- Logical segmentation/Partitioning exchangers
- Traffic can only be passed to the terminal equipment of the same VLAN
- Absolutely no traffic can pass to another VLAN
- Best practice is to use a unique subnet for each VLAN (network)
How does VLAN work?
When a frame enters a switch, it will be tagged with a vlan information.
Creating VLANs
- from the privileged mode to create a VLAN
- Exchanger #VLAN database
- Switch (VLAN) #VLAN 2
- Switch (VLAN) #exit
Creating VLAN from Global Configuration
Switch(config)#vlan 2
Assigning Ports to a VLAN:
Switch(config)#interface fastethernet 0/1
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 2
Note: you can also assign a port to create a VLAN VLAN has not been created.
Note: VLAN information stored in VLAN.dat located in Flash memory.
VLAN Creation Guidelines:
- Maximum number of Vlan is switch dependent.
- Most of the Cisco Catalyst desktop switch supports 128 separate spanning-tree instances, one for each VLAN.
- VLAN Ethernet VLAN 1 is the factory default values.
- Cisco Discovery Protocol and VTP advertisements are sent on VLAN 1.
- Cisco Catalyst Switch IP address is in the management VLAN (VLAN 1, default).
VLAN Membership Modes:
Verifying the VLANs Created:
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
Fa0/21, Fa0/22, Fa0/23, Fa0/24
2 VLAN0002 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
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