Distributed Spanning Tree Commands
page 16-6 OmniSwitch 6250 CLI Reference Guide November 2009
bridge protocol
Configures the Spanning Tree protocol for the flat mode Common and Internal Spanning Tree (CIST)
instance or for an individual VLAN instance if the switch is running in the 1x1 mode.
bridge [instance] protocol {stp | rstp | mstp}
Syntax Definitions
instance The flat mode CIST instance (1) or an existing 1x1 mode VLAN ID
instance number (bridge 1–4094).
stp IEEE 802.1D standard Spanning Tree Algorithm and Protocol.
rstp IEEE 802.1W Rapid Spanning Tree Protocol.
mstp IEEE 802.1Q 2005 Multiple Spanning Tree Protocol.
Defaults
RSTP is the default protocol for the flat mode CIST instance and for the 1x1 mode VLAN instance.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• Specifying an instance number with this command when the switch is running in the 1x1 Spanning
Tree mode implies a VLAN ID and configures the protocol for the associated VLAN instance.
• To configure the protocol for the flat mode CIST instance when the switch is running in either the flat
or 1x1 mode, do not specify an instance number. The CIST is the instance configured by default with
this command.
• If the switch is running in the flat mode and STP or RSTP is the active protocol, entering 1 to specify
the CIST instance is optional. If MSTP is the active protocol, however, entering 1 for the instance
number is not accepted.
• Note that selecting MSTP is only an option for the flat mode CIST instance and is required to config-
ure Multiple Spanning Tree Instances (MSTI).
• MSTP is only active when the switch is operating in the flat Spanning Tree mode. STP and RSTP are
active when the switch is operating in either the flat or 1x1 Spanning Tree mode.
• Deleting all existing MSTIs is required before changing the protocol from MSTP to STP or RSTP.
parameter default
instance flat mode instance
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