UMN:CLI User ManualV5812G2108.1.1 Port-based VLANThe simplest implicit mapping rule is known as port-based VLAN. A frame is assigned to aVLAN based solely on the switch port on which the frame arrives. In the exampledepicted in Fig. 8.1, frames arriving on ports 1 through 4 are assigned to VLAN 1, framefrom ports 5 through 8 are assigned to VLAN 2, and frames from ports 9 through 12 areassigned to VLAN 3.Stations within a given VLAN can freely communicate among themselves using eitherunicast or multicast addressing. No communication is possible at the Data Link layer be-tween stations connected to ports that are members of different VLANs. Communicationamong devices in separate VLANs can be accomplished at higher layers of the architec-ture, for example, by using a Network layer router with connections to two or more VLANs.Multicast traffic, or traffic destined for an unknown unicast address arriving on any port,will be flooded only to those ports that are part of the same VLAN. This provides thedesired traffic isolation and bandwidth preservation. The use of port-based VLANseffectively partitions a single switch into multiple sub-switches, one for each VLAN.Fig. 8.1 Port-based VLANThe IEEE 802.1Q based ports on the switches support simultaneous tagged anduntagged traffic. An 802.1Q port is assigned a default port VLAN ID (PVID), and alluntagged traffic is assumed to belong to the port default PVID. Thus, the portsparticipating in the VLANs accept packets bearing VLAN tags and transmit them to theport VLAN ID.The below functions are explained.• Creating VLAN• Specifying PVID• Adding Port to VLAN• Deleting VLAN
