Command Reference Guide

N8406-023 1Gb Intelligent L3 Switch Command Reference Guide (AOS) 112
Spanning Tree port configuration
Command: /cfg/l2/stp <STG number>/port <port number>
[Spanning Tree Port 1 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 - Enables or disables this port as an edge port
fastfwd - Enable/disable Port Fast Forwarding mode
on - Turn port's Spanning Tree ON
off - Turn port's Spanning Tree OFF
cur - Display current port Spanning Tree parameters
By default for STP/PVST+, Spanning tree is turned Off for downlink ports (1-16), and turned On for cross-connect
ports (17-18), and uplink ports (20-24). By default for RSTP/MSTP, Spanning tree is turned Off for all downlink
ports (1-16) configured as Edge ports, and turned On for cross-connect ports (17-18) and all uplink ports (20-24).
Spanning tree port parameters are used to modify STP operation on an individual port basis. STP port parameters
include:
Port priority
Port path cost
The following table describes the Spanning Tree Port Configuration Menu options.
Table 113 Spanning Tree Port Configuration Menu options
Command
Description
prior <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 range is 0 to 255, and the default is 128.
RSTP/MSTP: The range is 0 to 240, in steps of 16 (0, 16, 32...) and the default is
128.
cost <0-200000000>
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 range is 0 to 65535. The default is 4 for Gigabit ports except Port 19. A value
of 0 indicates that the default cost will be computed for an auto-negotiated link
speed. The default cost is 19 for 100Mb/s ports and 4 for Gigabit ports.
RSTP/MSTP: The range is 0 – 200000000, and the default is 20000 for Gigabit
ports except Port 19.
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).
This command only applies when RSTP is turned on. See the ―Common Internal
Spanning Tree configuration‖ section for more information.
edge disable|enable
Enables or disables this port as an edge port. An edge port is not connected to a
bridge, and can begin forwarding traffic as soon as the link is up. Configure server
ports as edge ports (enabled). By default, Ports 1-16 are configured as edge
ports.
This command only applies when RSTP is turned on. See the ―Common Internal
Spanning Tree configuration‖ section for more information.
fastfwd disable|enable
Enables or disables Port Fast Forward on the port. The default is disabled.
on
Enables STP on the port. This is the default for Ports 17-18 and 20-24.
off
Disables STP on the port.
cur
Displays the current STP port parameters.