Falcon
M-Class
| User Guide
56
Virtual LAN, commonly known as VLAN, is a group of hosts with a common set of requirements that
communicate as if they were attached to the same LAN, regardless of their physical location. A VLAN
has the same attributes as a physical LAN, but allows for end stations to be grouped together even if
they are not located on the same LAN segment. Network reconfiguration can be done through
software instead of physically relocating devices.
A VLAN can be thought of as a broadcast domain that exists within a defined set of switches. Ports
on a switch can be grouped into VLANs in order to limit traffic flooding since it is limited to ports
belonging to that VLAN and its ports. Any switch port can belong to a VLAN. Frames are forwarded
and flooded only to ports in the same VLAN. Each VLAN is a logical network, and packets destined
for stations that do not belong to the same VLAN must be forwarded through a router.
VLANs are essentially Layer 2 constructs, whereas IP subnets are Layer 3 constructs. In a LAN employing VLANs,
a one-to-one relationship often exists between VLANs and IP subnets, although it is possible to have multiple
subnets on one VLAN or have one subnet spread across multiple VLANs. Virtual LANs and IP subnets provide
independent Layer 2 and Layer 3 constructs that map to one another and this correspondence is useful during
the network design process.
In Metro-Ethernet applications VLANs are being used to enable service separation: each VLAN relates
to a different service while disallowing different services/users to communicate with each other. The
usage of VLANs to enable Metro Ethernet services is further enhanced by the Provider Bridges
approach which uses QinQ capabilities as described in Section
Summary of Contents for Falcon Gen-3 M-Class
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