1. Introduction-12
VLAN MEMBERSHIP
VLAN implementation allows:
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Up to 256 VLANs in one switch.
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VLANs across multiple switches by using explicit or implicit
tagging and the GARP/GVRP protocol defined in
IEEE802.1p and 802.1Q.
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An end station’s network interface card belong to multiple
VLANs.
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A switch port to be associated with multiple VLANs.
DEFINITIONS OF VLAN MEMBERSHIP
VLAN implementation allows VLAN membership to be defined
based on ports. Port-based VLANs are organized by physical
port number. For example, switch ports 1, 2, 4 and 6 can be
grouped on VLAN, while server ports 3, 5, 7 and 8 can be on
another VLAN. Broadcasts from servers within each group
would only go to the members of its own VLAN. This ensures
that broadcast storms cannot cause a network meltdown due to
volumes of traffic.
VLAN MEMBERSHIP LEARNING
Port-based VLAN is defined using a static binding between a
VLAN and its associated ports. The switch’s forwarding decision
is based on the destination MAC address and its associated port
ID. Therefore, to make valid forwarding and flooding decisions,
the switch learns the relationship of the MAC address to its
related port – and thus to the VLAN – at runtime.
REMOTE VLAN LEARNING
In addition to providing network management tools that allow
network administrators to statically add and delete VLAN
member ports, the switch also supports GVRP (GARP VLAN
