3Com S7902E Command Reference Manual - page 438
1-27
Default Level
2: System level
Parameters
instance instance-id
: Sets the priority of the current port(s) in a particular spanning tree instance. The
value of
instance-id
ranges from
0 to 31. The minimum value
is 0, representing the CIST.
priority
: Port priority, in the range of 0 to 240 in steps of 16 (0, 16, 32…, for example).
Description
Use the
stp port priority
command to set the priority of the port(s).
Use the
undo stp port priority
command to restore the system default.
By default, the port priority is 128.
Note that:
z
Configured in port view, the setting takes effect on the current port only; configured in port group
view, the setting takes effect on all ports in the port group.
z
Configured in Layer-2 aggregate port view, the setting takes effect only on the aggregate port.
Configured on the member port in an aggregation group, the setting can take effect only after the
port leaves the aggregation group. For detailed information about link aggregation, refer to
Link
Aggregation Configuration
in the
Access Volume
.
z
If you set
instance-id
to 0, you are setting the priority of the port in the CIST. The priority of a port
can affect the role selection of the port in the specified MSTI.
z
Setting different priorities for the same port in different MSTIs allows different VLAN traffic flows to
be forwarded along different physical links, thus to enable VLAN-based load balancing.
z
When the priority of a port is changed in an MSTI, MSTP will re-compute the role of the port and
initiate a state transition in the MSTI.
z
If you do not provide
instance
instance-id
, your configuration will take effect in the CIST only.
Examples
# Set the priority of port GigabitEthernet 2/0/3 in MSTI 2 to 16.
[Sysname] interface GigabitEthernet 2/0/3
[Sysname-GigabitEthernet2/0/3] stp instance 2 port priority 16
stp port-log
Syntax
stp
port-log
{
all
|
instance
instance-id
}
undo
stp
port-log
{
all
|
instance instance-id
}
View
System view
Default Level
2: System level