102
Displaying and maintaining the spanning tree
Task Command
Remarks
Display information about ports blocked
by spanning tree protection functions.
display stp abnormal-port
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display BPDU statistics on ports.
display stp bpdu-statistics
[
interface
interface-type interface-number
[
instance
instance-id
] ] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display information about ports shut
down by spanning tree protection
functions.
display stp down-port
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display the historical information of port
role calculation for the specified MSTI or
all MSTIs.
display stp
[
instance
instance-id
|
vlan
vlan-id
]
history
[
slot
slot-number
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display the statistics of TC/TCN BPDUs
sent and received by all ports in the
specified MSTI or all MSTIs.
display stp
[
instance
instance-id
|
vlan
vlan-id
]
tc
[
slot
slot-number
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display the spanning tree status and
statistics.
display stp
[
instance
instance-id
|
vlan
vlan-id
]
[
interface
interface-list
|
slot
slot-number
]
[
brief
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display the MST region configuration
information that has taken effect.
display stp region-configuration
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Display the root bridge information of all
MSTIs.
display stp root
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in any view
Clear the spanning tree statistics.
reset stp
[
interface
interface-list
]
Available in user view
Spanning tree configuration examples
MSTP configuration example
Network requirements
As shown in
:
•
All devices on the network are in the same MST region. Device A and Device B work at the
distribution layer. Device C and Device D work at the access layer.
•
Configure MSTP so that packets of different VLANs are forwarded along different spanning trees:
Packets of VLAN 10 are forwarded along MSTI 1, those of VLAN 30 are forwarded along MSTI 3,
those of VLAN 40 are forwarded along MSTI 4, and those of VLAN 20 are forwarded along MSTI
0.
•
VLAN 10 and VLAN 30 are terminated on the distribution layer devices, and VLAN 40 is
terminated on the access layer devices. The root bridges of MSTI 1 and MSTI 3 are Device A and
Device B, respectively, and the root bridge of MSTI 4 is Device C.
