RGS-PR9000 Series User Manual
ORing Industrial Networking Corp
32
4.4.3 CIST
With the ability to cross regional boundaries, CIST is used by MSTP to communicate with other
MSTP regions and with any RSTP and STP single-instance spanning trees in the network. Any
boundary port, that is, if it is connected to another region, will automatically belongs solely to
CIST, even if it is assigned to an MSTI. All VLANs that are not members of particular MSTIs
are members of the CIST.
Port Settings
Label
Description
Port
The switch port number to which the following settings will be
applied.
STP Enabled
Check to enable STP for the port
Path Cost
Configures the path cost incurred by the port.
Auto
will set the
path cost according to the physical link speed by using the
802.1D-recommended values.
Specific
allows you to enter a
user-defined value. The path cost is used when establishing an
active topology for the network. Lower path cost ports are chosen
as forwarding ports in favor of higher path cost ports. The range of
valid values is 1 to 200000000.
Priority
Configures the priority for ports having identical port costs. (See
above).
OpenEdge (setate
flag)
A flag indicating whether the port is connected directly to edge
devices or not (no bridges attached). Transiting to the forwarding
state is faster for edge ports (
operEdge
set to true) than other
ports.
AdminEdge
Configures the operEdge flag to start as set or cleared.(the initial
