N8406-023 1Gb Intelligent L3 Switch Command Reference Guide (ISCLI) 106
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 20000 for Gigabit
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 17-18 and 20-24 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 gigabitethernet
<port number
>
spanning-tree
mstp cist
Displays the current CIST port configuration.
Command mode
: All