Configuring STP Bridge Parameters Configuring Spanning Tree Parameters
page 7-18 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
To view current Spanning Tree bridge parameter values, use the bridge rrstp ring vlan-tag command.
For more information about this command, see the OmniSwitch CLI Reference Guide.
Bridge Configuration Commands Overview
Spanning Tree bridge commands are available in an implicit form and an explicit form. Implicit
commands resemble commands that were previously released with this feature. The type of instance
configured with these commands is determined by the Spanning Tree operating mode that is active at the
time the command is used. For example, if the 1x1 mode is active, the instance number specified with the
command implies a VLAN ID. If the flat mode is active, the single flat mode instance is implied and thus
configured by the command.
Explicit commands introduce three new keywords: cist, 1x1, and msti. Each of these keywords when used
with a bridge command explicitly identify the type of instance that the command will configure. As a
result, explicit commands only configure the type of instance identified by the explicit keyword, regard-
less of which mode (1x1 or flat) is active.
The cist keyword specifies the Common and Internal Spanning Tree (CIST) instance. The CIST is the
single Spanning Tree flat mode instance that is available on all switches. When using STP or RSTP, the
CIST is also known as instance 1 or bridge 1. When using MSTP (802.1s), the CIST is also known as
instance 0. In either case, an instance number is not required with cist commands, as there is only one
CIST instance.
The 1x1 keyword indicates that the instance number specified with the command is a VLAN ID. The msti
keyword indicates that the instance number specified with the command is an 802.1s Multiple Spanning
Tree Instance (MSTI).
Note that explicit commands using the cist and msti keywords are required to define an MSTP (802.1s)
configuration. Implicit commands are only allowed for defining STP or RSTP configurations. See
Chapter 2, “Using 802.1Q 2005 Multiple Spanning Tree,” for more information about these keywords and
using implicit and explicit commands.
The following is a summary of Spanning Tree bridge configuration commands. For more information
about these commands, see the OmniSwitch CLI Reference Guide.
Commands Type Used for ...
bridge protocol Implicit Configuring the protocol for a VLAN instance when the
1x1 mode is active or the single Spanning Tree instance
when the flat mode is active.
bridge cist protocol Explicit Configuring the protocol for the single flat mode instance.
bridge 1x1 protocol Explicit Configuring the protocol for a VLAN instance.
bridge priority Implicit Configuring the priority value for a VLAN instance or the
flat mode instance.
bridge cist priority Explicit Configuring the priority value for the single flat mode
instance.
bridge msti priority Explicit Configuring the protocol for an 802.1s Multiple Spanning
Tree Instance (MSTI).
bridge 1x1 priority Explicit Configuring the priority value for a VLAN instance.
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