Configuration Restrictions And Guidelines; Configuration Procedure; Configuring The Root Bridge Or A Secondary Root Bridge - HP 3100 Series Configuration Manual

Configuration restrictions and guidelines

•
The configuration of MST region–related parameters, especially the VLAN-to-instance mapping
table, will result in a new spanning tree calculation. To reduce the possibility of topology
instability, the MST region configuration takes effect only after you activate it by using the active
region-configuration command, or enable a spanning tree protocol by using the stp enable
command in the case that the spanning tree protocol is disabled.
•
The device in PVST mode automatically maps VLANs to MSTIs, and supports more MSTIs
than in MSTP mode. When you change the spanning tree mode from PVST to MSTP,
exceeding VLAN-to-instance mappings (arranged in ascending order of MSTI IDs) are silently
deleted and cannot be recovered even if you change the spanning tree mode back. To prevent
loss of mappings, do not manually configure VLAN-to-instance mappings in PVST mode.

Configuration procedure

To configure an MST region:
Step
Enter system view.
1.
Enter MST region view.
2.
Configure the MST
3.
region name.
Configure the
4.
VLAN-to-instance
mapping table.
Configure the MSTP
5.
revision level of the
MST region.
Display the MST region
6.
configurations that are
not activated yet.
Activate MST region
7.
configuration manually.
Display the activated
8.
configuration
information of the MST
region.
Configuring the root bridge or a secondary root
bridge
You can have MSTP determine the root bridge of a spanning tree through MSTP calculation, or you
can specify the current device as the root bridge or as a secondary root bridge using the commands
that the system provides.
Command
system-view
stp region-configuration
region-name name
•
instance instance-id vlan
vlan-list
•
vlan-mapping modulo
modulo
revision-level level
check region-configuration
active region-configuration
display stp
region-configuration [ |
{ begin | exclude | include }
regular-expression ]
66
Remarks
N/A
N/A
Optional.
The MST region name is the MAC
address by default.
Optional.
Use either command.
All VLANs in an MST region are mapped
to the CIST (or MSTI 0) by default.
Optional.
0 by default.
Optional.
N/A
Optional.
Available in any view