User Guide
22
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5.6 Trunk
Trunking is used to expand bandwidth, for failover, and/or to increase error toler-
ance when networking multiple switches together.
All
por
ts
tha
t
ar
e
defined
as
members
of
the
trunk
gr
oup
can
be
us
ed
f
or
trunking
ONL
Y
and
cannot
be
us
ed
f
or
other
purpo
ses,
e
ven
when
the
y
ar
e
not
being
us
ed
b
y
the
trunk
gr
oup.
Cr
oss-VLAN
trunk
gr
ouping
is
not
suppor
ted.
All
members
of
a
trunk
gr
oup
must
be
within
the
s
ame
VL
AN.
Otherwis
e
the
trunk
will
not
func
tion
pr
operly.
When
the
trunk
gr
oup
is
us
ed
f
or
int
er-switch
cas
cading
(Uplinks),
be
sur
e
the
cas
-
cading
por
t
us
ed
f
or
c
onnecting
with
the
other
s
witch
is
par
t
of
the
c
orresponding
trunk
gr
oup.
The
cas
cading
of
multiple
por
ts
(trunk
members)
must
be
done
fr
om
one
trunk
gr
oup
t
o
a
c
orresponding
trunk
gr
oup.
CAUTION: Never connect two trunk groups of a switch together or
cascade two switches through more than one trunk channel.
Such configurations will result in a network loop and will
cause a broadcast storm resulting in blocking of all network
traffic on the switches.
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