3Com 2500 manual Switch Ports, Layer 3 Addressing Information, Vlans On The Lanplex System

2-4 CHAPTER 2: VLANS ON THE LANPLEX® SYSTEM

Table 2-1 Supported Protocols for VLAN Configuration (continued)

Protocol Suite	Protocol Types
X25	X.25 Layer 3 (Ethertype)
NetBIOS™	NetBIOS (DSAP)
Default	Default (all protocol types)

Switch Ports

A group of switch ports is any combination of switch ports on the LANplex system. Included are switch ports created as ATM LAN Emulation Clients (ATM LECs). VLANs do not support media implementations that do not run over switch (bridge) ports, for example, ATM Logical IP Subnets (ATM LISs).

Layer 3 Addressing Information

For IP VLANs only, the LANplex system optionally supports configuring of individual IP VLANs with network layer subnet addresses. With this additional layer 3 information, you can create independent IP VLANs that share the same switch ports for multiple IP VLANs. Data is flooded according to both the protocol (IP) and the layer 3 information in the IP header to distinguish among multiple IP VLANs on the same switch port. This configuration is discussed later in the section “Overlapped IP VLANs.”