There are three basic configurations to determine and control how a switch
assigns packets to a VLAN. Port-group
membership; Membership by MAC; and
Layer 3-based VLANs.
B
Resource can help you assess which VLAN is right for your corporate network. And
we can install the solution. Call (281) 440-7300 and ask to speak with a network
specialist.
Port-group membership
A
port group VLAN assigns each port of a switch to a VLAN. For example, ports 1-3
on a switch might be assigned to the Human Resources Deptartment, ports 4-6 to
Sales, and so on. This method of defining VLAN membership is the most commonly
implemented because configuration is relatively easy. When a user moves to a
different port, the administrator can manually reassign the new port to the
user's old VLAN without having to perform rewiring.
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In
this model, MAC-layer addresses are hard-coded into the workstation's interface
card, with each switch maintaining a table of MAC addresses and their
corresponding VLAN memberships. Determining VLAN membership by its source or
destination MAC address automates the user tracking function, thereby
eliminating the need to reconfigure the IP address on the switch when a
workstation is physically relocated to a different port.
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In
this implementation, VLANs identify packet membership based on the protocol type
or network-layer address, arguably the most logical way to group users. This
partitioning method enables administrators to relocate users without having to
reconfigure each workstation's network address. It also eliminates the need for
'frame tagging' in order to communicate VLAN membership between switches, which
reduces transport overhead.
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