Cabletron Systems NB30, User Manual

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USING BRIDGE MANAGEMENT OPTIONS
5-47
Desig. Root:
Displays the unique bridge identifier of the bridge that is assumed to be
the root.
Max. Age:
Displays the maximum time protocol information will be kept before it is
discarded.
Hold Time:
Displays, in seconds, the minimum time period that elapses between the
transmission of configuration BPDUs through the bridge.
Forward Delay:
Displays the time period the bridges will spend in the listening state,
listening to BPDU activity on the network, while the bridge moves to the
learning state. The time displayed in this field also indicates the time
spent in the learning state, while the bridge moves from the listening to
the forwarding state.
Bridge Hello Time:
When the bridge is the root bridge, or is attempting to become the root,
the data in this field indicates the length of time the bridge waits between
sending configuration BPDUs. The default value for this field is 2
seconds.
Bridge Priority:
Displays the part of the bridge address that contains the identifier used in
Spanning Tree for priority comparisons. The default value for this field is
8000 when the Root Switch is off.
5.5.1.2 Editing the Bridge Protocol Parameters Screen
Fields
If you intend to change the Bridge Max Age, Bridge Forward Delay, or
the Bridge Hello Time fields, refer to Table 5-1, Optimal Bridge Max
Age Parameters. This table provides a range of values to which the
Bridge Max Age time field should be set, given allowable Bridge Max
Age or Bridge Forward Delay times. This will ensure that the NB30 will
operate effectively in a Spanning Tree Algorithm environment. For
example, if Bridge Forward Delay is set to 15 seconds and Bridge Hello
Time is set to 6 seconds, Bridge Max Age should be set to a value
between 14 and 28 seconds.