NETGEAR M4350-24F4V 24-Port 10G SFP+ Managed AV Network Switch - Manual (Page 924)

of Topology Change Notification. These features are represented by the parameters
pointtopoint and edgeport. MSTP is compatible with both RSTP and STP. It behaves in
a way that is appropriate for STP and RSTP bridges.
An MSTP bridge can be configured to behave entirely as an RSTP bridge or an STP
bridge. So, an IEEE 802.1s bridge inherently also supports IEEE 802.1w and IEEE 802.1D.
The MSTP algorithm and protocol provide simple and full connectivity for frames
assigned to any VLAN throughout a bridged LAN comprising arbitrarily interconnected
networking devices, each operating with 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 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.
MSTP ensures the following:
• frames with a VLAN ID are assigned to one and only one of the MSTIs or the IST
within the region
• the assignment is consistent among all the networking devices in the region
• 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 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. An
MSTP bridge transmits 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
Main User Manual 924 Configuration Examples
Fully Managed Switches M4350 Series Main User Manual