2.4.1 Flexible Intermediate GTT Load Sharing

Flexible Intermediate GTT Load Sharing provides more flexible GTT load sharing arrangements for GTT traffic requiring intermediate global title translation (the routing indicator in the message is GT) than the load sharing arrangements provided by the Intermediate GTT Load Sharing feature. The Flexible GTT load sharing and Intermediate GTT load sharing features are enabled by default to perform Flexible Intermediate GTT Load Sharing.

Intermediate Load Sharing Feature Only

With the Intermediate GTT Load Sharing feature enabled and turned on and the load shares post-GTT destinations when intermediate GTT is being performed through the use of the MRN table. The destination point codes in the MRN table can appear in the MRN table only once. The MRN table contains groups of point codes with a maximum of 32 point codes in each group. This arrangement allows only one set of relationships to be defined between a given point code and any other point codes in the MRN group. All global title addresses in the GTT table that translate to a point code in the given MRN group will have the same set of load sharing rules applied.

For example, the following point codes and relative cost values are provisioned in the MRN table.

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

When the point code in the intermediate GTT is translated to 005-005-005, all traffic routed using the global title addresses in the global title translations containing this point code are load shared equally, no matter what the global title address is.

Note:

If you want to provision an IGT or GTT action without load sharing mode, then MRNSET is not specified.