HP A5120 EI Series Configuration Guide

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Configuring MSTP
Configuring an MST region
Make the following configurations on the root bridge and on the leaf nodes separately.
Follow these steps to configure an MST region:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter MST region view
stp region-configuration
—
Configure the MST region name
region-name name
Optional
The MST region name is the MAC
address by default.
Configure the VLAN-to-instance
mapping table
instance instance-id vlan vlan-list
Optional
Use either command.
All VLANs in an MST region are
mapped to the CIST (or MSTI 0)
by default.
vlan-mapping modulo modulo
Configure the MSTP revision level
of the MST region
revision-level level
Optional
0 by default.
Display the MST region
configurations that are not
activated yet
check region-configuration
Optional
Activate MST region configuration
manually
active region-configuration
Required
Display the activated
configuration information of the
MST region
display stp region-configuration [
| { begin | exclude | include }
regular-expression ]
Optional
Available in any view
NOTE:
 Two or more MSTP-enabled 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, VLAN-to-instance mapping entries in the MST
region, and MST region revision level, and they are connected via a physical link.
 The configuration of MST region–related parameters, especially the VLAN-to-instance mapping table, will cause
MSTP to begin a new spanning tree calculation process, which might result in network topology instability. To
reduce the possibility of topology instability caused by configuration, MSTP does not immediately begin a new
spanning tree calculation process when it is processing MST region–related configurations. Instead, such
configurations takes effect only after you activate the MST region–related parameters by using the active region-
configuration command, or enable MSTP by using the stp enable command if MSTP is disabled.
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.

HP A5120 EI Series Specifications

General

Uplink Ports	4 x SFP
Stacking	No
Management	CLI, Web, SNMP
Routing Protocols	RIP, OSPF
Power Supply	AC
MAC Address Table Size	16K
Dimensions	440 x 430 x 44 mm
Operating Temperature	0°C to 45°C
Operating Humidity	10% to 90% non-condensing
Model	HP A5120-24G EI Switch (JG234A)
VLANs	4094