The LB index is generated by the Advisor to uniquely identify a load balancer, and is used in other MODIFY commands to display details of a particular load balancer. The LB index that is assigned to the next load balancer that connects can be difficult to predict at times, in case your automation attempts to predict them. Each time a load balancer connects, it is assigned a different LB index. At first, the numbers are assigned in order from 0 to 99, and then the numbers are reused. The next number assigned after 99 is based on a least-recently-used algorithm. Thus, of the load balancer connections that used the numbers 0-99, the index of the load balancer connection that ended first would be the next number assigned as the next LB index. This is done to prevent the confusion that could result if new load balancer connections obtained the lowest available index. If that were the case, it might be difficult to ascertain whether different load balancer displays referred to the same or different load balancer connection instances. If the Advisor is brought down and back up, the indexes start from zero again. Lines 3 and 6 in Figure 1 show two LB indexes. For more information about the LB INDEX field, see z/OS Communications Server: IP System Administrator's Commands.