236 CHAPTER 23: MSTP CONFIGURATION
MSTP Configuration
Example
Network requirements
Configure MSTP so that packets of different VLANs are forwarded along different
spanning trees. The specific configuration requirements are as follows:
■ All devices on the network are in the same MST region.
■ Packets of VLAN 10 are forwarded along MST region 1, those of VLAN 30 are
forwarded along MST instance 3, those of VLAN 40 are forwarded along MST
instance 4, and those of VLAN 20 are forwarded along MST instance 0.
■ Device A and Device B are convergence layer devices, while Device C and
Device D are access layer devices. VLAN 10 and VLAN 30 are terminated on the
convergence layer devices, and VLAN 40 is terminated on the access layer
devices, so the root bridges of MST instance 1 and MST instance 3 are Device A
and Device B respectively, while the root bridge of MST instance 4 is Device C.
Network diagram
Figure 62 Network diagram for MSTP configuration
n
“Permit:” beside each link in the figure is followed by the VLANs the packets of
which are permitted to pass this link.
View the information of port role
calculation history for the specified
MSTP instance or all MSTP
instances
display stp [ instance
instance-id ] history
Available in any view
View the statistics of TC/TCN
BPDUs sent and received by all
ports in the specified MSTP
instance or all MSTP instances
display stp [ instance
instance-id ] tc
Available in any view
View the status information and
statistics information of MSTP
display stp [ instance
instance-id ] [ interface
interface-list ] [ brief ]
Available in any view
View the information about MST
region configuration in effect
display stp
region-configuration
Available in any view
View root bridge information of all
MSTP instances
display stp root Available in any view
Clear the statistics information of
MSTP
reset stp [ interface
interface-list ]
Available in user view
To do… Use the command… Remarks
Device A
Device B
Device D
Device C
Permit:all VLAN
Permit:VLAN 20,40
Permit:
VLAN 10,20
Permit:
VLAN 10,20
Permit:
VLAN 20,30
Permit:
VLAN 20,30
To Next Page
Loading...
