Changing Remote Loopback Points

This procedure is used to change the values of the remote loopback points to be used by the link fault sectionalization feature in the database, using the chg-lbp command. The chg-lbp command uses these parameters.

:loc – The card location of the signaling link to be tested.

:link – The signaling link on the card specified in the loc parameter.

:lbp – Identifies the far-end loopback point that lies along a SS7 signaling link path between the EAGLE up to and including the target device.

:clli – The CLLI code or other mnemonic identifier used to describe the specified loopback point.

:rle – The remote link element to be looped back for testing.

:rep – The number of link elements of the same type, not including the target device, that lies between the EAGLE and the link element to be tested.

:lfst – The type of link fault sectionalization loopback test to be performed.

The DS0 and network element interface (NEI) link elements do not support non-latching loopbacks.

If the remote link element to be tested is a network element interface (NEI), the value of the rep parameter must be zero.

The rep parameter can only be specified for a link fault sectionalization latching loopback test.

The specified loopback point must be in the database.

The loopback point ID value cannot exceed a previously defined network element interface loopback point value.

Only one network element interface loopback point can be defined for each SS7 signaling link.

A network element interface (NEI) loopback point must be defined as the terminating SS7 signaling link component.

The value specified for the rep parameter must be greater than the value of the rep parameter assigned to the previous loopback point and less than any rep parameter values for any subsequent loopback points, if any are defined. For example, the signaling link on card 1215, link B, has 5 loopback points defined (see the rtrv-lbp command output in step 1). The value of the rep parameter used for loopback point 5 must be greater that the rep parameter value used for loopback point 3, and less than the rep parameter value used for loopback point 7.

Refer to Appendix A of Commands User's Guide for a summary of loopback testing commands and functions.

1. Display the existing loopback point values by entering the rtrv-lbp command.

   This is an example of the possible output.

   rlghncxa03w 06-10-17 16:02:05 GMT  EAGLE5 36.0.0
   LOC   LINK  LBP  RLE  REP CLLI                      LFST
   1201  A     1    DS0   0  ------------------------  LLT
               7    OCU   0  ------------------------  NLT
               9    NEI   0  ------------------------  LLT
       
   1203  B     2    DS0   0  ------------------------  LLT
               3    DS0   4  ------------------------  LLT
               4    NEI   0  ------------------------  LLT
   1204  B     3    DS0   0  ------------------------  LLT
               6    DS0   4  ------------------------  LLT
               9    NEI   0  ------------------------  LLT
   1207  B     1    DS0   0  ------------------------  LLT
               6    NEI   0  ------------------------  LLT
   1215  A     1    DS0   0  ------------------------  LLT
               3    DS0   4  ------------------------  LLT
               5    DS0   5  ------------------------  LLT
               7    DS0   8  ------------------------  LLT
               9    NEI   0  ------------------------  LLT
   

2. Change the loopback point values in the database, using the chg-lbp command.

   For this example, enter this command.

   chg-lbp:loc=1204:link=b:lbp=6:rle=csu:rep=10

   When the command has completed, this message should appear.

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

3. Verify the changes using the rtrv-lbp command.

   This is an example of the possible output.

   rlghncxa03w 06-10-17 16:02:05 GMT  EAGLE5 36.0.0
   LOC   LINK  LBP  RLE  REP CLLI                      LFST
   1201  A     1    DS0   0  ------------------------  LLT
               7    OCU   0  ------------------------  NLT
               9    NEI   0  ------------------------  LLT
       
   1203  B     2    DS0   0  ------------------------  LLT
               3    DS0   4  ------------------------  LLT
               4    NEI   0  ------------------------  LLT
   1204  B     3    DS0   0  ------------------------  LLT
               6    CSU  10  ------------------------  LLT
               9    NEI   0  ------------------------  LLT
   1207  B     1    DS0   0  ------------------------  LLT
               6    NEI   0  ------------------------  LLT
   1215  A     1    DS0   0  ------------------------  LLT
               3    DS0   4  ------------------------  LLT
               5    DS0   5  ------------------------  LLT
               7    DS0   8  ------------------------  LLT
               9    NEI   0  ------------------------  LLT
   

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 3-31 Changing Remote Loopback Points