3Com 10002211 manual Layer 3 Addressing Information

C-4 APPENDIX C: VLANS ON THE COREBUILDER SYSTEM

Table C-1 Supported Protocols for VLAN Configuration

Protocol Suite	Protocol Types
IP	IP, ARP, RARP (Ethertype, SNAP PID)
Novell IPX	IPX (Ethertype, DSAP, SNAP PID)
AppleTalk	DDP, AARP (Ethertype, SNAP PID)
Xerox XNS	XNS IDP, XNS Address Translation, XNS Compatibility
	(Ethertype, SNAP PID)
DECnet	DEC MOP, DEC Phase IV, DEC LAT, DEC LAVC (Ethertype,
	SNAP PID)
SNA	SNA Services over Ethernet (Ethertype)
Banyan VINES	Banyan (Ethertype, DSAP, SNAP PID)
X25	X.25 Layer 3 (Ethertype)
NetBIOS	NetBIOS (DSAP)
Default	Default (all protocol types)

Layer 3 Addressing Information

For IP VLANs only, the CoreBuilder 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 in “Overlapped IP VLANs” on page C-7.

Default VLAN When you start the CoreBuilder system, the system automatically creates a default VLAN. Initially, the default VLAN includes all of the switch ports in the system. In the CoreBuilder system, the default VLAN serves to define:

■The flood domain for protocols not supported by any VLAN in the system

■The flood domain for protocols supported by a VLAN in the system but received on nonmember ports

Both cases represent exception flooding conditions that are described in the following sections.