Configuring Spanning Tree Parameters Configuring STP Port Parameters
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 6-33
Configuring STP Port Parameters
The following sections provide information and procedures for using CLI commands to configure STP
port parameters. These parameters determine the behavior of a port for a specific Spanning Tree instance.
When a switch is running in the per-VLAN STP mode, each VLAN is in essence a virtual STP bridge with
its own STP instance and configurable parameters. To change STP port parameters while running in this
mode, a VLAN ID is specified to identify the VLAN STP instance associated with the specified port.
When a switch is running in the flat Spanning Tree mode, VLAN 1 is specified for the VLAN ID.
Only bridged ports participate in the Spanning Tree Algorithm. A port is considered bridged if it meets all
the following criteria:
• Port is either a fixed (non-mobile) port, an 802.1Q tagged port, or a link aggregate logical port.
• Spanning tree is enabled on the port.
• Port is assigned to a VLAN that has Spanning Tree enabled.
• Port state (forwarding or blocking) is dynamically determined by the Spanning Tree Algorithm, not
manually set.
The following is a summary of Spanning Tree port configuration commands. For more information about
these commands, see the OmniSwitch CLI Reference Guide.
Commands Used for ...
spantree cist Configuring the port Spanning Tree status for the single flat mode
instance.
spantree vlan Configuring the port Spanning Tree status for a VLAN instance.
spantree priority Configuring the priority value for the flat mode CIST instance, a
Multiple Spanning Tree Instance (MSTI), or a per-VLAN mode
VLAN instance.
spantree cist path-cost Configuring the port path cost value for the single flat mode
instance.
spantree msti path-cost Configuring the port path cost value for a Multiple Spanning Tree
Instance (MSTI).
spantree vlan path-cost Configuring the port path cost value for a VLAN instance.
spantree cist mode Configuring the port Spanning Tree mode (dynamic or manual) for
the single flat mode instance.
spantree vlan mode Configuring the port Spanning Tree mode (dynamic or manual) for
a VLAN instance.
spantree cist connection Configuring the port connection type for the single flat mode
instance.
spantree vlan connection Configuring the port connection type for a VLAN instance.
spantree cist admin-edge Configures the connection type for a port or an aggregate of ports
for the flat mode Common and Internal Spanning Tree (CIST).
spantree vlan admin-edge Configures the connection type for a port or an aggregate of ports
for a per-VLAN mode VLAN instance.
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