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Configuration procedure
Follow these steps to enable trap messages conforming to 802.1d standard:
To do... Use the command... Remarks
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
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.
<Sysname> system-view
[Sysname] stp instance 1 dot1d-trap newroot enable
Displaying and Maintaining MSTP
To do... Use the command... Remarks
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
Available in any
view
Clear statistics about MSTP reset stp [ interface interface-list ]
Available in user
view
MSTP Configuration Example
Network requirements
Implement MSTP in the network shown in Figure 1-9 to enable packets of different VLANs to be
forwarded along different MSTIs. The detailed configurations are as follows:
z All switches in the network belong to the same MST region.
z Packets of VLAN 10, VLAN 30, VLAN 40, and VLAN 20 are forwarded along MSTI 1, MSTI 3, MSTI
4, and MSTI 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 Switch B are configured as the root bridges of MSTI 1 and
MSTI 3 respectively. Switch C is configured as the root bridge of MSTI 4.