Configuring the TFA/TFR Pacing Rate

Note:

The pacing rate feature is not supported in ITU networks.

This procedure is used to configure the rate that the EAGLE sends the TFR and TFA messages, or the pacing rate. The pacing rate is configured with the tfatfrpr parameter of the chg-stpopts command. The value of the tfatfrpr parameter is from 0 to 1 second and can be set in 0.1 second intervals. When the chg-stpopts command is first introduced to the EAGLE, the default value for the tfatfrpr parameter is 1 second. A value of 0 for the tfatfrpr parameter indicates that the pacing should stop. The pacing of TFR/TCR is stopped and all remaining TFR/TCR are broadcast at once if the current alternate route used to route traffic to the affected point code is in danger of congestion. The value of the tfatfrpr parameter in the chg-stpopts command is entered and displayed in the rtrv-stpopts command output in milliseconds.

For this example, the TFA/TFR pacing rate is changed from 1 second to 0.5 seconds (1000 milliseconds to 500 milliseconds).

When the status of the route is changed to allowed (when the route was restricted) or restricted (when the route was prohibited), a burst of rerouted traffic can occur on that route, thus congesting the route. To help keep this from happening, the EAGLE can control the rate that it broadcasts TFR and TFA messages to adjacent signaling points. This can regulate the amount of traffic the adjacent signaling points can send to the EAGLE when the route becomes allowed or restricted.

The TFA/TCA and TFR/TCR messages for each affected point code are sent in groups of 20%. For each time period defined by the pacing rate, a group of 20% of the messages that are to be sent to the adjacent signaling points are broadcast to those signaling points.

This feature applies only to ANSI signaling links. The pacing is not done toward ITU networks.

If the destination becomes inaccessible or accessible before all of the TFR/TCR messages are broadcasted, then the remaining TFR/TCR messages are not sent.

TFA/TFC messages for multiple affected destinations are sent in parallel.

1. Display the existing values for the TFA/TFR pacing rate parameter by entering the rtrv-stpopts command. The value for the TFA/TFR pacing rate parameter is shown in the TFATFRPR field, and is shown in milliseconds. This is an example of the possible output.

   rlghncxa03w 06-10-17 16:02:05 GMT  EAGLE5 36.0.0
   STP OPTIONS
   -----------------------
   TFATFRPR          1000
   

   Note:

   The rtrv-stpopts command output contains other fields that are not used by this procedure. If you wish to see all the fields displayed by the rtrv-stpopts command, see the rtrv-stpopts command description in Commands User's Guide.
2. Change the TFA/TFR pacing rate parameter. For this example, enter this command.

   chg-stpopts:tfatfrpr=500

   When this command has successfully completed, this message should appear.

   rlghncxa03w 06-10-07 00:22:57 GMT  EAGLE5 36.0.0
   CHG-STPOPTS: MASP A - COMPLTD
   

3. Verify the changes using the rtrv-stpopts command. This is an example of the possible output.

   rlghncxa03w 06-10-17 16:02:05 GMT  EAGLE5 36.0.0
   STP OPTIONS
   -----------------------
   TFATFRPR           500
   

   Note:

   The rtrv-stpopts command output contains other fields that are not used by this procedure. If you wish to see all the fields displayed by the rtrv-stpopts command, see the rtrv-stpopts command description in Commands User's Guide.
4. Back up the new changes using the chg-db:action=backup:dest=fixed command. These messages should appear, the active Maintenance and Administration Subsystem Processor (MASP) appears first.

   BACKUP (FIXED) : MASP A - Backup starts on active MASP.
   BACKUP (FIXED) : MASP A - Backup on active MASP to fixed disk complete.
   BACKUP (FIXED) : MASP A - Backup starts on standby MASP.
   BACKUP (FIXED) : MASP A - Backup on standby MASP to fixed disk complete.
   

Figure 3-27 Configuring the TFA/TFR Pacing Rate