Configuring The Priority Of A Device; Configuring The Maximum Hops Of An Mst Region - HP 5820X series Configuration Manual

To configure the MSTP work mode:
To do...
1. Enter system view
2. Configure the work mode of
MSTP

Configuring the priority of a device

CAUTION:
After configuring a device as the root bridge or a secondary root bridge, you cannot change the
•
priority of the device.
During root bridge selection, if all devices in a spanning tree have the same priority, the one with the
•
lowest MAC address will be selected as the root bridge of the spanning tree.
Device priorities participate in spanning tree calculation. The priority of a device determines whether it
can be elected as the root bridge of a spanning tree. A lower value indicates a higher priority. By setting
the priority of a device to a low value, you can specify the device as the root bridge of the spanning tree.
An MSTP-enabled device can have different priorities in different MSTIs.
Make this configuration on the root bridge only.
To configure the priority of a device in a specified MSTI:
To do...
1. Enter system view
2. Configure the priority of the
current device in a specified
MSTI

Configuring the maximum hops of an MST region

By setting the maximum hops of an MST region, you can restrict the region size. The maximum hops
configured on the regional root bridge will be used as the maximum hops of the MST region.
The regional root bridge always sends a configuration BPDU with a hop count set to the maximum value.
When a switch receives this configuration BPDU, it decrements the hop count by 1 and uses the new hop
count in the BPDUs it propagates. When the hop count of a BPDU reaches 0, it is discarded by the
device that received it. Devices beyond the reach of the maximum hop can no longer take part in
spanning tree calculation, and the size of the MST region is confined.
Make this configuration on the root bridge only. All devices other than the root bridge in the MST region
use the maximum hop value set for the root bridge.
To configure the maximum number of hops of an MST region:
To do...
1. Enter system view
2. Configure the maximum hops
of the MST region
Use the command...
system-view
stp mode { stp | rstp | mstp }
Use the command...
system-view
stp [ instance instance-id ] priority
priority
Use the command...
system-view
stp max-hops hops
74
Remarks
—
Required
MSTP mode by default
Remarks
—
Required
32,768 by default
Remarks
—
Required
20 by default