Configuring The Work Mode Of Mstp Device; Configuring The Priority Of The Current Device - 3Com MSR 50 Series Configuration Manual

462 C 23: MSTP C
HAPTER
Configuring the Work
Mode of MSTP Device
Configuring the Priority
of the Current Device
ONFIGURATION
Alternatively, you can also specify the current device as the root bridge by
■
setting by priority of the device to 0. For the device priority configuration, refer
to "Configuring the Priority of the Current Device" on page
Configuration example
# Specify the current device as the root bridge of MST instance 1 and a secondary
root bridge of MST instance 2.
<Sysname> system-view
[Sysname] stp instance 1 root primary
[Sysname] stp instance 2 root secondary
MSTP and RSTP can recognize each other's protocol packets, so they are mutually
compatible. However, STP is unable to recognize MSTP packets. For hybrid
networking with legacy STP devices and full interoperability with RSTP-compliant
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 will automatically migrate 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 will automatically migrate to STP-compatible mode.
Configuration procedure
Follow these steps to configure the MSTP work mode:
To do...
Enter system view
Configure the work mode of
MSTP
Configuration example
# Configure MSTP to work in STP-compatible mode.
<Sysname> system-view
[Sysname] stp mode stp
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 spanning
tree. An MSTP-compliant device can have different priorities in different MST
instances.
Configuration procedure
Follow these steps to configure the priority of the current device:
To do...
Enter system view
Use the command...
system-view
stp mode { stp | rstp | mstp } Optional
Use the command...
system-view
462.
Remarks
-
MSTP mode by default
Remarks
-