182 CHAPTER 14: MSTP CONFIGURATION
■ Network topology changes are detected.
Configuration procedure
Configuration example
# Enable a switch to send trap messages conforming to 802.1d standard to the
network management device when the switch becomes the root bridge of
instance 1.
<4210> system-view
[4210] stp instance 1 dot1d-trap newroot enable
Displaying and
Maintaining MSTP
You can verify the above configurations by executing the display commands in
any view.
Execute the reset command in user view to clear statistics about MSTP.
MSTP Configuration
Example
Network requirements
Implement MSTP in the network shown in Figure 54 to enable packets of different
VLANs to be forwarded along different spanning tree instances. The detailed
configurations are as follows:
■ All switches in the network belong to the same MST region.
■ Packets of VLAN 10, VLAN 30, VLAN 40, and VLAN 20 are forwarded along
spanning tree instance 1, instance 3, instance 4, and instance 0 respectively.
In this network, Switch A and Switch B operate on the convergence layer; Switch
C and Switch D operate on the access layer. VLAN 10 and VLAN 30 are limited in
the convergence layer and VLAN 40 is limited in the access layer. Switch A and
Tabl e 139 Enable trap messages conforming to 802.1d standard
Operation Command Description
Enter system view system-view -
Enable trap messages
conforming to 802.1d
standard in an instance
stp [ instance instance-id ]
dot1d-trap [ newroot |
topologychange ] enable
Required
Tabl e 140 Display and maintain MSTP
Operation Command
Display the state and statistics information
about spanning trees of the current device
display stp [ instance instance-id ] [
interface interface-list | slot slot-number ] [
brief ]
Display region configuration display stp region-configuration
Display information about the ports that are
shut down by STP protection
display stp portdown
Display information about the ports that are
blocked by STP protection
display stp abnormalport
Display information about the root port of the
instance where the switch reside
display stp root
Clear statistics about MSTP reset stp [ interface interface-list ]
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