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Alteon OS Command Reference
The Configuration Menu
22543W7774, May 2007
/cfg/l2/mrst/cist/port <port alias or number>
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, RSTP/MSTP is turned on by
default.
[CIST Port 1 Menu]
prior - Set port Priority (0-240)
cost - Set port Path Cost (1-200000000, 0 for auto)
hello - Set CIST port Hello Time (1-10 secs)
link - Set MSTP link type (auto, p2p, or shared; default: auto)
edge - Enable/disable edge port
on - Turn port's Spanning Tree ON
off - Turn port's Spanning Tree OFF
cur - Display current port Spanning Tree parameters
Table 6-36 CIST Port Configuration Menu Options (/cfg/l2/mrst/cist/port)
Command Syntax and Usage
prior <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 seg-
ment, 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.
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 Gigabit ports, 20000 for Gigabit ports.
hello <1-10 seconds>
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.
link <auto, p2p, or shared; default: auto>
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.