3Com 4007, Implementation Manual, Page: 264 / 684

264 C
HAPTER
14: V
IRTUAL
LAN
S
(VLAN
S
)
Mode Requirements Table 50 lists the requirements for defining VLANs in allOpen mode and
allClosed mode.
Table 50 Mode Requirements for Static VLANs
Type of Static
VLAN
Requirements
Port-based
(Layer 2 and
Multilayer
Switching
Modules)
For nonoverlapped port-based VLANs:
■
Protocol type of unspecified
■
Separate member ports (each port-based VLAN owns a
different set of ports)
For overlapped port-based VLANs:
■
Protocol type of unspecified
■
IEEE 802.1Q tagging for shared ports (the shared ports
can employ a tagging mode of none in only one VLAN;
shared ports in all other VLANs must use IEEE 802.1Q
tagging)
Protocol-based
(Multilayer
Switching
Modules)
For nonoverlapped protocol-based VLANs:
■
Either the protocol type is unique per VLAN or the
member ports are unique per VLAN
For overlapped protocol-based VLANs (multiple VLANs of the
same protocol type that share ports):
■
IEEE 802.1Q tagging for shared ports (the shared ports
can employ a tagging mode of none in only one of the
same protocol type VLANs; shared ports in all other
VLANs of the same protocol type must use IEEE 802.1Q
tagging
Network-based
(IP VLAN only on
Multilayer
Switching
Modules)
■
A Layer 3 address that is unique per network-based VLAN
■
For allOpen mode , no tagging restrictions on the shared
ports
■
For allClosed mode , IEEE 802.1Q tagging for shared ports
(the shared ports can employ a tagging mode of none in
only one of the network-based VLANs; shared ports in all
other network-based VLANs must use IEEE 802.1Q
tagging