Distributed Spanning Tree Commands
OmniSwitch 6250 CLI Reference Guide November 2009 page 16-97
bridge cist slot/port auto-edge
Configures whether or not Spanning Tree automatically determines the operational edge port status of a
port or an aggregate of ports for the flat mode Common and Internal Spanning Tree (CIST).
bridge cist {slot/port | logical_port} auto-edge {on | off | enable | disable}
Syntax Definitions
slot/port Enter 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 Link aggregate ID number (0–31).
on Spanning Tree automatically determines edge port status.
off Spanning Tree does not automatically determine edge port status.
enable Spanning Tree automatically determines edge port status.
disable Spanning Tree does not automatically determine edge port status.
Defaults
By default, automatic edge port status configuration is enabled (on).
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• This command is an explicit Spanning Tree command that only applies to the CIST instance regard-
less of which operating mode (flat or 1x1) is active on the switch.
• If the switch is running in the 1x1 mode when this command is used, the specified edge port status for
the port is not active for the CIST instance until the switch is running in the flat Spanning Tree mode.
• Note that when a configuration snapshot is taken of the switch, all Spanning Tree commands are saved
in their explicit format.
• The administrative edge port status is used to determine if a port is an edge or non-edge port when
automatic edge port configuration (auto-edge) is disabled for the port. However, if auto-edge is
enabled for the port, then the administrative status is overridden.
• Rapid transition of a designated port to forwarding can only occur if the port’s connection type is
defined as point to point or an edge port. Rapid transition of an alternate port role to a root port role is
not affected by the port connection type definition.
• Configure ports that will connect to a host (PC, workstation, server, etc.) as edge ports to avoid unnec-
essary topology changes when these ports go active. This will also prevent the flushing of learned
MAC addresses on these ports if a topology change occurs as a result of another non-edge port going
active. If an edge port receives a BPDU, it will operationally revert back to a no point to point connec-
tion type.
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