3Com 3C780 User Guide - Page 94

Using Station Management Parameters

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Setting Up the Hub 4-7 Using Station Management Parameters The hub supports a number of station management (SMT) parameters to help you understand and manage the processes occurring in the FDDI ring. You can set and display three of these parameters. You can display three other parameters, but you cannot set them. Setting SMT Parameters Using the console interface, you can display and change these SMT parameters: s Neighbor Notification Timer (T-Notify) s Target Rotation Time (T-Req) s Link Error Rate (LER) alarm and cutoff values Neighbor Notification Timer (T-Notify) The T-Notify parameter functions as one element of the Neighbor Notification protocol. This protocol allows a MAC to determine the address of its logical upstream and downstream neighbors. The Neighbor Notification process is performed independently for each MAC in a station. The process facilitates the detection of, isolation of, and recovery from network errors by supplying each MAC with logical fault information. The protocol performs these functions by periodically initiating a requestresponse frame exchange between a MAC and its nearest downstream neighbor. The T-Notify parameter determines how frequently Neighbor Information Frames (NIFs) are broadcast to the ring. The T-Notify parameter is stored in nonvolatile RAM. You can set it using the set tnotify command. The factory-set default for T-Notify is 30 seconds, but it can be set in the range of 2 to 30 seconds. A change to T-Notify takes effect immediately. To show the current value of T-Notify, enter the show tnotify command. A display similar to the following appears: T-Notify = 20 seconds

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4-7
Setting Up the Hub
Using Station Management Parameters
The hub supports a number of station management (SMT) parameters to help
you understand and manage the processes occurring in the FDDI ring.
You can
set and display three of these parameters.
You can display three other
parameters, but you cannot set them.
Setting SMT Parameters
Using the console interface, you can display and change these SMT parameters:
■
Neighbor Notification Timer (T-Notify)
■
Target Rotation Time (T-Req)
■
Link Error Rate (LER) alarm and cutoff values
Neighbor Notification Timer (T-Notify)
The T-Notify parameter functions as one element of the Neighbor Notification
protocol.
This protocol allows a MAC to determine the address of its logical
upstream and downstream neighbors.
The Neighbor Notification process is
performed independently for each MAC in a station.
The process facilitates the
detection of, isolation of, and recovery from network errors by supplying each
MAC with logical fault information.
The protocol performs these functions by periodically initiating a request-
response frame exchange between a MAC and its nearest downstream neighbor.
The T-Notify parameter determines how frequently Neighbor Information
Frames (NIFs) are broadcast to the ring.
The T-Notify parameter is stored in nonvolatile RAM.
You can set it using the
set tnotify
command.
The factory-set default for T-Notify is 30 seconds, but it
can be set in the range of 2 to 30 seconds.
A change to T-Notify takes effect
immediately.
To show the current value of T-Notify, enter the
show tnotify
command.
A
display similar to the following appears:
T-Notify = 20 seconds