On S2 and S3, issue the show interface trunk command to confirm that DTP has successfully negotiated trunking with S1 on S2 and S3. In this case, S2 and S3 have now automatically configured the ports attached to S1 as trunking ports. Dynamic Trunking Protocol (DTP) has automatically negotiated the other side of the trunk links. Pings are successful because trunking has been enabled on S1. However, the S2 and S3 are using VLAN 1 as the default native VLAN as indicated by the syslog message.Īlthough you have a native VLAN mismatch, pings between PCs on the same VLAN are now successful. You configured VLAN 99 as the native VLAN on S1. %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet1/1 (99), with S2 GigabitEthernet1/1 (1). %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet1/2 (99), with S3 GigabitEthernet1/2 (1). After the ports become active, you will periodically receive the following syslog messages: Click Fast Forward Time to speed the process. The trunk port takes about a minute to become active due to Spanning Tree which you will learn in the proceeding chapters.
S1(config-if-range)#switchport trunk native vlan 99 Configure VLAN 99 as the native VLAN for G1/1 and G1/2 interfaces on S1.
S1(config-if-range)#switchport mode trunkī. Configure G1/1 and G1/2 interfaces on S1 for trunking. Part 2: Configure Trunks Step 1: Configure trunking on S1 and use VLAN 99 as the native VLAN.Ī. In order to provide connectivity between the PCs on the same network and VLAN, trunks must be configured. This is because the ports connecting the switches are assigned to VLAN 1 by default. Step 2: Verify loss of connectivity between PCs on the same network.Īlthough PC1 and PC4 are on the same network, they cannot ping one another. On S2 and S3, display and verify all the VLANs are configure and assigned to the correct switchports according to the Addressing Table. Notice how all 26 ports on the switch are assigned to one port or another.ī. On S1, issue the command that will display all VLANs configured. Part 1: Verify VLANs Step 1: Display the current VLANs.Ī. This activity focuses on creating trunk ports, and assigning them to a native VLAN other than the default. A trunk port by default is a member of all VLANs therefore, it carries traffic for all VLANs. Access ports carry traffic from a specific VLAN assigned to the port. A port on a switch is either an access port or a trunk port. Trunks are required to pass VLAN information between switches. Packet Tracer – Configuring Trunks Addressing Table
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