN RoutingTopology© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 1 of 7Lab – Configuring 802.1Q Trunk-Based Inter-VLAN RoutingAddressing TableDeviceR1InterfaceIP AddressSubnet MaskDefault GatewayG0/1.1192.168.1.1255.255.255.0N/AG0/1.10192.168.10.1255.255.255.0N/AG0/1.20192.168.20.1255.255.255.0N/ALo0209.165.200.225255.255.255.224N/AS1VLAN 1192.168.1.11255.255.255.0192.168.1.1S2VLAN 1192.168.1.12255.255.255.0192.168.1.1PC-ANIC192.168.10.3255.255.255.0192.168.10.1PC-BNIC192.168.20.3255.255.255.0192.168.20.1Switch Port Assignment SpecificationsPortsAssignmentNetworkS1 F0/1802.1Q TrunkN/AS2 F0/1802.1Q TrunkN/AS1 F0/5802.1Q TrunkN/AS1 F0/6VLAN 10 – Students192.168.10.0/24S2 F0/18VLAN 20 – Faculty192.168.20.0/24ObjectivesPart 1: Build the Network and Configure Basic Device SettingsPart 2: Configure Switches with VLANs and TrunkingPart 3: Configure Trunk-Based Inter-VLAN RoutingBackground / ScenarioA second method of providing routing and connectivity for multiple VLANs is through the use of an 802.1Qtrunk between one or more switches and a single router interface. This method is also known as router-on-astick inter-VLAN routing. In this method, the physical router interface is divided into multiple subinterfaces thatprovide logical pathways to all VLANs connected.In this lab, you will configure trunk-based inter-VLAN routing and verify connectivity to hosts on differentVLANs as well as with a loopback on the router.Note: This lab provides minimal assistance with the actual commands necessary to configure trunk-basedinter-VLAN routing. However, the required configuration commands are provided in Appendix A of this lab.Test your knowledge by trying to configure the devices without referring to the appendix.Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) withCisco IOS, Release 15.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with CiscoIOS, Release 15.0(2) (lanbasek9 image). Other routers, switches and Cisco IOS versions can be used.Depending on the model and Cisco IOS version, the commands available and output produced might vary© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 2 of 7Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routingfrom what is shown in the labs. Refer to the Router Interface Summary Table at the end of the lab for thecorrect interface identifiers.Note: Make sure that the routers and switches have been erased and have no startup configurations. If youare unsure, contact your instructor.Required Resources1 Router (Cisco 1941 with Cisco IOS, release 15.2(4)M3 universal image or comparable)2 Switches (Cisco 2960 with Cisco IOS, release 15.0(2) lanbasek9 image or comparable)2 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)Console cables to configure the Cisco IOS devices via the console portsEthernet cables as shown in the topologyPart 1: Build the Network and Configure Basic Device SettingsIn Part 1, you will set up the network topology and configure basic settings on the PC hosts, switches, androuter.Step 1: Cable the network as shown in the topology.Step 2: Configure PC hosts.Step 3: Initialize and reload the router and switches as necessary.Step 4: Configure basic settings for each switch.a. Disable DNS lookup.b. Configure device names as shown in the topology.c.Assign class as the privileged EXEC password.d. Assign cisco as the console and vty passwords.e. Configure logging synchronous for the console line.f.Configure the IP address listed in the Addressing Table for VLAN 1 on both switches.g. Configure the default gateway on both switches.h. Administratively deactivate all unused ports on the switch.i.Copy the running configuration to the startup configuration.Step 5: Configure basic settings for the router.a. Disable DNS lookup.b. Configure device names as shown in the topology.c.Configure the Lo0 IP address as shown in the Address Table. Do not configure subinterfaces at this timeas they will be configured in Part 3.d. Assign cisco as the console and vty passwords.e. Assign class as the privileged EXEC password.f.Configure logging synchronous to prevent console messages from interrupting command entry.© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 3 of 7Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routingg. Copy the running configuration to the startup configuration.Part 2: Configure Switches with VLANs and TrunkingIn Part 2, you will configure the switches with VLANs and trunking.Note: The required commands for Part 2 are provided in Appendix A. Test your knowledge by trying toconfigure S1 and S2 without referring to the appendix.Step 1: Configure VLANs on S1.a. On S1, configure the VLANs and names listed in the Switch Port Assignment Specifications table. Writethe commands you used in the space provided.S1:vlan 10S1:name StudentsS1:interface vlan 10S1:ip address 192.168.10.0 255.255.0.0b. On S1, configure the interface connected to R1 as a trunk. Also configure the interface connected to S2as a trunk. Write the commands you used in the space provided.S1:interface f0/1S1:switchport mode trunkS1:interface f0/5S1:switchport mode trunkc.On S1, assign the access port for PC-A to VLAN 10. Write the commands you used in the spaceprovided.S1:interface f0/6S1:switchport access vlan 10Step 2: Configure VLANs on Switch 2.a. On S2, configure the VLANs and names listed in the Switch Port Assignment Specifications table.b. On S2, verify that the VLAN names and numbers match those on S1. Write the command you used in thespace provided.show vlan briefc.On S2, assign the access port for PC-B to VLAN 20.d. On S2, configure the interface connected to S1 as a trunk.Part 3: Configure Trunk-Based Inter-VLAN RoutingIn Part 3, you will configure R1 to route to multiple VLANs by creating subinterfaces for each VLAN. Thismethod of inter-VLAN routing is called router-on-a-stick.Note: The required commands for Part 3 are provided in Appendix A. Test your knowledge by trying toconfigure trunk-based or router-on-a-stick inter-VLAN routing without referring to the appendix.© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 4 of 7Lab – Configuring 802.1Q Trunk-Based Inter-VLAN RoutingStep 1: Configure a subinterface for VLAN 1.a. Create a subinterface on R1 G0/1 for VLAN 1 using 1 as the subinterface ID. Write the command youused in the space provided.interface g0/1.1b. Configure the subinterface to operate on VLAN 1. Write the command you used in the space provided.encapsulation dot1Q 1c.Configure the subinterface with the IP address from the Address Table. Write the command you used inthe space provided.ip address 192.168.1.1 255.255.255.0Step 2: Configure a subinterface for VLAN 10.a. Create a subinterface on R1 G0/1 for VLAN 10 using 10 as the subinterface ID.b. Configure the subinterface to operate on VLAN 10.c.Configure the subinterface with the address from the Address Table.Step 3: Configure a subinterface for VLAN 20.a. Create a subinterface on R1 G0/1 for VLAN 20 using 20 as the subinterface ID.b. Configure the subinterface to operate on VLAN 20.c.Configure the subinterface with the address from the Address Table.Step 4: Enable the G0/1 interface.Enable the G0/1 interface. Write the commands you used in the space provided.interface g0/1no shutdownStep 5: Verify connectivity.Enter the command to view the routing table on R1. What networks are listed?show ip routeFrom PC-A, is it possible to ping the default gateway for VLAN 10? NoFrom PC-A, is it possible to ping PC-B? NoFrom PC-A, is it possible to ping Lo0 YesFrom PC-A, is it possible to ping S2? NoIf the answer is no to any of these questions, troubleshoot the configurations and correct any errors.ReflectionWhat are the advantages of trunk-based or router-on-a-stick inter-VLAN routing?© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 5 of 7Lab – Configuring 802.1Q Trunk-Based Inter-VLAN RoutingRouter Interface Summary TableRouter Interface SummaryRouter ModelEthernet Interface #1Ethernet Interface #2Serial Interface #1Serial Interface #21800Fast Ethernet 0/0(F0/0)Fast Ethernet 0/1(F0/1)Serial 0/0/0 (S0/0/0)Serial 0/0/1 (S0/0/1)1900Gigabit Ethernet 0/0(G0/0)Gigabit Ethernet 0/1(G0/1)Serial 0/0/0 (S0/0/0)Serial 0/0/1 (S0/0/1)2801Fast Ethernet 0/0(F0/0)Fast Ethernet 0/1(F0/1)Serial 0/1/0 (S0/1/0)Serial 0/1/1 (S0/1/1)2811Fast Ethernet 0/0(F0/0)Fast Ethernet 0/1(F0/1)Serial 0/0/0 (S0/0/0)Serial 0/0/1 (S0/0/1)2900Gigabit Ethernet 0/0(G0/0)Gigabit Ethernet 0/1(G0/1)Serial 0/0/0 (S0/0/0)Serial 0/0/1 (S0/0/1)Note: To find out how the router is configured, look at the interfaces to identify the type of router and how manyinterfaces the router has. There is no way to effectively list all the combinations of configurations for each routerclass. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.The table does not include any other type of interface, even though a specific router may contain one. Anexample of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can beused in Cisco IOS commands to represent the interface.Appendix A – Configuration CommandsSwitch S1S1(config)# vlan 10S1(config-vlan)# name StudentsS1(config-vlan)# vlan 20S1(config-vlan)# name FacultyS1(config-vlan)# exitS1(config)# interface f0/1S1(config-if)# switchport mode trunkS1(config-if)# interface f0/5S1(config-if)# switchport mode trunkS1(config-if)# interface f0/6S1(config-if)# switchport mode accessS1(config-if)# switchport access vlan 10Switch S2S2(config)# vlan 10S2(config-vlan)# name StudentsS2(config-vlan)# vlan 20S2(config-vlan)# name FacultyS2(config)# interface f0/1S2(config-if)# switchport mode trunk© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 6 of 7Lab – Configuring 802.1Q Trunk-Based Inter-VLAN RoutingS2(config-if)# interface f0/18S2(config-if)# switchport mode accessS2(config-if)# switchport access vlan 20Router R1R1(config)# interface g0/1.1R1(config-subif)# encapsulation dot1Q 1R1(config-subif)# ip address 192.168.1.1 255.255.255.0R1(config-subif)# interface g0/1.10R1(config-subif)# encapsulation dot1Q 10R1(config-subif)# ip address 192.168.10.1 255.255.255.0R1(config-subif)# interface g0/1.20R1(config-subif)# encapsulation dot1Q 20R1(config-subif)# ip address 192.168.20.1 255.255.255.0R1(config-subif)# exitR1(config)# interface g0/1R1(config-if)# no shutdown© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.Page 7 of 7

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