Configuring Port Priority; Configuring Whether Ports Connect To Point-To-Point Links; Configuring The Mode A Port Uses To Recognize/Send Mstp Packets - 3Com MSR 50 Series Configuration Manual

Configuring Port Priority

n
Configuring Whether
Ports Connect to
Point-to-Point Links
Configuring the Mode a
Port Uses to
Recognize/Send MSTP
Packets
The priority of a port is an import basis that determines whether the port can be
elected as the root port of device. If all other conditions are the same, the port
with the highest priority will be elected as the root port.
On an MSTP-compliant device, a port can have different priorities in different MST
instances, and the same port can play different roles in different MST instances, so
that data of different VLANs can be propagated along different physical paths,
thus implementing per-VLAN load balancing. You can set port priority values
based on the actual networking requirements.
Configuration procedure
Follow these steps to configure the priority of a port or a group of ports:
To do...
Enter system view
Enter Ethernet Enter Ethernet
interface view interface view
or port group
Enter port
view
group view
Configure port priority
When the priority of a port is changed, MSTP will re-compute the role of the
■
port and initiate a state transition.
Generally, a lower configured value priority indicates a higher priority of the
■
port. If you configure the same priority value for all the Ethernet ports on the a
device, the specific priority of a port depends on the index number of that port.
Changing the priority of an Ethernet port triggers a new spanning tree
computing process.
Configuration example
# Set the priority of port Ethernet 1/0 to 16 in MST instance 1.
<Sysname> system-view
[Sysname] interface ethernet 1/0
[Sysname-Ethernet1/0] stp instance 1 port priority 16
Refer to "Configuring Whether Ports Connect to Point-to-Point Links" on page
467.
Refer to "Configuring the Mode a Port Uses to Recognize/Send MSTP Packets" on
page 468.
Use the command...
system-view
interface interface-type
interface-number
port-group { manual
port-group-name |
aggregation agg-id }
stp [ instance instance-id ]
port priority priority
Configuring Leaf Nodes
Remarks
-
User either command
Configured in Ethernet
interface view, the setting is
effective on the current port
only; configured in port
group view, the setting is
effective on all ports in the
port group.
Optional
128 for all Ethernet ports by
default
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