To fix the issue, the vlans have to be configured on S1 to match what is configured on S2 and S3. Pings were unsuccessful because VLANs 10, 20, and 30 were not configured on S1. Compare the outputs from the ‘ show interface trunk ’ on all switches.) Why was the ping unsuccessful? (Hint: Look at the ‘ show vlan brief ’ output from all three switches. You should be able ping one switch from another switch in the topology using the IP addresses configured on the SVI.
Verify trunking is successfully configured on all the switches. On S2 and S3, configure VLAN 999 as the native VLAN. To correct native VLAN mismatch, configure VLAN 999 as the native VLAN on S2 and S3. %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/1 (999), with S2 GigabitEthernet0/1 (1). %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/2 (999), with S3 GigabitEthernet0/2 (1). What messages did you receive on S1? How would you correct it? S1(config-if- range)# switchport trunk native vlan 999 Question: Configure VLAN 999 as the native VLAN for the trunk links on S1. What is the native VLAN for these trunks currently? Port Vlans in spanning tree forwarding state and not pruned Port Vlans allowed and active in management domain Port Mode Encapsulation Status Native vlan Verify trunking is enabled on all the switches using the show interfaces trunk command. Sending DTP Hello packets every 30 seconds Use the show dtp command to verify the status of DTP. In addition, disable DTP negotiation on interface G0/2 on S1. For the trunk link between S1 and S3, configure interface GigabitEthernet 0/2 as a static trunk link on S1. The switchport is in auto mode, which is the default. What is the mode and status for this port? Interface GigabitEthernet 0/1 should appear in the output. On switch S2, verify that the trunk has been negotiated by entering the show interfaces trunk command. The trunk will be successfully negotiated because the port on S2 is in the default dynamic auto mode. What will be the result of trunk negotiation between S1 and S2? S1(config- if)# switchport mode dynamic desirable Question: On switch S1, configure the trunk link to dynamic desirable on the GigabitEthernet 0/1 interface. Use VLAN 999 as the native VLAN in this topology. The link between switches S1 and S3 will be set as a static trunk. In this step, you will change the trunking mode to dynamic desirable for the link between switches S1 and S2. Currently, all the switchports are in the default trunking mode, which is dynamic auto. Part 4: Configure Trunks on S1, S2, and S3.ĭynamic trunking protocol (DTP) manages the trunk links between Cisco switches. According to the show vlan brief output, ports G0/1 and G0/2 are still access port members of VLAN1. This is because the ports that connect the switches are not configured as trunks to carry traffic from multiple VLANs. 
Now that you have the ports assigned to VLANs, try to ping from PC1 to PC6. Assign VLANs to ports on S3 using the assignments from the table above.S2(config-if- range)# switchport access vlan 30 S2(config-if- range)# interface range f0/17 – 24 S2(config-if- range)# switchport access vlan 20 S2(config-if- range)# interface range f0/9 -16 S2(config-if- range)# switchport access vlan 10 S2(config-if- range)# switchport mode access Assign VLANs to ports on S2 using assignments from the table above.Create VLANs 20 and 30 according to the table below.
Part 2: Create additional VLANs on S2 and S3. VLANs 99 and 999 are configured on all the switches. What VLANs are configured on the switches?
On S1, go to privileged EXEC mode and enter the show vlan brief command to verify the VLANs that are present.ġ default active Fa0/1, Fa0/2, Fa0/3, Fa0/4. Verify the configured VLANs on the switches. Instructions Part 1: Verify VLAN configuration. You will configure trunk links between the switches, and you will configure VLAN 999 as the native VLAN. 
You will assign ports to VLANs and verify end-to-end connectivity between hosts in the same VLAN. In this activity, you will configure trunk links between the switches. To ease some of the VLAN and trunking configurations, trunk negotiation between network devices is managed by the Dynamic Trunking Protocol (DTP), and is automatically enabled on Catalyst 2960 and Catalyst 3650 switches. As the number of switches in a network increases, the administration necessary to manage the VLANs and trunks can be challenging.
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