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About Virtual LANs
Virtual LANs enable network managers to group
users logically rather than by physical location. A virtual LAN
(VLAN) is an emulation of a standard LAN that allows data transfer
and communication to occur without the traditional restraints placed
on the network. It can also be considered a broadcast domain set up
within a switch. With VLANs, switches can support more than one
subnet (or VLAN) on each switch, and give routers and switches the
opportunity to support multiple subnets on a single physical link. A
group of devices that belong to the same VLAN, but are part of
different LAN segments, are configured to communicate as if they
were part of the same LAN segment. Layer 3 switching supports up to
244 VLAN subinterfaces per system.
VLANs enable efficient traffic separation and
provide excellent bandwidth utilization. VLANs also alleviate
scaling issues by logically segmenting the physical LAN structure
into different subnetworks so that packets are switched only between
ports within the same VLAN. This can be very useful for security,
broadcast containment, and accounting.
Layer 3 switching software supports a port-based
VLAN on a trunk port, which is a port that carries the traffic of
multiple VLANs. Each frame transmitted on a trunk link is tagged as
belonging to only one VLAN.
Layer 3 switching software supports VLAN frame
encapsulation through the Inter-Switch Link (ISL) protocol and the
802.1Q standard on both the Catalyst 2948G-L3 and the Catalyst
4908G-L3 switch routers.
Figure 5-1 shows a network topology where two
VLANs span a Catalyst 5500 switch and a Catalyst 2948G-L3 switch
router. Both VLANs in this topology are bridged using the
Inter-Switch Link (ISL) protocol.
Figure 5-1 VLANs Spanning Devices in a Network
 |
Note Four adjacent Fast Ethernet ports on the
Catalyst 2948G-L3 (such as Fast Ethernet 1 through 4 or Fast
Ethernet 45 through 48) must all use the same VLAN
encapsulation; that is, either ISL or 802.1Q. |
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