Chapter 4: Operation of Web-based Management
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There are three parameters, Auto, True, and False, used to configure the type of the point-to-point link. If you configure this
parameter to be Auto, it means RSTP will use the duplex mode resulting from the auto-negotiation. In today’s switched networks,
most links are running in full-duplex mode. The result may be half-duplex, in this case, the port will not fast transition to Forwarding
state. If it is set as True, the port is treated as point-to-point link by RSTP and unconditionally transitioned to Forwarding state. If it is
set as False, fast transition to Forwarding state will not happen on this port. Default: Auto
M Check: Migration Check. It forces the port sending out an RSTP BPDU instead of a legacy STP BPDU at the next transmission. The
only benefit of this operation is to make the port quickly get back to act as an RSTP port. Click on the
<M Check>
button to send a
RSTP BPDU from the port you specified.
4.15 MSTP
The implementation of MSTP is according to IEEE 802.1Q 2005 Clause 13—Multiple Spanning Tree Protocol. 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 MST Bridges. Proper configuration of MSTP in an 802.1Q VLAN
environment can ensure a loop-free data path for a group of VLANs within an MSTI. Redundant path and load balancing in a VLAN
environment is also achieved via this feature. .A spanning tree instance called CIST (Common and Internal Spanning Tree) always
exists. Up to 64 more spanning tree instances (MSTIs) can be provisioned.
4.15.1 Status
Function name: MSTP State
Function description: Enable or disable MSTP. Select a version of Spanning Tree MSTP operating protocol.
Figure 4-150. MSTP state.
Parameter description: Multiple Spanning Tree Protocol: Disabled / Enabled
Force Version: STP / RSTP / MSTP
4.15.2 Region Config
Function name: MSTP Region Config
Function description: Configures the basic identification of a MSTP bridge. Bridges participating in a common MST region must have
the same Region Name and Revision Level.
Figure 4-151. MSTP region configuration.