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Types of VLANs
69
Figure 9
Two port-based VLANs spanning two Switch 9100 devices
VLAN
Accounting
spans Switch 1 and Switch 2 by way of a connection
between Switch 1, port 1 and Switch 2, port 3. VLAN
Engineering
spans
Switch 1 and Switch 2 by way of a connection between Switch 1, port 5,
and Switch 2, port 6.
Using the configuration described above, you can create multiple VLANs
that span multiple switches, in a daisy-chained fashion. Each switch must
have a dedicated port for each VLAN. Each dedicated port must be
connected to a port that is a member of its VLAN on the next switch.
Tagged VLANs
Tagging
is a process that inserts a marker (called a
tag
) into the Ethernet
frame. The tag contains the identification number of a specific VLAN,
called the
VLANid
.
The use of 802.1Q tagged packets may lead to the appearance of
packets slightly bigger than the current IEEE 802.3/Ethernet maximum of
1,518 bytes. This may affect packet error counters in other devices, and
may also lead to connectivity problems if non-802.1Q bridges or routers
are placed in the path.
91_005
Accounting Engineering
Switch 1
Switch 2