Bedienungsanleitung Netgear GSM4210P (Seite 692 von 700) (Englisch)

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Configuration Examples

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M4200 and M4300 Series ProSAFE Managed Switches Web Management User Manual

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 through 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 without any 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 changed since IEEE 802.1D specification.

To support multiple spanning trees, a MSTP bridge must be configured with an unambiguous

assignment of VLAN IDs (VIDs) to spanning trees. This is achieved by:

1. Ensuring that the allocation of VIDs to FIDs is unambiguous.

2. Ensuring that each FID supported by the Bridge is allocated to exactly one Spanning Tree

Instance.

The combination of VID to FID and then FID to MSTI allocation defines a mapping of VIDs to

spanning tree instances, represented by the MST Configuration Table.

With this allocation we ensure that every VLAN is assigned to one and only one MSTI. The

CIST is also an instance of spanning tree with a MSTID of 0.

An instance might occur that has no VIDs allocated to it, but every VLAN must be allocated to

one of the other instances of spanning tree.

The portion of the active topology of the network that connects any two bridges in the same

MST Region traverses only MST bridges and LANs in that region, and never Bridges of any

kind outside the Region, in other words connectivity within the region is independent of

external connectivity.

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