76 CHAPTER 4: VLAN O VERVIEWCurrently, the 3Com Switch 4210 Family adopts the IVL mode only. For moreinformation about the MAC address forwarding table, refer to “MAC AddressTable Management” on page 131.VLAN Classification Depending on how VLANs are established, VLANs fall into the following sixcategories.■ Port-based VLANs■ MAC address-based VLANs■ Protocol-based VLANs■ IP-subnet-based VLANs■ Policy-based VLANs■ Other typesThe Switch 4210 currently supports port-based VLANs.Port-Based VLAN Port-based VLAN technology introduces the simplest way to classify VLANs. Youcan assign the ports on the device to different VLANs. Thus packets received on aport will be transmitted through the corresponding VLAN only, so as to isolatehosts to different broadcast domains and divide them into different virtualworkgroups.Ports on Ethernet switches have the three link types: access, trunk, and hybrid. Forthe three types of ports, the process of being added into a VLAN and the way offorwarding packets are different. For details, refer to “Port Basic Configuration”on page 95.Port-based VLANs are easy to implement and manage and applicable to hosts withrelatively fixed positions.
