HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 76

Configuring the root bridge or a secondary root bridge, Configuration restrictions and guidelines

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Step 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. 8. Display the activated configuration information of the MST region. Command • 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 ] Remarks 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 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. A device has independent roles in different spanning trees. It can act as the root bridge in one spanning tree and as a secondary root bridge in another. However, one device cannot be the root bridge and a secondary root bridge in the same spanning tree. A spanning tree can have one root bridge only. If two or more devices are designated as the root bridge in a spanning tree at the same time, the device with the lowest MAC address wins. When the root bridge of an instance fails or is shut down, the secondary root bridge (if you have specified one) can take over the role of the primary root bridge. However, if you specify a new primary root bridge for the instance then, the one you specify, not the secondary root bridge will become the root bridge. If you have specified multiple secondary root bridges for an instance, when the root bridge fails, the secondary root bridge with the lowest MAC address is selected as the new root bridge. Configuration restrictions and guidelines • You can specify one root bridge for each spanning tree, regardless of the device priority settings. Once you specify a device as the root bridge or a secondary root bridge, you cannot change its priority. • You can configure the current device as the root bridge by setting the device priority to 0. For the device priority configuration, see "Configuring the device priority." 67

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67
Step
Command
Remarks
4.
Configure the
VLAN-to-instance
mapping table.
•
instance
instance-id
vlan
vlan-list
•
vlan-mapping modulo
modulo
Optional.
Use either command.
All VLANs in an MST region are mapped
to the CIST (or MSTI 0) by default.
5.
Configure the MSTP
revision level of the MST
region.
revision-level
level
Optional.
0 by default.
6.
Display the MST region
configurations that are
not activated yet.
check region-configuration
Optional.
7.
Activate MST region
configuration manually.
active region-configuration
N/A
8.
Display the activated
configuration
information of the MST
region.
display stp region-configuration
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Optional.
Available in any view
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.
A device has independent roles in different spanning trees. It can act as the root bridge in one spanning
tree and as a secondary root bridge in another. However, one device cannot be the root bridge and a
secondary root bridge in the same spanning tree.
A spanning tree can have one root bridge only. If two or more devices are designated as the root bridge
in a spanning tree at the same time, the device with the lowest MAC address wins.
When the root bridge of an instance fails or is shut down, the secondary root bridge (if you have
specified one) can take over the role of the primary root bridge. However, if you specify a new primary
root bridge for the instance then, the one you specify, not the secondary root bridge will become the root
bridge. If you have specified multiple secondary root bridges for an instance, when the root bridge fails,
the secondary root bridge with the lowest MAC address is selected as the new root bridge.
Configuration restrictions and guidelines
•
You can specify one root bridge for each spanning tree, regardless of the device priority settings.
Once you specify a device as the root bridge or a secondary root bridge, you cannot change its
priority.
•
You can configure the current device as the root bridge by setting the device priority to 0. For the
device priority configuration, see "
Configuring the device priority
."