Configuring A Bridge - Brocade Communications Systems RFS6000 System Reference Manual

The following definitions describe the STP instances that define an MSTP configuration:
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To configure the switch for MSTP support, configure the region name and the revision on each
switch being configured. This region name is unique to each region. Then create one or more
instances and assign IDs. VLANs are then assigned to instances. These instances must be
configured on switches that interoperate with the same VLAN assignments. Port cost, priority, and
global parameters can then be configured for individual ports and instances.
The Multiple Spanning Tree option contains separate tabs for the following activities:
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Configuring a Bridge

Use the Bridge tab to configure the Bridge. This window displays bridge configuration details for the
switch
Brocade Mobility RFS4000, RFS6000, and RFS7000 System Reference Guide
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Common Spanning Tree (CST) – MSTP runs a single spanning tree instance (called the
Common Spanning Tree) that interconnects all the bridges in a network. This instance treats
each region as a single bridge. In all other ways, it operates exactly like Rapid Spanning Tree
(RSTP).
Common and Internal Spanning Trees (CIST) – CIST contains all of the ISTs and bridges not
formally configured into a region. This instance interoperates with bridges running legacy STP
and RSTP implementations.
Multiple Spanning Tree Instance (MSTI) – The MSTI is identified by an MSTP identifier (MSTPid)
value from 1 to 15. This defines an individual instance of a spanning tree. One or more VLANs
can be assigned to an MSTI. A VLAN cannot be assigned to multiple MSTIs. The multiple
spanning tree instance 0 is always present. VLANs not explicitly assigned to an instance are
assigned to instance 0.
MSTP Region – These are clusters of bridges that run multiple instances of the MSTP protocol.
Multiple bridges detect they are in the same region by exchanging their configuration digest
(which is dependent on the VLAN to instance mapping), region name, and revision-level. If you
need to have two bridges in the same region, the two bridges must have identical VLAN to
instance mappings, region names, and revision-levels.
Configuring a Bridge
Viewing and Configuring Bridge Instance Details
Configuring a Port
Viewing and Configuring Port Instance Details
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