Displaying And Maintaining Mstp; Mstp Configuration Example - 3Com 4500G Family Configuration Manual

To do...
Enable BPDU dropping for the
port(s)

Displaying and Maintaining MSTP

To do...
View information about abnormally
blocked ports
View information about ports blocked
by STP protection functions
View the historical information of port
role calculation for the specified MSTI
or all MSTIs
View the statistics of TC/TCN BPDUs
sent and received by all ports in the
specified MSTI or all MSTIs
View the status information and
statistics information of MSTP
View the MST region configuration
information that has taken effect
View the root bridge information of all
MSTIs
Clear the statistics information of
MSTP

MSTP Configuration Example

Network requirements
All devices on the network are in the same MST region. Device A and Device B work on the
distribution layer, while Device C and Device D work on 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, so the root bridges of MSTI 1 and MSTI 3 are Device A and Device B
respectively, while the root bridge of MSTI 4 is Device C.
Use the command...
bpdu-drop any
Use the command...
display stp abnormal-port
display stp down-port
display stp [ instance
instance-id ] history
display stp [ instance
instance-id ] tc
display stp [ instance
instance-id ] [ interface
interface-list ] [ brief ]
display stp region-configuration
display stp root
reset stp [ interface interface-list ]
1-38
Remarks
Required
Disabled by default
Remarks
Available in any view
Available in any view
Available in any view
Available in any view
Available in any view
Available in any view
Available in any view
Available in user view