Nortel 450-24t 用户指南
Using the BayStack 450 10/100/1000 Series Switch
1-50
309978-D Rev 01
Supported VLAN Types
Your BayStack 450 switch supports two types of VLANs:
•
Port-based VLANs
A port-based VLAN is a VLAN in which the ports are explicitly configured to
be in the VLAN. When you create a port-based VLAN, you assign a Port
VLAN Identifier (PVID) and specify which ports belong to the VLAN. The
PVID is used to coordinate VLANs across multiple switches.
be in the VLAN. When you create a port-based VLAN, you assign a Port
VLAN Identifier (PVID) and specify which ports belong to the VLAN. The
PVID is used to coordinate VLANs across multiple switches.
•
Protocol-based VLANs
A protocol-based VLAN is a VLAN in which you assign your switch ports as
members of a broadcast domain, based on the protocol information within the
packet. Protocol-based VLANs can localize broadcast traffic and assure that
only the protocol-based VLAN ports are flooded with the specified protocol
type packets. Your switch ports can be members of multiple protocol-based
VLANs that are not based on the same protocol. Only tagged ports can be
members of multiple protocol-based VLANs that are based on the same
protocol.
members of a broadcast domain, based on the protocol information within the
packet. Protocol-based VLANs can localize broadcast traffic and assure that
only the protocol-based VLAN ports are flooded with the specified protocol
type packets. Your switch ports can be members of multiple protocol-based
VLANs that are not based on the same protocol. Only tagged ports can be
members of multiple protocol-based VLANs that are based on the same
protocol.
You can create port-based VLANs and protocol-based VLANs, in any
combination, as long as you do not exceed a total of 64 VLANs.
combination, as long as you do not exceed a total of 64 VLANs.
IEEE 802.1Q VLAN Workgroups
Your BayStack 450 switch supports up to 64 VLANs with 802.1Q tagging
available per port. Ports are grouped into broadcast domains by assigning them to
the same VLAN. Frames received in one VLAN can only be forwarded within
that VLAN, and IP multicast frames and unknown unicast frames are flooded only
to ports in the same VLAN.
available per port. Ports are grouped into broadcast domains by assigning them to
the same VLAN. Frames received in one VLAN can only be forwarded within
that VLAN, and IP multicast frames and unknown unicast frames are flooded only
to ports in the same VLAN.
Setting up virtual LANs (VLANs) is a way to segment networks to increase
network capacity and performance without changing the physical network
topology (Figure 1-22). With network segmentation, each switch port connects to
a segment that is a single broadcast domain. When a switch port is configured to
be a member of a VLAN, it is added to a group of ports (workgroup) that belong
to one broadcast domain.
network capacity and performance without changing the physical network
topology (Figure 1-22). With network segmentation, each switch port connects to
a segment that is a single broadcast domain. When a switch port is configured to
be a member of a VLAN, it is added to a group of ports (workgroup) that belong
to one broadcast domain.