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Netgear GS108Tv2 Manual

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GS108T and GS110TP Smart Switch Software Administration Manual
B-16 Configuration Examples
v1.0, April 2010
The MSTP algorithm and protocol provides simple and full connectivity for frames assigned to
any given VLAN throughout a Bridged LAN comprising arbitrarily interconnected networking
devices, each operating MSTP, STP or RSTP. MSTP allows frames assigned to different VLANs
to follow separate paths, each based on an independent Multiple Spanning Tree Instance (MSTI),
within Multiple Spanning Tree (MST) Regions composed of LANs and or MSTP Bridges. These
Regions and the other Bridges and LANs are connected into a single Common Spanning Tree
(CST). [IEEE DRAFT P802.1s/D13]
MSTP connects all Bridges and LANs with a single Common and Internal Spanning Tree (CIST).
The CIST supports the automatic determination of each MST region, choosing its maximum
possible extent. The connectivity calculated for the CIST provides the CST for interconnecting
these Regions, and an Internal Spanning Tree (IST) within each Region. MSTP ensures that
frames with a given VLAN ID are assigned to one and only one of the MSTIs or the IST within the
Region, that the assignment is consistent among all the networking devices in the Region and that
the stable connectivity of each MSTI and IST at the boundary of the Region matches that of the
CST. The stable active topology of the Bridged LAN with respect to frames consistently classified
as belonging to any given VLAN thus simply and fully connects all LANs and networking devices
throughout the network, though frames belonging to different VLANs can take different paths
within any Region, per IEEE DRAFT P802.1s/D13.
All bridges, whether they use STP, RSTP or MSTP, send information in configuration messages
via Bridge Protocol Data Units (BPDUs) to assign port roles that determine each port’s
participation in a fully and simply connected active topology based on one or more spanning trees.
The information communicated is known as the spanning tree priority vector. The BPDU structure
for each of these different protocols is different. A MSTP bridge will transmit the appropriate
BPDU depending on the received type of BPDU from a particular port.
An MST Region comprises of one or more MSTP Bridges with the same MST Configuration
Identifier, using the same MSTIs, and which have no Bridges attached that cannot receive and
transmit MSTP BPDUs. The MST Configuration Identifier has the following components:
1. Configuration Identifier Format Selector
2. Configuration Name
3. Configuration Revision Level
4. Configuration Digest: 16-byte signature of type HMAC-MD5 created from the MST
Configuration Table (a VLAN ID to MSTID mapping)
As there are Multiple Instances of Spanning Tree, there is a MSTP state maintained on a per-port,
per-instance basis (or on a per port per VLAN basis: as any VLAN can be in one and only one
MSTI or CIST). For example, port A can be forwarding for instance 1 while discarding for
instance 2. The port states have changed since IEEE 802.1D specification.
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