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xStack® DES-3200 Series Layer 2 Ethernet Managed Switch CLI Reference Guide
109
config stp mst_ports
Purpose
Used to update the port configuration for a MSTP instance.
Syntax
config stp mst_ports <portlist> instance_id <value 0-8> {internalCost [auto | <value 1-
200000000>] | priority <value 0-240>} (1)
Description
This command is used to update the port configuration for a STP instance_id. If a loop occurs,
the MSTP function will use the port priority to select an interface to put into the forwarding state.
Set a higher priority value for interfaces to be selected for forwarding first. In instances where
the priority value is identical, the MSTP function will implement the lowest MAC address into the
forwarding state and other interfaces will be blocked. Remember that lower priority values
mean higher priorities for forwarding packets.
Parameters
<portlist> − Specifies a port or range of ports to be configured.
instance_id <value 0-8> − Enter a numerical value between 0 and 8 to identify the instance_id
previously configured on the Switch. An entry of 0 will denote the CIST (Common and Internal
Spanning Tree).
internalCost – This parameter is set to represent the relative cost of forwarding packets to
specified ports when an interface is selected within a STP instance. The default setting is auto.
There are two options:
auto – Selecting this parameter for the internalCost will set quickest route automatically and
optimally for an interface. The default value is derived from the media speed of the interface.
value 1-200000000 – Selecting this parameter with a value in the range of 1-200000000 will set
the quickest route when a loop occurs. A lower internalCost represents a quicker transmission.
priority <value 0-240> − Enter a value between 0 and 240 to set the priority for the port
interface. A higher priority will designate the interface to forward packets first. A lower number
denotes a higher priority.
Restrictions
Only Administrator-level users can issue this command.
Example usage:
To designate ports 1 through 5, with instance id 2, to have an auto internalCost and a priority of 16:
DES-3200-28:4#config stp mst_ports 1-5 instance_id 2 internalCost auto priority 16
Command : config stp mst_ports 1-5 instance_id 2 internalCost auto priority 16
Success.
DES-3200-28:4#