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Alteon OS Command Reference
The Configuration Menu
23143W7774, May 2007
/cfg/l2/stg <STP Group number>/port <port alias or
number>
Spanning Tree Port Configuration
By default for STP/PVST+, Spanning Tree is turned Off for internal ports and management
ports, and turned On for external ports. By default for RSTP/MSTP, Spanning Tree is turned
Off for internal ports and management ports, and turned On for external ports, with internal
ports configured as Edge ports. STG port parameters include:
Port priority
Port path cost
The port option of STG is turned on by default.
[Spanning Tree Port EXT1 Menu]
prior - Set port Priority (0-255)
cost - Set port Path Cost (1-65535 (802.1d) /
1-200000000 (MSTP/RSTP) /0 for auto)
link - Set port link type (auto, p2p, or shared; default: auto)
edge - Enable/disable edge port
on - Turn port's Spanning Tree ON
off - Turn port's Spanning Tree OFF
cur - Display current port Spanning Tree parameters
Table 6-39 Spanning Tree Port Menu Options (/cfg/l2/stg/port)
Command Syntax and Usage
prior <new port Priority (0-255)>
Configures the port priority. The port priority helps determine which bridge port becomes the des-
ignated 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 <new port Path 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. Generally speaking, the faster the port, the lower the path cost. The default is 19 for
100Mbps ports, 4 for 1Gb ports and 2000 for 10 Gb ports. A value of 0 (zero) indicates that the
default cost will be computed for an auto negotiated link speed.
link <auto, p2p, or shared; default: auto>
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).