Configuring Spanning Tree Parameters Configuring STP Port Parameters
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 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 AOS Release 8 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 loop-guard Enables or disables the STP loop-guard on a port or link aggregate.
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 loop-guard 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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