Msti Mapping - ORiNG RGS-R9004GP+ME-HV User Manual

Forward Delay
Max Age
Maximum Hop Count
Transmit Hold Count
Edge Port BPDU
Filtering
Edge Port BPDU
Guard
Port Error Recovery
Port Error Recovery
Timeout

4.4.2 MSTI Mapping

Since the recovery time of STP and RSTP takes seconds, which are unacceptable in some
industrial applications, MSTP was developed. The technology supports multiple spanning
trees within a network by grouping and mapping multiple VLANs into different spanning-tree
instances, known as MSTIs, to form individual MST regions. Each switch is assigned to an
MST region. Hence, each MST region consists of one or more MSTP switches with the same
VLANs, at least one MST instance, and the same MST region name. Therefore, switches can
use different paths in the network to effectively balance loads.
This page allows you to examine and change the configurations of current MSTI ports. A MSTI
port is a virtual port, which is instantiated separately for each active CIST (physical) port for
each MSTI instance configured and applicable for the port. The MSTI instance must be
ORing Industrial Networking Corp
The delay used by STP bridges to transit root and designated
ports to forwarding (used in STP compatible mode). The range of
valid values is 4 to 30 seconds.
The maximum time the information transmitted by the root bridge
is considered valid. The range of valid values is 6 to 40 seconds,
and Max Age must be <= (FwdDelay-1)*2.
This defines the initial value of remaining Hops for MSTI
information generated at the boundary of an MSTI region. It
defines how many bridges a root bridge can distribute its BPDU
information to. Valid values are in the range 6 to 40 hops.
The number of BPDUs a bridge port can send per second. When
exceeded, transmission of the next BPDU will be delayed. The
range of valid values is 1 to 10 BPDUs per second.
Control whether a port explicitly configured as Edge will transmit
and receive BPDUs.
Control whether a port explicitly configured as Edge will disable
itself upon reception of a BPDU. The port will enter the
error-disabled state, and will be removed from the active topology.
Control whether a port in the error-disabled state automatically
will be enabled after a certain time. If recovery is not enabled,
ports have to be disabled and re-enabled for normal STP
operation. The condition is also cleared by a system reboot.
The time to pass before a port in the error-disabled state can be
enabled. Valid values are between 30 and 86400 seconds (24
hours).
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