Configuring The Work Mode Of An Mstp Device; Configuring The Priority Of A Device - HP A6600 Configuration Manual

Configuring the work mode of an MSTP device

Being mutually compatible, MSTP and RSTP can recognize each other's protocol packets. However, STP
is unable to recognize MSTP packets. For hybrid networking with legacy STP devices and for full
interoperability with RSTP-enabled devices, MSTP supports three work modes: STP-compatible mode,
RSTP mode, and MSTP mode.
In STP-compatible mode, all ports of the device send out STP BPDUs,
•
In RSTP mode, all ports of the device send out RSTP BPDUs. If the device detects that it is connected
•
with a legacy STP device, the port connecting with the legacy STP device automatically migrates to
STP-compatible mode.
• In MSTP mode, all ports of the device send out MSTP BPDUs. If the device detects that it is connected
with a legacy STP device, the port connecting with the legacy STP device automatically migrates to
STP-compatible mode.
Make this configuration on the root bridge and on the leaf nodes separately.
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

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 is 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
Use the command...
system-view
stp mode { stp | rstp | mstp }
Use the command...
system-view
stp [ instance instance-id ] priority
priority
58
Remarks
—
Required
MSTP mode by default
Remarks
—
Required
32,768 by default