564 Configuring VLANsTable 21-1 provides an overview of the types of VLANs you can use tologically divide the network.Switchport ModesYou can configure each port on a PowerConnectM6220/M6348/M8024/M8024-k switch to be in one of the following modes:• Access — Access ports are intended to connect end-stations to the system,especially when the end-stations are incapable of generating VLAN tags.Access ports support a single VLAN (the PVID). Packets received untaggedare processed as if they are tagged with the access port PVID. Packetsreceived that are tagged with the PVID are also processed. Packets receivedthat are tagged with a VLAN other than the PVID are dropped.• Trunk — Trunk-mode ports are intended for switch-to-switch links. Trunkports can receive both tagged and untagged packets. Tagged packetsreceived on a trunk port are forwarded on the VLAN contained in the tag.Untagged packets received on a trunk port are forwarded on the nativeVLAN. Packets received on another interface belonging to the nativeVLAN are transmitted untagged on a trunk port.Table 21-1. VLAN AssignmentVLAN Assignment DescriptionPort-based (Static) This is the most common way to assign hosts to VLANs.The port where the traffic enters the switch determines theVLAN membership.IP Subnet Hosts are assigned to a VLAN based on their IP address. Allhosts in the same subnet are members of the same VLAN.MAC-Based The MAC address of the device determines the VLANassignment. This type of VLAN is useful when a hostmight not always connect to the network through the sameport but needs to be on the same VLAN.Protocol Protocol-based VLANs were developed to separate trafficbased on the protocol type before IP traffic became the defacto standard in the LAN. Use a protocol-based VLAN onnetworks where you might have a group of hosts that useIPX or another legacy protocol. With protocol-basedVLANs, you can segregate traffic based on the EtherTypevalue in the frame.
