Changing SCCP Class 1 Sequencing Option

This procedure is used to change the option for sequencing UDT/XUDT Class 1 messages using the chg-sccpopts command and the class1seq parameter. The class1seq parameter has two values on and off.

When the class1seq parameter value is on, UDT/XUDT Class 1 messages are delivered to the remote node in the order in which they were received (in sequence). Load sharing of these messages is performed in the dominant mode, overriding the load sharing configuration in the MAP and MRN tables.

Delivering the UDT/XUDT Class 1 ITU messages in sequence is guaranteed only if the randsls parameter value of the chg-stpopts command is either off or class0. If you wish to guarantee delivering these messages in sequence, the class1seq=on and the randsls=all parameters should not be used together in the EAGLE. The value of the randsls parameter is shown in the rtrv-stpopts command.

When the class1seq parameter value is off, load sharing of the UDT/XUDT Class 1 messages is performed using the load sharing configuration in the MAP and MRN tables. The delivery of the UDT/XUDT Class 1 messages in sequence is not guaranteed.

1. Display the existing value for the class1seq parameter by entering the rtrv-sccpopts command. This is an example of the possible output.

   rlghncxa03w 07-05-17 16:02:05 GMT  EAGLE5 37.0.0
   SCCP OPTIONS
   -------------------------------
   CLASS1SEQ                   off
   DFLTGTTMODE                CdPA

2. Verify the value of the randsls parameter of the chg-stpopts command by entering the rtrv-stpopts command.

   Note:

   If the class1seq parameter value in step 1 is on, skip step 2 and 3, and go to step 4.

   This is an example of the possible output.

   rlghncxa03w 07-05-17 16:02:05 GMT  EAGLE5 37.0.0
   STP OPTIONS
   -----------------------
   RANDSLS          class0

   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, refer to the rtrv-stpopts command description in Commands User's Guide.

   Delivering the UDT/XUDT Class 1 ITU messages in sequence is guaranteed only if the randsls parameter value of the chg-stpopts command is either off or class0 and if the class1seq parameter value is on. If you wish to guarantee delivering these messages in sequence, the class1seq=on and the randsls=all parameters should not be used together in the EAGLE.

3. Change the randsls parameter value to either off or class0. Refer to the “Configuring the EAGLE for Random SLS Generation” procedure in Database Administration - SS7 User's Guide for more information on using the off and class0 options. For this example, enter this command.

   Note:

   If the randsls parameter value shown in step 2 is either off or class0, or if you wish to use the randsls=all parameter and the class1seq=on parameters, skip step 3 and go to step 4.

   chg-stpopts:randsls=class0

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

   rlghncxa03w 07-05-07 00:22:57 GMT  EAGLE5 37.0.0
   CHG-STPOPTS: MASP A - COMPLTD

4. Change the class1seq parameter value.

   If you wish to enable the sequencing of UDT/XUDT Class 1 messages, enter this command.

   chg-sccpopts:class1seq=on

   If you wish to disable the sequencing of UDT/XUDT Class 1 messages, enter this command.

   chg-sccpopts:class1seq=off

   When the chg-sccpopts command has successfully completed, this message should appear.

   rlghncxa03w 07-05-07 00:22:57 GMT  EAGLE5 37.0.0
   CHG-SCCPOPTS: MASP A - COMPLTD

5. Verify the changes using the rtrv-sccpopts command. This is an example of the possible output.

   rlghncxa03w 07-05-17 16:02:05 GMT  EAGLE5 37.0.0
   
   SCCP OPTIONS
   -------------------------------
   CLASS1SEQ                    on
   DFLTGTTMODE                CdPA

6. 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 2-167 Change SCCP Class 1 Sequencing Option - Sheet 1 of 2

Figure 2-168 Change SCCP Class 1 Sequencing Option - Sheet 2 of 2