xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch CLI Reference Guide
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config stp mst_ports
Purpose
Used to update the port configuration for a MSTP instance.
Syntax config stp mst_ports <portlist> instance_id <value 0-15> {internalCost [auto | <value 1-
200000000>] priority <value 0-240>}(1)
Description This command will 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 0-15> − Enter a numerical value between 0 and 15 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. This value must be divisible by 16.
Restrictions
Only Administrator and Operator and Power-User-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:
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