Technical data

BLADE OS 5.0 Command Reference
232
 Chapter 6: The Configuration Menu BMD00142, November 2009
The port option of STG is turned on by default.
Table 127 Spanning Tree Port Options
Command Syntax and Usage
prior <new port Priority (0-255)>
Configures the port priority. The port priority helps determine which bridge port becomes the
designated port. In a network topology that has multiple bridge ports connected to a single
segment, the port with the lowest port priority becomes the designated port for the segment.
The default value is 128.
RSTP/MSTP: The range is 0 to 240, in steps of 16 (0, 16, 32...) and the default is 128.
cost <1-65535, 0 for default)>
Configures the port path cost. The port path cost is used to help determine the designated port
for a segment. Port path cost is based on the port speed, and is calculated as follows:
 1Gbps = 4
 10Gbps = 2
The default value of 0 (zero) indicates that the default path cost will be computed for an auto
negotiated link speed.
link [auto|p2p|shared]
Defines the type of link connected to the port, as follows:
 auto: Configures the port to detect the link type, and automatically match its settings.
 p2p: Configures the port for Point-To-Point protocol.
 shared: Configures the port to connect to a shared medium (usually a hub).
The default link type is auto.
fastfwd enable|disable
Disables or enables Port Fast Forwarding, which permits a port that participates in Spanning
Tree to bypass the Listening and Learning states and enter directly into the Forwarding state.
While in the Forwarding state, the port listens to the BPDUs to learn if there is a loop and, if
dictated by normal STG behavior (following priorities, etc.), the port transitions into the
Blocking state. This feature permits the switch to interoperate well within Rapid Spanning
Tree networks.
The default setting is disabled.
on
Enables STG on the port.