Changing the Relative Cost Values of MRN Entries

This procedure is used to change the relative cost attributes of entries in an existing Mated Relay Node (MRN) group or MRN set using rc/rc1/rc2/rc3/ rc4 parameters of the chg-mrn command.

The chg-mrn command can also be used to add point code entries to an existing MRN group or MRN set. This action is not covered in this procedure. If you wish to add point code entries to an existing MRN group or MRN set, perform Provisioning MRN Entries .

If you wish to assign the same weight and threshold value to all the MRN entries in the MRN group or MRN set with the eswt and thr parameters, or to remove the weight and threshold values from all the MRN entries in the MRN group or MRN set with the eswt=none parameter, perform Changing MRN Entries with the ESWT Parameter. The eswt and thr parameters cannot be used in this procedure.

If you wish to change individual weight values for MRN entries with the wt/wt1/wt2/wt3/wt4 parameters, the weight values for an RC group with the grpwt parameter, the threshold values for an MRN group or MRN set with the thr parameter, or the relative cost and weight values for an MRN group or MRN set with the force=yes parameter, perform Changing the Weight and Threshold Values of MRN Entries. The wt/wt1/wt2/wt3/wt4, grpwt, thr, and force=yes parameters cannot be used in this procedure.

If you wish to change the MAP set, MAP point code, and MAP SSN values assigned to an MRN set, using the mapset, mappc/mappca/mappci/mappcn/mappcn24, and mapssn parameters, perform Changing the MAPSET, MAP Point Code, and MAP SSN Values of MRN Entries. The mapset, mappc/mappca/mappci/mappcn/mappcn24, and mapssn parameters cannot be used in this procedure.

An MRN group or MRN set contains alternate point codes, up to 32, that are used for load sharing between multiple nodes when the EAGLE is performing intermediate global title translation. This load sharing is performed after intermediate global title translation is performed on the message. The point code in the message is changed to the selected point code in the MRN table. If the translated point code is not found in the MRN table, the translated point code in the message is not changed, the message is routed using route for the translated point code.

These parameters are used with the chg-mrn command in this procedure.

:pc/pca/pci/pcn/pcn24 – The point code in the message after intermediate global title translation has been performed.

:rc – The relative cost value of point code in the message

:pc1/pca1/pci1/pcn1/pcn241 – The first alternate point code value

:rc1 – The relative cost value of the first alternate point code

:pc2/pca2/pci2/pcn2/pcn242 – The second alternate point code value

:rc2 – The relative cost value of the second alternate point code

:pc3/pca3/pci3/pcn3/pcn243 – The third alternate point code value

:rc3 – The relative cost value of the third alternate point code

:pc4/pca4/pci4/pcn4/pcn244 – The fourth alternate point code value

:rc4 – The relative cost value of the fourth alternate point code

Note:

Refer to Chapter 2, Configuring Destination Tables in Database Administration - SS7 User's Guide for a definition of the point code types that are used on the EAGLE and for a definition of the different formats that can be used for ITU national point codes.

:mrnset – The MRN set ID that the MRN is assigned to, shown in the rtrv-mrn output. MRN set IDs are shown only if the Flexible GTT Load Sharing feature is enabled. The mrnset parameter value cannot be changed in this procedure. For more information on the Flexible GTT Load Sharing feature, refer to Flexible GTT Load Sharing.

The relative cost parameter values (rc/rc1/rc2/rc3/rc4) determine how the global title translation load is to be shared among the alternate point codes. There are three types of load sharing that can be performed: dominant, load shared, or combined dominant/load shared.

All the point codes in a dominant MRN group or MRN set have different relative cost values. The translated point code in the message is the preferred point code that the message is routed on. The relative cost value assigned to the preferred point code does not have to be the lowest value in the MRN group or MRN set. All traffic is routed to the preferred point code, if it is available. If the preferred point code becomes unavailable, the traffic is routed to highest priority alternate point code that is available. When the preferred point code becomes available again, the traffic is then routed back to the preferred point code. For example, the MRN table contains the following entries.

PC             RC
   005-005-005    10
   006-001-001    20
   006-001-002    30
   006-001-003    40
   006-001-004    50
   006-001-005    60
   006-001-006    70
   006-001-007    80

If the preferred point code is 006-001-001 and it becomes unavailable, the traffic will be routed to point code 006-001-002.

All the point codes in a load shared MRN group have the same relative cost value. Traffic is shared equally between the point codes in this MRN group.

A combined dominant/load shared MRN group or MRN set is a combination of the dominant and load sharing MRN groups or MRN sets. A combined dominant/load shared MRN group or MRN set must contain a minimum of two entries with the same relative cost value and a minimum of one entry with a different relative cost value. Traffic is routed to the point code or point codes with the lowest relative cost value. If more than one point code has the lowest relative cost value, the traffic is shared between these point codes. If the point code or point codes with the lowest relative cost value become unavailable, traffic is routed to the point code or point codes with the next higher relative cost value. If more than one point code has this relative cost value, the traffic is shared between these point codes. For example, the MRN table contains the following entries.

PC             RC
   005-005-005    10
   006-001-001    10
   006-001-002    10
   006-001-003    20
   006-001-004    20
   006-001-005    20
   006-001-006    20
   006-001-007    20

If the preferred point code is 006-001-001, the traffic is shared equally between point codes 005-005-005, 006-001-001, and 006-001-002. If point codes 005-005-005, 006-001-001, and 006-001-002 become unavailable, the traffic will be shared equally between point codes, 006-001-003, 006-001-004, 006-001-005, 006-001-006, and 006-001-007.

Canceling the RTRV-MRN Command

Because the rtrv-mrn command used in this procedure can output information for a long period of time, the rtrv-mrn command can be canceled and the output to the terminal stopped. There are three ways that the rtrv-mrn command can be canceled.

Press the F9 function key on the keyboard at the terminal where the rtrv-mrn command was entered.
Enter the canc-cmd without the trm parameter at the terminal where the rtrv-mrn command was entered.
Enter the canc-cmd:trm=<xx>, where <xx> is the terminal where the rtrv-mrn command was entered, from another terminal other that the terminal where the rtrv-mrn command was entered. To enter the canc-cmd:trm=<xx> command, the terminal must allow Security Administration commands to be entered from it and the user must be allowed to enter Security Administration commands. The terminal’s permissions can be verified with the rtrv-secu-trm command. The user’s permissions can be verified with the rtrv-user or rtrv-secu-user commands.

For more information about the canc-cmd command, refer to Commands User's Guide.

Display the mated relay node groups in the database using the rtrv-mrn command. This is an example of the possible output.

rlghncxa03w 07-05-07 00:34:31 GMT EAGLE5 37.0.0

   PC             RC
   005-005-005    10
   006-001-001    20
   006-001-002    30
   006-001-003    40
   006-001-004    50
   006-001-005    60
   006-001-006    70
   006-001-007    80

   PC             RC
   007-007-007    10
   008-001-001    20
   008-001-002    30
   008-001-003    40
   008-001-004    50
   008-001-005    60
   008-001-006    70

MRN table is (15 of 5990) 1% full

If the Flexible GTT Load Sharing feature is enabled, this is an example of the possible output.

MRNSET    PC             RC
   DFLT      005-005-005    10
             006-001-001    20
             006-001-002    30
             006-001-003    40
             006-001-004    50
             006-001-005    60
             006-001-006    70
             006-001-007    80

   MRNSET    PC             RC
   1         007-007-007    10
             008-001-001    20
             008-001-002    30
             008-001-003    40
             008-001-004    50
             008-001-005    60
             008-001-006    70

MRN table is (15 of 5990) 1% full

If the Weighted GTT Load Sharing feature is enabled and turned on, and the Flexible GTT Load Sharing feature is not enabled, this is an example of the possible output.

rlghncxa03w 07-05-07 00:34:31 GMT EAGLE5 37.0.0

   PC             RC WT %WT THR
   005-005-005    10 10  50  30
   006-001-001    10 10  50  30
   006-001-002    30 20 100  30
   006-001-003    40 20 100  30
   006-001-004    50 20 100  30

   PC             RC WT %WT THR
   007-007-007    10 10  17   1
   008-001-001    10 20  33   1
   008-001-002    10 30  50   1
   008-001-003    20 20  25   1
   008-001-004    20 20  25   1
   008-001-005    20 20  25   1
   008-001-006    20 20  25   1

MRN table is (16 of 5990) 1% full

If the Weighted GTT Load Sharing feature is enabled and turned on, and the Flexible GTT Load Sharing feature is enabled, this is an example of the possible output.

rlghncxa03w 07-05-07 00:34:31 GMT EAGLE5 37.0.0

   MRNSET    PC             RC WT %WT THR
   DFLT      005-005-005    10 10  50  30
             006-001-001    10 10  50  30
             006-001-002    30 20 100  30
             006-001-003    40 20 100  30
             006-001-004    50 20 100  30

   MRNSET    PC             RC WT %WT THR
   1         007-007-007    10 10  17   1
             008-001-001    10 20  33   1
             008-001-002    10 30  50   1
             008-001-003    20 20  25   1
             008-001-004    20 20  25   1
             008-001-005    20 20  25   1
             008-001-006    20 20  25   1

MRN table is (16 of 5990) 1% full

Change the RC values in the MRN group or MRN set by entering the chg-mrn command with the point code parameters and their corresponding RC parameters rc, rc1, rc2, rc3, and rc4 parameters.
If only one RC value is being changed, specify the point code value with the pc/pca/pci/pcn/pcn24 parameter and specify the new RC value with the rc parameter. For example, enter this command to change the RC value of the point code 005-005-005 from 10 to 45.

chg-mrn:pca=005-005-005:rc=45

More than one RC value in the MRN group or MRN set can be changed with the chg-mrn command. To change more than one RC value, specify the first point code value with the pc/pca/pci/pcn/pcn24 parameter and the other point code values with the appropriate alternate point code parameters. The new RC values are specified with the rc parameters that correspond to the point code parameters. For example, enter this command to change some of the RC values in the MRN group containing these point codes: 005-005-005, 006-001-001, 006-001-003, 006-001-004, and 006-001-007.

chg-mrn:pca=007-007-007:rc=5:pca=008-001-003:rc=10:pca=008-001-004:rc=15 :pca=008-001-001:rc=35:pca=008-001-006:rc=45

If the MRNSET column is shown in the rtrv-mrn output in step 1, the mrnset=<MRN Set ID> parameter, specifying the MRN set containing the point code specified in this step, must be specified with the chg-mrn command. To change the RC values in an MRN set, for this example enter these commands.

chg-mrn:pca=005-005-005:rc=45:mrnset=dflt

chg-mrn:pca=007-007-007:rc=5:pca=008-001-003:rc=10:pca=008-001-004:rc=15 :pca=008-001-001:rc=35:pca=008-001-006:rc=45:mrnset=1

Note:
If the RC values are changed so that the resulting MRN group of MRN set becomes a dominant MRN group or MRN set (the RC values are unique), and the MRN group of MRN set had weight and in-service thresholds assigned, the weight and in-service threshold values will be removed from the MRN group of MRN set.

When the chg-mrn command has successfully completed, this message should appear.
```
rlghncxa03w 07-05-07  11:44:13  GMT  EAGLE5 37.0.0
CHG-MRN:  MASP A - COMPLTD
```
Repeat this step to change other entries in the MRN group or MRN set.

Verify the changes using the rtrv-mrn command with the point code (pca/pci/pcn/pcn24 parameters) specified in step 2. If the mrnset parameter was specified in step 2, the mrnset parameter and value specified in step 2 must be specified with the rtrv-mrn command in this step.

For this example, enter these commands.

rtrv-mrn:pca=005-005-005