Nortel Networks 10BASE-T manual describes the Spanning Tree Switch Settings parameters

Using the Console Interface

Table 3-39 describes the Spanning Tree Switch Settings parameters.

Table 3-39. Spanning Tree Switch Settings Parameters

Parameter Description

Bridge Priority Indicates the management-assigned priority value of the bridge ID in hexadecimal notation, which is the most significant byte of the bridge ID. The STA uses this parameter to determine the root bridge (or designated bridge). For example, the bridge with the lowest bridge ID becomes the root bridge, with Bridge Priority values compared first, followed by the hardware addresses.

Designated Root

Root Port

Root Path Cost

Hello Time

Maximum Age Time

Default8000

Range 0 to 65535

Indicates the bridge ID of the root bridge, as determined by the STA.

Default	8000 (bridge_id)
Range	0 to 65535

Indicates the specific unit in a stack or standalone switch’s port number that offers the lowest path cost to the root bridge.

Default	Unit: 0 / Port: 0
Range	Unit: 0 to 8 / Port: 0 to 28

Indicates the path cost from this switch port to the root bridge.

Default0

Range Not applicable

Indicates the Actual Hello Interval, the amount of time between transmissions of configuration Bridge Protocol Data Units (BPDUs) that the root bridge is currently using.

Note that all bridges participating in the spanning tree network use the root bridge’s Hello Interval parameter value. See also Bridge Hello Time.

Default	2 seconds
Range	1 to 10 seconds

Indicates the Maximum Age Time parameter value that the root bridge is currently using. This value specifies the maximum age that a Hello message can attain before it is discarded.

Note that the root bridge’s Maximum Age Time parameter value becomes the actual Maximum Age Time parameter value for all bridges participating in the spanning tree network. See also Bridge Maximum Age Time.

Default	20 seconds
Range	6 to 40 seconds

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