Optical Systems Design OSD2700SFP SERIES Operator's Manual page 164

2. Usage:
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
switch_a(config-if)#
PAGE 164
OSD2700SFP OPERATOR MANUAL
OPTICAL SYSTEMS DESIGN
DOC ID: 10112704