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Since spanning tree is group based, the physical port in the above diagram participates in
three spanning tree instances: one for untagged traffic and two for 802.1Q tagged traffic. Both
types of frames can now pass through the same port.
♦ Important Notes ♦
Since a trunk is a service, and Alcatel switches have a
16 (10/100) or 15 (Gigabit) services per port limit, only
15 or 14
802.1Q groups can be added to the same port.
In both cases, a default bridge service occupies one of
the service slots.
For Kodiak ASIC-based Fast Ethernet and Gigabit Ether-
net modules, up to 64 groups are supported using
multiple spanning tree on an
802.1Q link. To support 64
groups, the following lines should be added into the
mpx.cmd file :
MaxEthQGroups=64
MaxGigaQGroups=64
See Chapter 7, “Managing Files,” for more information
on editing text files.
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