Question

1) How to Create VLAN on Cisco Catalyst Switch #show vlan а. VLAN Name Status Ports 1 default active Gil/0/1, Gil/0/2, Gil/0/3, Gil/0/4 Gil/0/5, Gil/0/6, Gil/0/7, Gil/0/8 config t Interface vlan 20 b. interface range gigabitEthernet 0/1 - 6 switchport access vlan 20 exit c. #show vlan VLAN Name Status Ports 1 default Gil/0/1, Gil/0/2, Gil/0/7, Gil/0/8 Gil/0/3, Gil/0/4, Gil/0/5, Gil/0/6 active active 20 VLAN020 2. How to Delete VLAN on Cisco Catalyst Switch no vlan 20 a. b. show vlan VLAN Name Status Ports default active Gil/0/1, Gil/0/2, Gil/0/3, Gil/0/4 Gil/0/5, Gil/0/6, Gil/0/7, Gil/0/8 1 3. Configure the trunk interfaces Switch A switchA(config)#interface gigabit 0/24 switchA(config-if)#switchport trunk encapsulation dotlq This command specifies the protocol that the two switches will use to communicate vlan information in the data that is transfered rather than leaving it to auto-negotiate. Two Cisco switches will negotiate to ISL (Interswitch Switch Link) protocol which is Cisco proprietary rather than 802.1x, a recognized standard that is compatible with almost all switches and servers. switchA(config-if)#switchport trunk native vlan 20 The native vlan command specifies the vlan that will be transmitted without VLAN tag information. It does not mtter which vlan is used, but both switches must agree for the link to operate properly. If a native vlan is not specified, then the switches will use vlan 1 by default Using vlan 1 can cause problems because it is used as the default for so many other things in a switch network switchA(config-if)#switchport trunk allowed vlan 5,20 The allowed vlan command specifies which VLAN8 will be allowed to communicte over the trunk link. Otherwise, unnecessary traffic may go over the link. Switch B switchB(config)#interface gigbbit 0/22 switchB(config-if)#switchport trunk encapsulation dotlq switchB(config-if)#switchport trunk native vlan 20 switchB(config-if)#switchport trunk allowed vlan 5,20 NOTE: If VLAN 15 was configured on the switches, then it would need to be added to the trunk port on each switch Switch A switchA(config)#interface gigbbit 0/1 switchA(config-if)#switchport trunk allowed vlan add 15 Switch B switchB(config)#interface gigbbit 0/1 switchB(config-if)#switchport trunk allowed vlan add 15 A VLAN can be removed with a similar command:

Answer 1

1.

Please find the following steps to create a VLAN in Cisco Catalyst Switches.

Vlan: It is abbreviated as "Virtual Local Area Network."

In a cisco catalyst switch, you can create many VLANs that links to different local area network.

For example, VLAN 11 is for 10.10.191.0 network, and a VLAN 23 for 10.10.192.0 network, and so on . All these vlan can be configured in the same catalyst switch.

Step 1: Following show command shows default vlan config

Cisco#show vlan

VLAN Name Status Ports
---- -------------------------------- --------- ------------
1 default active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4
Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8

Step 2: Configuring a VLAN 200 in cisco catalyst siwtch

In this example, ports 3 through 6 are configured as part of 192 VLAN network.

Cisco#config term
vlan 200
interface range gigabitEthernet 1/0/3-6
switchport access vlan 200
exit
Step 3: Verify the configured vlan in show vlan command

Cisco#show vlan

VLAN Name Status Ports
---- -------------------------------- --------- ------------
1 default active Gi1/0/1, Gi1/0/2, Gi1/0/7, Gi1/0/8
192 VLAN0192 active Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6
Step 4: Additional info. to delete a vlan, please follow the steps given below.

a. First assign the ports 3 to 6 to vlan 1 from vlan 200 before deleting vlan 200.

interface range gigabitEThernet 1/0/3-6
switchport access vlan 1
exit
b. Next, delete the vlan itself as shown below.

no vlan 200

2.