Cambium Networks PTP 820 Series, Руководство пользователя

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Chapter 8: Ethernet Protocols Configuring MSTP
phn-3965_006v002
Page 8-21
Parameter Definition
STP Root Cost The cost of the path to the root as seen from this bridge.
STP Root Port The port number of the port that offers the lowest cost path from this
bridge to the external root bridge
STP Max Age The maximum age (in cs) of MSTP information learned from the network
on any port before the information is discarded.
Note: This field displays the value actually being used by the bridge, in
contrast to the STP Bridge Max Age parameter described below, which is
user-configurable and which represents the value that this and all other
bridges use if and when this bridge becomes the root.
STP Forward Delay The speed at which ports change their spanning state when moving
towards the Forwarding state. This value determines how long the port
stays in Listening state and Learning state. This value is also used when a
topology change has been detected and is underway for purposes of
aging all dynamic entries in the filtering database.
Note: This field displays the value actually being used by the bridge, in
contrast to the STP Bridge Forward Delay parameter described below,
which is user-configurable and which represents the value that this and
all other bridges use if and when this bridge becomes the root.
STP Version The STP version the bridge is currently running (MSTP).
Table 78 MSTP Bridge Spanning Tree Configuration Parameters
Parameter Definition
STP Priority Select a value as the writeable portion of the Bridge ID. This value
constitutes the first two octets of the Bridge ID. Possible values are 0-
61440, in steps of 4096
STP Hold Time Select a value (in cs) as the interval length during which no more than two
configuration bridge PDUs will be transmitted by this node. Possible
values are 10-100.
STP Bridge Max Age Select a value (in cs) that all bridges will use, when this bridge is the root,
as the maximum age of MSTP information learned from the network on
any port before the information is discarded. Options are 600-4000 cs.
STP Bridge Forward Delay Select a value (in cs) that all bridges will use, when this bridge is the root,
as the speed at which ports change their spanning state when moving
towards the Forwarding state. This value determines how long the port
stays in Listening state and Learning state. This value is also used when a
topology change has been detected and is underway for purposes of
aging all dynamic entries in the filtering database. Options are 400-3000
cs.