LevelOne IES-2881, User Manual

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User Manual Page 118
Use this command to set the port priority for a bridge group. The Multiple Spanning Tree
Protocol uses port priority as a tiebreaker to determine which port should forward frames
for a particular instance on a LAN, or which port should be the root port for an instance. A
lower value implies a better priority. In the case of the same priority, the interface index
will serve as the tiebreaker, with the lower-numbered interface being preferred over
others. The permitted range is 0-240. The priority values can only be set in increments of
16.
3.
Command Syntax:
bridge GROUP instance INSTANCE_ID priority PRIORITY
GROUP <1-1> Specify the bridge-group ID.
INSTANCE_ID <1-15> Specify the instance ID.
PRIORITY <0-240> Specify the port priority in a range of <0-240>.
4.
Example:
The following example sets the port priority ( 121 ) for Multiple Spanning Tree instance ( 3 )
to a port ( fe1 ) in bridge GROUP ( 1 ):
switch_a(config)#interface fe1
switch_a(config-if )#bridge-group 1 instance 3 priority 121
switch_a(config-if )#
Bridge-Group Instance Path-Cost:
1.
Command Mode: Interface mode
Logon to Configure Mode (Configure Terminal Mode).
Then logon to Interface mode.
fe1 means port 1.
The
switch_a(config-if)# prompt will show on the screen.
switch_a(config)#interface fe1
switch_a(config-if )#
2.
Usage:
Use this command to set the cost of a path associated with an interface. Use the no
parameter with this command to restore the default cost value of the path. A lower
path-cost indicates a greater likelihood of the specific interface becoming a root.
3.
Command Syntax:
bridge GROUP instance INSTANCE_ID path-cost PATH_COST
GROUP <1-1> Specify the bridge-group ID.
INSTANCE_ID <1-15> Specify the instance ID.
PATH_COST <1-200000000> Specify the cost of path in the range of <1-200000000>.
4.
Example:
The following example sets the path cost ( 1000 ) for Multiple Spanning Tree instance ( 3 ) to
a port ( fe1 ) in bridge GROUP ( 1 ):
switch_a(config)#interface fe1
switch_a(config-if )#bridge-group 1 instance 3 path-cost 1000