Mstp Example Configuration; V1.0, July - NETGEAR GS724Tv3 - ProSafe Gigabit Managed Switch Admin Manual

GS716Tv2 and GS724Tv3 Software Administration Manual
To support multiple spanning trees, a MSTP bridge has to 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 may 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.

MSTP Example Configuration

This example shows how to create an MSTP instance from the GS716T/GS724T switch. The
example network has three different GS716T/GS724T switches that serve different locations in the
network. In this example, ports g1–g5 are connected to host stations, so those links are not subject
to network loops. Ports g6-g10 are connected across switches 1, 2 and 3.
Configuration Examples B-13

v1.0, July 2009