A VLAN is a separate broadcast domain inside one physical switch. Access ports belong to one VLAN and carry untagged traffic for the connected host. This chapter teaches access-port configuration and verification.
By default every port on a switch belongs to VLAN 1. A broadcast frame received on any port floods to every other port. VLANs let you split that single broadcast domain into many — Sales in VLAN 10, Engineering in VLAN 20, Voice in VLAN 100 — even though they share the same physical switch.
Hosts in different VLANs cannot reach each other directly. Inter-VLAN traffic must pass through a router (or an L3 switch with SVIs).
Switch> enable
Switch# configure terminal
Switch(config)# vlan 10
Switch(config-vlan)# name SALES
Switch(config-vlan)# exit
Switch(config)# interface Fa0/1
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan 10
Switch(config-if)# end
Switch# show vlan brief2 more sections in this chapter, plus a 2-question quiz.
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