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VLANs provide greater network efficiency by reducing broadcast
traffic, but also allow you to make network changes without
having to update IP addresses or IP subnets. VLANs inherently
provide a high level of network security, since traffic must pass
through a Layer 3 switch or a router to reach a different VLAN.
This switch supports the following VLAN features:
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Up to 256 VLANs based on the IEEE 802.1Q standard
•
Distributed VLAN learning across multiple switches using
explicit or implicit tagging and GVRP protocol
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Port overlapping, allowing a port to participate in multiple
VLANs
•
End stations can belong to multiple VLANs
•
Passing traffic between VLAN-aware and VLAN-unaware
devices
•
Priority tagging
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Port trunking with VLANs
Assigning Ports to VLANs
Before enabling VLANs for the switch, you must first assign each
port to the VLAN group(s) it will participate in. (By default all
ports are assigned to VLAN 1 as untagged ports.) Add a port as a
tagged port (that is, a port attached to a VLAN-aware device) if you
want it to carry traffic for one or more VLANs and the device at the
other end of the link also supports VLANs. Then assign the port at
the other end of the link to the same VLAN(s). However, if you
want a port on this switch to participate in one or more VLANs,
but the device at the other end of the link does not support
VLANs, then you must add this port as an untagged port (that is, a
port attached to a VLAN-unaware device).
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