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Configuring Spanning Tree Parameters
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
spantree cist
spantree vlan
spantree priority
spantree cist path-cost
spantree msti path-cost
spantree vlan path-cost
spantree cist mode
spantree vlan mode
spantree cist connection
spantree vlan connection
spantree cist admin-edge
spantree vlan admin-edge
OmniSwitch AOS Release 7 Network Configuration Guide
Used for ...
Configuring the port Spanning Tree status for the single flat mode
instance.
Configuring the port Spanning Tree status for a VLAN instance.
Configuring the priority value for the flat mode CIST instance, a
Multiple Spanning Tree Instance (MSTI), or a per-VLAN mode
VLAN instance.
Configuring the port path cost value for the single flat mode
instance.
Configuring the port path cost value for a Multiple Spanning Tree
Instance (MSTI).
Configuring the port path cost value for a VLAN instance.
Configuring the port Spanning Tree mode (dynamic or manual) for
the single flat mode instance.
Configuring the port Spanning Tree mode (dynamic or manual) for
a VLAN instance.
Configuring the port connection type for the single flat mode
instance.
Configuring the port connection type for a VLAN instance.
Configures the connection type for a port or an aggregate of ports
for the flat mode Common and Internal Spanning Tree (CIST).
Configures the connection type for a port or an aggregate of ports
for a per-VLAN mode VLAN instance.
March 2011
Configuring STP Port Parameters
page 5-33
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