Command Reference Guide

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CIST port configuration
CIST port parameters are used to modify MRST operation on an individual port basis. CIST parameters do
not affect operation of STP/PVST+.
For each port, CIST is turned on by default. Port parameters include:
Port priority
Port path cost
Port Hello time
Link type
Edge
On and off
Current port configuration
The port option of MRST is turned on by default.
The following table describes the commands used to configure CIST Port Configuration commands.
Table 108 CIST Port Configuration commands
Command
Description
spanning-tree mstp cist
interface-priority <0-240>
Configures the CIST 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 240, in steps
of 16 (0, 16, 32...), and the default is 128.
Command mode: Interface port
spanning-tree mstp cist path-
cost <0-200000000>
Configures the CIST 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 2000 for 10 Gb ports.
Command mode: Interface port
spanning-tree mstp cist hello
<1-10>
Configures the CIST port Hello time. The Hello time specifies how
often the root bridge transmits a configuration bridge protocol
data unit (BPDU). Any bridge that is not the root bridge uses the
root bridge Hello value. The range is 1 to 10 seconds, and the
default is 2 seconds.
Command mode: Interface port
spanning-tree mstp cist link-
type {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).
The default link type is auto.
Command mode: Interface port
[no] spanning-tree mst cist
edge
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.
Command mode: Interface port
spanning-tree mst cist enable
Enables CIST on the port. Ports 18-21 are enabled by default.
Command mode: Interface port
no spanning-tree mst cist
enable
Disables CIST on the port.
Command mode: Interface port
show interface port <port
number> spanning-tree mstp cist
Displays the current CIST port configuration.
Command mode: All