Distributed Spanning Tree Commands
OmniSwitch 6250 CLI Reference Guide November 2009 page 16-55
bridge cist slot/port
Enables or disables the Spanning Tree status on a single port or an aggregate of ports for the flat mode
Common and Internal Spanning Tree (CIST) instance.
bridge cist {slot/port | logical_port} {enable | disable}
Syntax Definitions
slot/port The slot number for the module and the physical port number on that
module (e.g., 3/1 specifies port 1 on slot 3).
logical_port The Link aggregate ID number (0–31).
enable Enables Spanning Tree on the specified port for the CIST instance.
disable Disables Spanning Tree on the specified port for the CIST instance.
Defaults
By default, the Spanning Tree status is enabled on eligible ports.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• This command is an explicit Spanning Tree command that only applies to the port Spanning Tree
status for the flat mode CIST instance regardless of which operating mode (flat or 1x1) or protocol is
active on the switch.
• If the switch is running in 1x1 mode when this command is used, the Spanning Tree status configured
for the port is not active for the CIST instance until the operating mode for the switch is changed to the
flat mode.
• Note that when a configuration snapshot is taken of the switch, all Spanning Tree commands are saved
in their explicit format.
• When the Spanning Tree status is disabled on a port, the port is set to a forwarding state for the speci-
fied instance.
• If STP is disabled on a VLAN in the 1x1 mode, the port Spanning Tree status is ignored and all active
ports associated with the VLAN are put in a forwarding state and not included in the Spanning Tree
Algorithm. Note that ports at this point are not switching BPDU, unless the BPDU switching status for
the VLAN is enabled.
• Physical ports that are reserved for link aggregation do not participate in the Spanning Tree Algo-
rithm. Instead, the algorithm is applied to the aggregate logical link (virtual port) that represents a
collection of physical ports.
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