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Important Points To Remember; Mst Regions; Mst Interactions; Mstp Standards - Dell Force10 S2410-01-10GE-24P Configuration Manual

Sftos configuration guide
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Important Points to Remember

MSTP is part of the SFTOS switching package. Either IEEE 802.1D or IEEE 802.1s operates at any given
time. The following is the SFTOS implementation of MSTP:
•
MSTP instances can only exist within a region.
•
One Common Instance (CIST) and 32 additional Multiple Instances (MSTIs) are supported.
•
Each port supports multiple STP states, with one state per instance. Thus, a port can be in the
forwarding state in one instance and blocking in another instance.
•
MSTP BPDUs appear as normal BPDUs for the CIST while including information for the MSTIs (one
record for each MSTP Instance). The CIST is mapped to Instance 0.
•
VLANs are associated with one and only one instance of STP.
•
Multiple VLANs can be associated with an STP instance.
•
The overall root bridge for 802.1s is calculated in the same way as for 802.1D or 802.1w.
•
IEEE 802.1s bridges can interoperate with IEEE 802.1D and IEEE 802.1w bridges

MST Regions

A Multiple Spanning Tree region is a collection of MST bridges that share the same VLAN-to-STP
instance mappings. They are administratively configured on each MST Bridge in the network.
MST regions are identified by:
•
32-byte alphanumeric configuration name
•
Two-byte configuration revision number
•
The mapping of VLAN IDs to STP instance numbers

MST Interactions

Bridge Protocol Data Units (BPDU) considerations:
•
MSTP instances can only exist within in a region
•
MSTP instances never interact outside a region
•
MSTP BPDUs appear as normal BPDUs for the CIST while including information for the MSTIs (one
record for each MSTP Instance)
•
The CIST is mapped to Instance 0
•
Both ends of a link may send BPDUs at the same time, as they may be the designated ports for
different instances

MSTP Standards

•
Conforms to IEEE 802.1s
•
Compatible with IEEE 802.1w and IEEE 802.1D
•
SNMP management via a private MIB, as no standard MIB exists
Spanning Tree | 149

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