Technical data

BLADEOS 6.3 Command Reference
BMD00186-B, April 2010 Chapter 4: Configuration Commands
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CIST Port Configuration
CIST port parameters are used to modify MSTP operation on an individual port basis. CIST
parameters do not affect operation of STP/PVST+. For each port, RSTP/MSTP is turned on by
default.
Table 161 CIST Port Configuration Commands
Command Syntax and Usage
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. Port path cost is based on the port speed, and is calculated as
follows:
 1Gbps = 20000
 10Gbps = 2000
The default value of 0 (zero) indicates that the default path cost will be computed for an auto
negotiated link speed.
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
[no] spanning-tree mstp cist pvst-protection
Configures PVST Protection on the selected port. If the port receives any PVST+/PVRST+
BPDUs, it error disabled. PVST Protection works only in MSTP mode. The default setting is
enabled.
Command mode: Interface port