Nortel Networks 450 manual Ieee 802.1Q Vlan Workgroups, Port-Based Vlan Example

Using the BayStack 450 10/100/1000 Series Switch

IEEE 802.1Q VLAN Workgroups

BayStack 450 switches support up to 64 port-based 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.

Setting up virtual LANs (VLANs) is a way to segment networks to increase network capacity and performance without changing the physical network topology (Figure 1-15). 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.

The BayStack 450 switch allows you to assign ports to VLANs using the console or TELNET; VLAN assignment is not currently available through SNMP. You can assign different ports (and therefore the devices attached to these ports) to different broadcast domains. This feature allows network flexibility because you can reassign VLANs to accommodate network moves, additions, and changes, eliminating the need to change physical cabling.

VLAN 1

VLAN 2

BayStack 450-24T switch

BS45009A

Figure 1-15. Port-Based VLAN Example

1-32 302401-D Rev 00