LB9030A-R2_LB9031A-R2_LB9032A-R2
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VLAN Membership
VLAN IMPLEMENTATION ALLOWS:
VLANs across multiple switches by using explicit or implicit tagging and the
GARP/GVRP protocol defined in IEEE802.1p and 802.1Q.
An end station’s network interface card may belong to multiple VLANs.
A switch port may 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 traffic volume.
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 Registration Protocol). GVRP allows for
dynamic registration of VLAN port members within switch and across multiple
switches.
Other than supporting dynamic updating of registration entries in a switch,
GVRP is used to communicate VLAN registration information to other
VLAN-aware switches, so that a VLAN member can cover a wide span of
switches on a network.
GVRP allows both VLAN-aware workstations and switches to issue and
revoke VLAN memberships. VLAN-aware switches register and propagate
VLAN membership to all ports that belong to the active topology of the VLAN.
