Configuring An Mst Region; Configuration Restrictions And Guidelines; Configuration Procedure - HP 5120 EI Series Lan Switching Configuration Manual

Step
2. Set the spanning tree mode.

Configuring an MST region

Two or more spanning tree devices belong to the same MST region only if they are configured to have the
same format selector (0 by default, not configurable), MST region name, MST region revision level, and
the same VLAN-to-instance mapping entries in the MST region, and each two devices are connected by
a physical link.

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
1. Enter system view.
2. Enter MST region view.
3. Configure the MST
region name.
4. Configure the
VLAN-to-instance
mapping table.
5. Configure the MSTP
revision level of the MST
region.
6. Display the MST region
configurations that are
not activated yet.
7. Activate MST region
configuration manually.
Command
stp mode { stp | rstp | mstp | pvst }
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
75
Remarks
MSTP mode by default.
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