© Copyright Lenovo 2016
Chapter 4: Configuration Commands
453
Spanning Tree Configuration
Enterprise
NOS
supports
the
IEEE
802.1D
(2004)
Rapid
Spanning
Tree
Protocol
(RSTP),
the
IEEE
802.1Q
(2003)
Multiple
Spanning
Tree
Protocol
(MSTP),
and
Per
VLAN
Rapid
Spanning
Tree
Protocol
(PVRST).
The
Spanning
Tree
Protocol
(STP)
is
used
to
prevent
loops
in
the
network
topology.
Up
to
128
Spanning
Tree
Groups
(STGs)
can
be
configured
on
the
switch
(STG
128
is
reserved
for
management).
The
maximum
number
of
STGs
can
be
increased
to
256.
In
this
case,
STG
256
is
reserved
for
management.
Note:
When
VRRP
is
used
for
active/active
redundancy,
STG
must
be
enabled.
Table 223.
Spanning
Tree
Configuration
Options
Command Syntax and Usage
spanning
tree
loopguard
Enables
STP
loop
guard.
STP
loop
guard
prevents
ports
from
forwarding
traffic
if
no
BPDUs
are
received.
Ports
are
placed
into
a
loop
‐
inconsistent
blocking
state
until
a
BPDU
is
received.
Command
mode:
Global
configuration
spanning
tree
mode
[disable|mst|pvrst|rstp]
Selects
and
enables
Multiple
Spanning
Tree
mode
(
mst
),
Per
VLAN
Rapid
Spanning
Tree
mode
(
pvrst
)
or
Rapid
Spanning
Tree
mode
(
rstp
).
The
default
mode
is
PVRST
.
When
you
select
the
disable
option,
the
switch
globally
turns
Spanning
Tree
off
.
All
ports
are
placed
into
forwarding
state.
Any
BPDU’s
received
are
flooded.
Command
mode:
Global
configuration
[no]
spanning
tree
pvst
compatibility
Enables
or
disables
VLAN
tagging
of
Spanning
Tree
BPDUs.
The
default
setting
is
enabled
.
Command
mode:
Global
configuration
[no]
spanning
tree
stg
auto
Enables
or
disables
VLAN
Automatic
STG
Assignment
(VASA).
When
enabled,
each
time
a
new
VLAN
is
configured,
the
switch
will
automatically
assign
the
new
VLAN
its
own
STG.
Conversely,
when
a
VLAN
is
deleted,
if
its
STG
is
not
associated
with
any
other
VLAN,
the
STG
is
returned
to
the
available
pool.
Notes
:
When
using
VASA,
a
maximum
number
of
255
automatically
assigned
STGs
is
supported.
VASA
applies
only
to
PVRST
mode.
Command
mode:
Global
configuration
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